import { TypeORMError } from "../../error";
import { QueryFailedError } from "../../error/QueryFailedError";
import { QueryRunnerAlreadyReleasedError } from "../../error/QueryRunnerAlreadyReleasedError";
import { TransactionNotStartedError } from "../../error/TransactionNotStartedError";
import { BaseQueryRunner } from "../../query-runner/BaseQueryRunner";
import { QueryResult } from "../../query-runner/QueryResult";
import { Table } from "../../schema-builder/table/Table";
import { TableCheck } from "../../schema-builder/table/TableCheck";
import { TableColumn } from "../../schema-builder/table/TableColumn";
import { TableExclusion } from "../../schema-builder/table/TableExclusion";
import { TableForeignKey } from "../../schema-builder/table/TableForeignKey";
import { TableIndex } from "../../schema-builder/table/TableIndex";
import { TableUnique } from "../../schema-builder/table/TableUnique";
import { View } from "../../schema-builder/view/View";
import { Broadcaster } from "../../subscriber/Broadcaster";
import { BroadcasterResult } from "../../subscriber/BroadcasterResult";
import { InstanceChecker } from "../../util/InstanceChecker";
import { OrmUtils } from "../../util/OrmUtils";
import { DriverUtils } from "../DriverUtils";
import { Query } from "../Query";
import { MetadataTableType } from "../types/MetadataTableType";
/**
 * Runs queries on a single postgres database connection.
 */
export class PostgresQueryRunner extends BaseQueryRunner {
    // -------------------------------------------------------------------------
    // Constructor
    // -------------------------------------------------------------------------
    constructor(driver, mode) {
        super();
        this.driver = driver;
        this.connection = driver.connection;
        this.mode = mode;
        this.broadcaster = new Broadcaster(this);
    }
    // -------------------------------------------------------------------------
    // Public Methods
    // -------------------------------------------------------------------------
    /**
     * Creates/uses database connection from the connection pool to perform further operations.
     * Returns obtained database connection.
     */
    connect() {
        if (this.databaseConnection)
            return Promise.resolve(this.databaseConnection);
        if (this.databaseConnectionPromise)
            return this.databaseConnectionPromise;
        if (this.mode === "slave" && this.driver.isReplicated) {
            this.databaseConnectionPromise = this.driver
                .obtainSlaveConnection()
                .then(([connection, release]) => {
                this.driver.connectedQueryRunners.push(this);
                this.databaseConnection = connection;
                const onErrorCallback = (err) => this.releasePostgresConnection(err);
                this.releaseCallback = (err) => {
                    this.databaseConnection.removeListener("error", onErrorCallback);
                    release(err);
                };
                this.databaseConnection.on("error", onErrorCallback);
                return this.databaseConnection;
            });
        }
        else {
            // master
            this.databaseConnectionPromise = this.driver
                .obtainMasterConnection()
                .then(([connection, release]) => {
                this.driver.connectedQueryRunners.push(this);
                this.databaseConnection = connection;
                const onErrorCallback = (err) => this.releasePostgresConnection(err);
                this.releaseCallback = (err) => {
                    this.databaseConnection.removeListener("error", onErrorCallback);
                    release(err);
                };
                this.databaseConnection.on("error", onErrorCallback);
                return this.databaseConnection;
            });
        }
        return this.databaseConnectionPromise;
    }
    /**
     * Release a connection back to the pool, optionally specifying an Error to release with.
     * Per pg-pool documentation this will prevent the pool from re-using the broken connection.
     */
    async releasePostgresConnection(err) {
        if (this.isReleased) {
            return;
        }
        this.isReleased = true;
        if (this.releaseCallback) {
            this.releaseCallback(err);
            this.releaseCallback = undefined;
        }
        const index = this.driver.connectedQueryRunners.indexOf(this);
        if (index !== -1) {
            this.driver.connectedQueryRunners.splice(index, 1);
        }
    }
    /**
     * Releases used database connection.
     * You cannot use query runner methods once its released.
     */
    release() {
        return this.releasePostgresConnection();
    }
    /**
     * Starts transaction.
     */
    async startTransaction(isolationLevel) {
        this.isTransactionActive = true;
        try {
            await this.broadcaster.broadcast("BeforeTransactionStart");
        }
        catch (err) {
            this.isTransactionActive = false;
            throw err;
        }
        if (this.transactionDepth === 0) {
            await this.query("START TRANSACTION");
            if (isolationLevel) {
                await this.query("SET TRANSACTION ISOLATION LEVEL " + isolationLevel);
            }
        }
        else {
            await this.query(`SAVEPOINT typeorm_${this.transactionDepth}`);
        }
        this.transactionDepth += 1;
        await this.broadcaster.broadcast("AfterTransactionStart");
    }
    /**
     * Commits transaction.
     * Error will be thrown if transaction was not started.
     */
    async commitTransaction() {
        if (!this.isTransactionActive)
            throw new TransactionNotStartedError();
        await this.broadcaster.broadcast("BeforeTransactionCommit");
        if (this.transactionDepth > 1) {
            await this.query(`RELEASE SAVEPOINT typeorm_${this.transactionDepth - 1}`);
        }
        else {
            await this.query("COMMIT");
            this.isTransactionActive = false;
        }
        this.transactionDepth -= 1;
        await this.broadcaster.broadcast("AfterTransactionCommit");
    }
    /**
     * Rollbacks transaction.
     * Error will be thrown if transaction was not started.
     */
    async rollbackTransaction() {
        if (!this.isTransactionActive)
            throw new TransactionNotStartedError();
        await this.broadcaster.broadcast("BeforeTransactionRollback");
        if (this.transactionDepth > 1) {
            await this.query(`ROLLBACK TO SAVEPOINT typeorm_${this.transactionDepth - 1}`);
        }
        else {
            await this.query("ROLLBACK");
            this.isTransactionActive = false;
        }
        this.transactionDepth -= 1;
        await this.broadcaster.broadcast("AfterTransactionRollback");
    }
    /**
     * Executes a given SQL query.
     */
    async query(query, parameters, useStructuredResult = false) {
        if (this.isReleased)
            throw new QueryRunnerAlreadyReleasedError();
        const databaseConnection = await this.connect();
        this.driver.connection.logger.logQuery(query, parameters, this);
        await this.broadcaster.broadcast("BeforeQuery", query, parameters);
        const broadcasterResult = new BroadcasterResult();
        try {
            const queryStartTime = Date.now();
            const raw = await databaseConnection.query(query, parameters);
            // log slow queries if maxQueryExecution time is set
            const maxQueryExecutionTime = this.driver.options.maxQueryExecutionTime;
            const queryEndTime = Date.now();
            const queryExecutionTime = queryEndTime - queryStartTime;
            this.broadcaster.broadcastAfterQueryEvent(broadcasterResult, query, parameters, true, queryExecutionTime, raw, undefined);
            if (maxQueryExecutionTime &&
                queryExecutionTime > maxQueryExecutionTime)
                this.driver.connection.logger.logQuerySlow(queryExecutionTime, query, parameters, this);
            const result = new QueryResult();
            if (raw) {
                if (raw.hasOwnProperty("rows")) {
                    result.records = raw.rows;
                }
                if (raw.hasOwnProperty("rowCount")) {
                    result.affected = raw.rowCount;
                }
                switch (raw.command) {
                    case "DELETE":
                    case "UPDATE":
                        // for UPDATE and DELETE query additionally return number of affected rows
                        result.raw = [raw.rows, raw.rowCount];
                        break;
                    default:
                        result.raw = raw.rows;
                }
                if (!useStructuredResult) {
                    return result.raw;
                }
            }
            return result;
        }
        catch (err) {
            this.driver.connection.logger.logQueryError(err, query, parameters, this);
            this.broadcaster.broadcastAfterQueryEvent(broadcasterResult, query, parameters, false, undefined, undefined, err);
            throw new QueryFailedError(query, parameters, err);
        }
        finally {
            await broadcasterResult.wait();
        }
    }
    /**
     * Returns raw data stream.
     */
    async stream(query, parameters, onEnd, onError) {
        const QueryStream = this.driver.loadStreamDependency();
        if (this.isReleased)
            throw new QueryRunnerAlreadyReleasedError();
        const databaseConnection = await this.connect();
        this.driver.connection.logger.logQuery(query, parameters, this);
        const stream = databaseConnection.query(new QueryStream(query, parameters));
        if (onEnd)
            stream.on("end", onEnd);
        if (onError)
            stream.on("error", onError);
        return stream;
    }
    /**
     * Returns all available database names including system databases.
     */
    async getDatabases() {
        return Promise.resolve([]);
    }
    /**
     * Returns all available schema names including system schemas.
     * If database parameter specified, returns schemas of that database.
     */
    async getSchemas(database) {
        return Promise.resolve([]);
    }
    /**
     * Checks if database with the given name exist.
     */
    async hasDatabase(database) {
        const result = await this.query(`SELECT * FROM pg_database WHERE datname='${database}';`);
        return result.length ? true : false;
    }
    /**
     * Loads currently using database
     */
    async getCurrentDatabase() {
        const query = await this.query(`SELECT * FROM current_database()`);
        return query[0]["current_database"];
    }
    /**
     * Checks if schema with the given name exist.
     */
    async hasSchema(schema) {
        const result = await this.query(`SELECT * FROM "information_schema"."schemata" WHERE "schema_name" = '${schema}'`);
        return result.length ? true : false;
    }
    /**
     * Loads currently using database schema
     */
    async getCurrentSchema() {
        const query = await this.query(`SELECT * FROM current_schema()`);
        return query[0]["current_schema"];
    }
    /**
     * Checks if table with the given name exist in the database.
     */
    async hasTable(tableOrName) {
        const parsedTableName = this.driver.parseTableName(tableOrName);
        if (!parsedTableName.schema) {
            parsedTableName.schema = await this.getCurrentSchema();
        }
        const sql = `SELECT * FROM "information_schema"."tables" WHERE "table_schema" = '${parsedTableName.schema}' AND "table_name" = '${parsedTableName.tableName}'`;
        const result = await this.query(sql);
        return result.length ? true : false;
    }
    /**
     * Checks if column with the given name exist in the given table.
     */
    async hasColumn(tableOrName, columnName) {
        const parsedTableName = this.driver.parseTableName(tableOrName);
        if (!parsedTableName.schema) {
            parsedTableName.schema = await this.getCurrentSchema();
        }
        const sql = `SELECT * FROM "information_schema"."columns" WHERE "table_schema" = '${parsedTableName.schema}' AND "table_name" = '${parsedTableName.tableName}' AND "column_name" = '${columnName}'`;
        const result = await this.query(sql);
        return result.length ? true : false;
    }
    /**
     * Creates a new database.
     * Note: Postgres does not support database creation inside a transaction block.
     */
    async createDatabase(database, ifNotExist) {
        if (ifNotExist) {
            const databaseAlreadyExists = await this.hasDatabase(database);
            if (databaseAlreadyExists)
                return Promise.resolve();
        }
        const up = `CREATE DATABASE "${database}"`;
        const down = `DROP DATABASE "${database}"`;
        await this.executeQueries(new Query(up), new Query(down));
    }
    /**
     * Drops database.
     * Note: Postgres does not support database dropping inside a transaction block.
     */
    async dropDatabase(database, ifExist) {
        const up = ifExist
            ? `DROP DATABASE IF EXISTS "${database}"`
            : `DROP DATABASE "${database}"`;
        const down = `CREATE DATABASE "${database}"`;
        await this.executeQueries(new Query(up), new Query(down));
    }
    /**
     * Creates a new table schema.
     */
    async createSchema(schemaPath, ifNotExist) {
        const schema = schemaPath.indexOf(".") === -1
            ? schemaPath
            : schemaPath.split(".")[1];
        const up = ifNotExist
            ? `CREATE SCHEMA IF NOT EXISTS "${schema}"`
            : `CREATE SCHEMA "${schema}"`;
        const down = `DROP SCHEMA "${schema}" CASCADE`;
        await this.executeQueries(new Query(up), new Query(down));
    }
    /**
     * Drops table schema.
     */
    async dropSchema(schemaPath, ifExist, isCascade) {
        const schema = schemaPath.indexOf(".") === -1
            ? schemaPath
            : schemaPath.split(".")[1];
        const up = ifExist
            ? `DROP SCHEMA IF EXISTS "${schema}" ${isCascade ? "CASCADE" : ""}`
            : `DROP SCHEMA "${schema}" ${isCascade ? "CASCADE" : ""}`;
        const down = `CREATE SCHEMA "${schema}"`;
        await this.executeQueries(new Query(up), new Query(down));
    }
    /**
     * Creates a new table.
     */
    async createTable(table, ifNotExist = false, createForeignKeys = true, createIndices = true) {
        if (ifNotExist) {
            const isTableExist = await this.hasTable(table);
            if (isTableExist)
                return Promise.resolve();
        }
        const upQueries = [];
        const downQueries = [];
        // if table have column with ENUM type, we must create this type in postgres.
        const enumColumns = table.columns.filter((column) => column.type === "enum" || column.type === "simple-enum");
        const createdEnumTypes = [];
        for (const column of enumColumns) {
            // TODO: Should also check if values of existing type matches expected ones
            const hasEnum = await this.hasEnumType(table, column);
            const enumName = this.buildEnumName(table, column);
            // if enum with the same "enumName" is defined more then once, me must prevent double creation
            if (!hasEnum && createdEnumTypes.indexOf(enumName) === -1) {
                createdEnumTypes.push(enumName);
                upQueries.push(this.createEnumTypeSql(table, column, enumName));
                downQueries.push(this.dropEnumTypeSql(table, column, enumName));
            }
        }
        // if table have column with generated type, we must add the expression to the metadata table
        const generatedColumns = table.columns.filter((column) => column.generatedType === "STORED" && column.asExpression);
        for (const column of generatedColumns) {
            const tableNameWithSchema = (await this.getTableNameWithSchema(table.name)).split(".");
            const tableName = tableNameWithSchema[1];
            const schema = tableNameWithSchema[0];
            const insertQuery = this.insertTypeormMetadataSql({
                database: this.driver.database,
                schema,
                table: tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            const deleteQuery = this.deleteTypeormMetadataSql({
                database: this.driver.database,
                schema,
                table: tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            upQueries.push(insertQuery);
            downQueries.push(deleteQuery);
        }
        upQueries.push(this.createTableSql(table, createForeignKeys));
        downQueries.push(this.dropTableSql(table));
        // if createForeignKeys is true, we must drop created foreign keys in down query.
        // createTable does not need separate method to create foreign keys, because it create fk's in the same query with table creation.
        if (createForeignKeys)
            table.foreignKeys.forEach((foreignKey) => downQueries.push(this.dropForeignKeySql(table, foreignKey)));
        if (createIndices) {
            table.indices.forEach((index) => {
                // new index may be passed without name. In this case we generate index name manually.
                if (!index.name)
                    index.name = this.connection.namingStrategy.indexName(table, index.columnNames, index.where);
                upQueries.push(this.createIndexSql(table, index));
                downQueries.push(this.dropIndexSql(table, index));
            });
        }
        if (table.comment) {
            upQueries.push(new Query("COMMENT ON TABLE " +
                this.escapePath(table) +
                " IS '" +
                table.comment +
                "'"));
            downQueries.push(new Query("COMMENT ON TABLE " + this.escapePath(table) + " IS NULL"));
        }
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Drops the table.
     */
    async dropTable(target, ifExist, dropForeignKeys = true, dropIndices = true) {
        // It needs because if table does not exist and dropForeignKeys or dropIndices is true, we don't need
        // to perform drop queries for foreign keys and indices.
        if (ifExist) {
            const isTableExist = await this.hasTable(target);
            if (!isTableExist)
                return Promise.resolve();
        }
        // if dropTable called with dropForeignKeys = true, we must create foreign keys in down query.
        const createForeignKeys = dropForeignKeys;
        const tablePath = this.getTablePath(target);
        const table = await this.getCachedTable(tablePath);
        const upQueries = [];
        const downQueries = [];
        if (dropIndices) {
            table.indices.forEach((index) => {
                upQueries.push(this.dropIndexSql(table, index));
                downQueries.push(this.createIndexSql(table, index));
            });
        }
        if (dropForeignKeys)
            table.foreignKeys.forEach((foreignKey) => upQueries.push(this.dropForeignKeySql(table, foreignKey)));
        upQueries.push(this.dropTableSql(table));
        downQueries.push(this.createTableSql(table, createForeignKeys));
        // if table had columns with generated type, we must remove the expression from the metadata table
        const generatedColumns = table.columns.filter((column) => column.generatedType && column.asExpression);
        for (const column of generatedColumns) {
            const tableNameWithSchema = (await this.getTableNameWithSchema(table.name)).split(".");
            const tableName = tableNameWithSchema[1];
            const schema = tableNameWithSchema[0];
            const deleteQuery = this.deleteTypeormMetadataSql({
                database: this.driver.database,
                schema,
                table: tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            const insertQuery = this.insertTypeormMetadataSql({
                database: this.driver.database,
                schema,
                table: tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            upQueries.push(deleteQuery);
            downQueries.push(insertQuery);
        }
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Creates a new view.
     */
    async createView(view, syncWithMetadata = false) {
        const upQueries = [];
        const downQueries = [];
        upQueries.push(this.createViewSql(view));
        if (syncWithMetadata)
            upQueries.push(await this.insertViewDefinitionSql(view));
        downQueries.push(this.dropViewSql(view));
        if (syncWithMetadata)
            downQueries.push(await this.deleteViewDefinitionSql(view));
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Drops the view.
     */
    async dropView(target) {
        const viewName = InstanceChecker.isView(target) ? target.name : target;
        const view = await this.getCachedView(viewName);
        const upQueries = [];
        const downQueries = [];
        upQueries.push(await this.deleteViewDefinitionSql(view));
        upQueries.push(this.dropViewSql(view));
        downQueries.push(await this.insertViewDefinitionSql(view));
        downQueries.push(this.createViewSql(view));
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Renames the given table.
     */
    async renameTable(oldTableOrName, newTableName) {
        const upQueries = [];
        const downQueries = [];
        const oldTable = InstanceChecker.isTable(oldTableOrName)
            ? oldTableOrName
            : await this.getCachedTable(oldTableOrName);
        const newTable = oldTable.clone();
        const { schema: schemaName, tableName: oldTableName } = this.driver.parseTableName(oldTable);
        newTable.name = schemaName
            ? `${schemaName}.${newTableName}`
            : newTableName;
        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(oldTable)} RENAME TO "${newTableName}"`));
        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(newTable)} RENAME TO "${oldTableName}"`));
        // rename column primary key constraint if it has default constraint name
        if (newTable.primaryColumns.length > 0 &&
            !newTable.primaryColumns[0].primaryKeyConstraintName) {
            const columnNames = newTable.primaryColumns.map((column) => column.name);
            const oldPkName = this.connection.namingStrategy.primaryKeyName(oldTable, columnNames);
            const newPkName = this.connection.namingStrategy.primaryKeyName(newTable, columnNames);
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(newTable)} RENAME CONSTRAINT "${oldPkName}" TO "${newPkName}"`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(newTable)} RENAME CONSTRAINT "${newPkName}" TO "${oldPkName}"`));
        }
        // rename sequences
        newTable.columns.map((col) => {
            if (col.isGenerated && col.generationStrategy === "increment") {
                const sequencePath = this.buildSequencePath(oldTable, col.name);
                const sequenceName = this.buildSequenceName(oldTable, col.name);
                const newSequencePath = this.buildSequencePath(newTable, col.name);
                const newSequenceName = this.buildSequenceName(newTable, col.name);
                const up = `ALTER SEQUENCE ${this.escapePath(sequencePath)} RENAME TO "${newSequenceName}"`;
                const down = `ALTER SEQUENCE ${this.escapePath(newSequencePath)} RENAME TO "${sequenceName}"`;
                upQueries.push(new Query(up));
                downQueries.push(new Query(down));
            }
        });
        // rename unique constraints
        newTable.uniques.forEach((unique) => {
            const oldUniqueName = this.connection.namingStrategy.uniqueConstraintName(oldTable, unique.columnNames);
            // Skip renaming if Unique has user defined constraint name
            if (unique.name !== oldUniqueName)
                return;
            // build new constraint name
            const newUniqueName = this.connection.namingStrategy.uniqueConstraintName(newTable, unique.columnNames);
            // build queries
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(newTable)} RENAME CONSTRAINT "${unique.name}" TO "${newUniqueName}"`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(newTable)} RENAME CONSTRAINT "${newUniqueName}" TO "${unique.name}"`));
            // replace constraint name
            unique.name = newUniqueName;
        });
        // rename index constraints
        newTable.indices.forEach((index) => {
            const oldIndexName = this.connection.namingStrategy.indexName(oldTable, index.columnNames, index.where);
            // Skip renaming if Index has user defined constraint name
            if (index.name !== oldIndexName)
                return;
            // build new constraint name
            const { schema } = this.driver.parseTableName(newTable);
            const newIndexName = this.connection.namingStrategy.indexName(newTable, index.columnNames, index.where);
            // build queries
            const up = schema
                ? `ALTER INDEX "${schema}"."${index.name}" RENAME TO "${newIndexName}"`
                : `ALTER INDEX "${index.name}" RENAME TO "${newIndexName}"`;
            const down = schema
                ? `ALTER INDEX "${schema}"."${newIndexName}" RENAME TO "${index.name}"`
                : `ALTER INDEX "${newIndexName}" RENAME TO "${index.name}"`;
            upQueries.push(new Query(up));
            downQueries.push(new Query(down));
            // replace constraint name
            index.name = newIndexName;
        });
        // rename foreign key constraints
        newTable.foreignKeys.forEach((foreignKey) => {
            const oldForeignKeyName = this.connection.namingStrategy.foreignKeyName(oldTable, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
            // Skip renaming if foreign key has user defined constraint name
            if (foreignKey.name !== oldForeignKeyName)
                return;
            // build new constraint name
            const newForeignKeyName = this.connection.namingStrategy.foreignKeyName(newTable, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
            // build queries
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(newTable)} RENAME CONSTRAINT "${foreignKey.name}" TO "${newForeignKeyName}"`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(newTable)} RENAME CONSTRAINT "${newForeignKeyName}" TO "${foreignKey.name}"`));
            // replace constraint name
            foreignKey.name = newForeignKeyName;
        });
        // rename ENUM types
        const enumColumns = newTable.columns.filter((column) => column.type === "enum" || column.type === "simple-enum");
        for (const column of enumColumns) {
            // skip renaming for user-defined enum name
            if (column.enumName)
                continue;
            const oldEnumType = await this.getUserDefinedTypeName(oldTable, column);
            upQueries.push(new Query(`ALTER TYPE "${oldEnumType.schema}"."${oldEnumType.name}" RENAME TO ${this.buildEnumName(newTable, column, false)}`));
            downQueries.push(new Query(`ALTER TYPE ${this.buildEnumName(newTable, column)} RENAME TO "${oldEnumType.name}"`));
        }
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Creates a new column from the column in the table.
     */
    async addColumn(tableOrName, column) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const clonedTable = table.clone();
        const upQueries = [];
        const downQueries = [];
        if (column.type === "enum" || column.type === "simple-enum") {
            const hasEnum = await this.hasEnumType(table, column);
            if (!hasEnum) {
                upQueries.push(this.createEnumTypeSql(table, column));
                downQueries.push(this.dropEnumTypeSql(table, column));
            }
        }
        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD ${this.buildCreateColumnSql(table, column)}`));
        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP COLUMN "${column.name}"`));
        // create or update primary key constraint
        if (column.isPrimary) {
            const primaryColumns = clonedTable.primaryColumns;
            // if table already have primary key, me must drop it and recreate again
            if (primaryColumns.length > 0) {
                const pkName = primaryColumns[0].primaryKeyConstraintName
                    ? primaryColumns[0].primaryKeyConstraintName
                    : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
                const columnNames = primaryColumns
                    .map((column) => `"${column.name}"`)
                    .join(", ");
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
            }
            primaryColumns.push(column);
            const pkName = primaryColumns[0].primaryKeyConstraintName
                ? primaryColumns[0].primaryKeyConstraintName
                : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
            const columnNames = primaryColumns
                .map((column) => `"${column.name}"`)
                .join(", ");
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
        }
        // create column index
        const columnIndex = clonedTable.indices.find((index) => index.columnNames.length === 1 &&
            index.columnNames[0] === column.name);
        if (columnIndex) {
            upQueries.push(this.createIndexSql(table, columnIndex));
            downQueries.push(this.dropIndexSql(table, columnIndex));
        }
        // create unique constraint
        if (column.isUnique) {
            const uniqueConstraint = new TableUnique({
                name: this.connection.namingStrategy.uniqueConstraintName(table, [column.name]),
                columnNames: [column.name],
            });
            clonedTable.uniques.push(uniqueConstraint);
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${uniqueConstraint.name}" UNIQUE ("${column.name}")`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${uniqueConstraint.name}"`));
        }
        if (column.generatedType === "STORED" && column.asExpression) {
            const tableNameWithSchema = (await this.getTableNameWithSchema(table.name)).split(".");
            const tableName = tableNameWithSchema[1];
            const schema = tableNameWithSchema[0];
            const insertQuery = this.insertTypeormMetadataSql({
                database: this.driver.database,
                schema,
                table: tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            const deleteQuery = this.deleteTypeormMetadataSql({
                database: this.driver.database,
                schema,
                table: tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            upQueries.push(insertQuery);
            downQueries.push(deleteQuery);
        }
        // create column's comment
        if (column.comment) {
            upQueries.push(new Query(`COMMENT ON COLUMN ${this.escapePath(table)}."${column.name}" IS ${this.escapeComment(column.comment)}`));
            downQueries.push(new Query(`COMMENT ON COLUMN ${this.escapePath(table)}."${column.name}" IS ${this.escapeComment(column.comment)}`));
        }
        await this.executeQueries(upQueries, downQueries);
        clonedTable.addColumn(column);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Creates a new columns from the column in the table.
     */
    async addColumns(tableOrName, columns) {
        for (const column of columns) {
            await this.addColumn(tableOrName, column);
        }
    }
    /**
     * Renames column in the given table.
     */
    async renameColumn(tableOrName, oldTableColumnOrName, newTableColumnOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const oldColumn = InstanceChecker.isTableColumn(oldTableColumnOrName)
            ? oldTableColumnOrName
            : table.columns.find((c) => c.name === oldTableColumnOrName);
        if (!oldColumn)
            throw new TypeORMError(`Column "${oldTableColumnOrName}" was not found in the "${table.name}" table.`);
        let newColumn;
        if (InstanceChecker.isTableColumn(newTableColumnOrName)) {
            newColumn = newTableColumnOrName;
        }
        else {
            newColumn = oldColumn.clone();
            newColumn.name = newTableColumnOrName;
        }
        return this.changeColumn(table, oldColumn, newColumn);
    }
    /**
     * Changes a column in the table.
     */
    async changeColumn(tableOrName, oldTableColumnOrName, newColumn) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        let clonedTable = table.clone();
        const upQueries = [];
        const downQueries = [];
        let defaultValueChanged = false;
        const oldColumn = InstanceChecker.isTableColumn(oldTableColumnOrName)
            ? oldTableColumnOrName
            : table.columns.find((column) => column.name === oldTableColumnOrName);
        if (!oldColumn)
            throw new TypeORMError(`Column "${oldTableColumnOrName}" was not found in the "${table.name}" table.`);
        if (oldColumn.type !== newColumn.type ||
            oldColumn.length !== newColumn.length ||
            newColumn.isArray !== oldColumn.isArray ||
            (!oldColumn.generatedType &&
                newColumn.generatedType === "STORED") ||
            (oldColumn.asExpression !== newColumn.asExpression &&
                newColumn.generatedType === "STORED")) {
            // To avoid data conversion, we just recreate column
            await this.dropColumn(table, oldColumn);
            await this.addColumn(table, newColumn);
            // update cloned table
            clonedTable = table.clone();
        }
        else {
            if (oldColumn.name !== newColumn.name) {
                // rename column
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} RENAME COLUMN "${oldColumn.name}" TO "${newColumn.name}"`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} RENAME COLUMN "${newColumn.name}" TO "${oldColumn.name}"`));
                // rename ENUM type
                if (oldColumn.type === "enum" ||
                    oldColumn.type === "simple-enum") {
                    const oldEnumType = await this.getUserDefinedTypeName(table, oldColumn);
                    upQueries.push(new Query(`ALTER TYPE "${oldEnumType.schema}"."${oldEnumType.name}" RENAME TO ${this.buildEnumName(table, newColumn, false)}`));
                    downQueries.push(new Query(`ALTER TYPE ${this.buildEnumName(table, newColumn)} RENAME TO "${oldEnumType.name}"`));
                }
                // rename column primary key constraint
                if (oldColumn.isPrimary === true &&
                    !oldColumn.primaryKeyConstraintName) {
                    const primaryColumns = clonedTable.primaryColumns;
                    // build old primary constraint name
                    const columnNames = primaryColumns.map((column) => column.name);
                    const oldPkName = this.connection.namingStrategy.primaryKeyName(clonedTable, columnNames);
                    // replace old column name with new column name
                    columnNames.splice(columnNames.indexOf(oldColumn.name), 1);
                    columnNames.push(newColumn.name);
                    // build new primary constraint name
                    const newPkName = this.connection.namingStrategy.primaryKeyName(clonedTable, columnNames);
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} RENAME CONSTRAINT "${oldPkName}" TO "${newPkName}"`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} RENAME CONSTRAINT "${newPkName}" TO "${oldPkName}"`));
                }
                // rename column sequence
                if (oldColumn.isGenerated === true &&
                    newColumn.generationStrategy === "increment") {
                    const sequencePath = this.buildSequencePath(table, oldColumn.name);
                    const sequenceName = this.buildSequenceName(table, oldColumn.name);
                    const newSequencePath = this.buildSequencePath(table, newColumn.name);
                    const newSequenceName = this.buildSequenceName(table, newColumn.name);
                    const up = `ALTER SEQUENCE ${this.escapePath(sequencePath)} RENAME TO "${newSequenceName}"`;
                    const down = `ALTER SEQUENCE ${this.escapePath(newSequencePath)} RENAME TO "${sequenceName}"`;
                    upQueries.push(new Query(up));
                    downQueries.push(new Query(down));
                }
                // rename unique constraints
                clonedTable.findColumnUniques(oldColumn).forEach((unique) => {
                    const oldUniqueName = this.connection.namingStrategy.uniqueConstraintName(clonedTable, unique.columnNames);
                    // Skip renaming if Unique has user defined constraint name
                    if (unique.name !== oldUniqueName)
                        return;
                    // build new constraint name
                    unique.columnNames.splice(unique.columnNames.indexOf(oldColumn.name), 1);
                    unique.columnNames.push(newColumn.name);
                    const newUniqueName = this.connection.namingStrategy.uniqueConstraintName(clonedTable, unique.columnNames);
                    // build queries
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} RENAME CONSTRAINT "${unique.name}" TO "${newUniqueName}"`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} RENAME CONSTRAINT "${newUniqueName}" TO "${unique.name}"`));
                    // replace constraint name
                    unique.name = newUniqueName;
                });
                // rename index constraints
                clonedTable.findColumnIndices(oldColumn).forEach((index) => {
                    const oldIndexName = this.connection.namingStrategy.indexName(clonedTable, index.columnNames, index.where);
                    // Skip renaming if Index has user defined constraint name
                    if (index.name !== oldIndexName)
                        return;
                    // build new constraint name
                    index.columnNames.splice(index.columnNames.indexOf(oldColumn.name), 1);
                    index.columnNames.push(newColumn.name);
                    const { schema } = this.driver.parseTableName(table);
                    const newIndexName = this.connection.namingStrategy.indexName(clonedTable, index.columnNames, index.where);
                    // build queries
                    const up = schema
                        ? `ALTER INDEX "${schema}"."${index.name}" RENAME TO "${newIndexName}"`
                        : `ALTER INDEX "${index.name}" RENAME TO "${newIndexName}"`;
                    const down = schema
                        ? `ALTER INDEX "${schema}"."${newIndexName}" RENAME TO "${index.name}"`
                        : `ALTER INDEX "${newIndexName}" RENAME TO "${index.name}"`;
                    upQueries.push(new Query(up));
                    downQueries.push(new Query(down));
                    // replace constraint name
                    index.name = newIndexName;
                });
                // rename foreign key constraints
                clonedTable
                    .findColumnForeignKeys(oldColumn)
                    .forEach((foreignKey) => {
                    const foreignKeyName = this.connection.namingStrategy.foreignKeyName(clonedTable, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
                    // Skip renaming if foreign key has user defined constraint name
                    if (foreignKey.name !== foreignKeyName)
                        return;
                    // build new constraint name
                    foreignKey.columnNames.splice(foreignKey.columnNames.indexOf(oldColumn.name), 1);
                    foreignKey.columnNames.push(newColumn.name);
                    const newForeignKeyName = this.connection.namingStrategy.foreignKeyName(clonedTable, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
                    // build queries
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} RENAME CONSTRAINT "${foreignKey.name}" TO "${newForeignKeyName}"`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} RENAME CONSTRAINT "${newForeignKeyName}" TO "${foreignKey.name}"`));
                    // replace constraint name
                    foreignKey.name = newForeignKeyName;
                });
                // rename old column in the Table object
                const oldTableColumn = clonedTable.columns.find((column) => column.name === oldColumn.name);
                clonedTable.columns[clonedTable.columns.indexOf(oldTableColumn)].name = newColumn.name;
                oldColumn.name = newColumn.name;
            }
            if (newColumn.precision !== oldColumn.precision ||
                newColumn.scale !== oldColumn.scale) {
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" TYPE ${this.driver.createFullType(newColumn)}`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" TYPE ${this.driver.createFullType(oldColumn)}`));
            }
            if ((newColumn.type === "enum" ||
                newColumn.type === "simple-enum") &&
                (oldColumn.type === "enum" ||
                    oldColumn.type === "simple-enum") &&
                (!OrmUtils.isArraysEqual(newColumn.enum, oldColumn.enum) ||
                    newColumn.enumName !== oldColumn.enumName)) {
                const arraySuffix = newColumn.isArray ? "[]" : "";
                // "public"."new_enum"
                const newEnumName = this.buildEnumName(table, newColumn);
                // "public"."old_enum"
                const oldEnumName = this.buildEnumName(table, oldColumn);
                // "old_enum"
                const oldEnumNameWithoutSchema = this.buildEnumName(table, oldColumn, false);
                //"public"."old_enum_old"
                const oldEnumNameWithSchema_old = this.buildEnumName(table, oldColumn, true, false, true);
                //"old_enum_old"
                const oldEnumNameWithoutSchema_old = this.buildEnumName(table, oldColumn, false, false, true);
                // rename old ENUM
                upQueries.push(new Query(`ALTER TYPE ${oldEnumName} RENAME TO ${oldEnumNameWithoutSchema_old}`));
                downQueries.push(new Query(`ALTER TYPE ${oldEnumNameWithSchema_old} RENAME TO ${oldEnumNameWithoutSchema}`));
                // create new ENUM
                upQueries.push(this.createEnumTypeSql(table, newColumn, newEnumName));
                downQueries.push(this.dropEnumTypeSql(table, newColumn, newEnumName));
                // if column have default value, we must drop it to avoid issues with type casting
                if (oldColumn.default !== null &&
                    oldColumn.default !== undefined) {
                    // mark default as changed to prevent double update
                    defaultValueChanged = true;
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${oldColumn.name}" DROP DEFAULT`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${oldColumn.name}" SET DEFAULT ${oldColumn.default}`));
                }
                // build column types
                const upType = `${newEnumName}${arraySuffix} USING "${newColumn.name}"::"text"::${newEnumName}${arraySuffix}`;
                const downType = `${oldEnumNameWithSchema_old}${arraySuffix} USING "${newColumn.name}"::"text"::${oldEnumNameWithSchema_old}${arraySuffix}`;
                // update column to use new type
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" TYPE ${upType}`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" TYPE ${downType}`));
                // restore column default or create new one
                if (newColumn.default !== null &&
                    newColumn.default !== undefined) {
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" SET DEFAULT ${newColumn.default}`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" DROP DEFAULT`));
                }
                // remove old ENUM
                upQueries.push(this.dropEnumTypeSql(table, oldColumn, oldEnumNameWithSchema_old));
                downQueries.push(this.createEnumTypeSql(table, oldColumn, oldEnumNameWithSchema_old));
            }
            if (oldColumn.isNullable !== newColumn.isNullable) {
                if (newColumn.isNullable) {
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${oldColumn.name}" DROP NOT NULL`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${oldColumn.name}" SET NOT NULL`));
                }
                else {
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${oldColumn.name}" SET NOT NULL`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${oldColumn.name}" DROP NOT NULL`));
                }
            }
            if (oldColumn.comment !== newColumn.comment) {
                upQueries.push(new Query(`COMMENT ON COLUMN ${this.escapePath(table)}."${oldColumn.name}" IS ${this.escapeComment(newColumn.comment)}`));
                downQueries.push(new Query(`COMMENT ON COLUMN ${this.escapePath(table)}."${newColumn.name}" IS ${this.escapeComment(oldColumn.comment)}`));
            }
            if (newColumn.isPrimary !== oldColumn.isPrimary) {
                const primaryColumns = clonedTable.primaryColumns;
                // if primary column state changed, we must always drop existed constraint.
                if (primaryColumns.length > 0) {
                    const pkName = primaryColumns[0].primaryKeyConstraintName
                        ? primaryColumns[0].primaryKeyConstraintName
                        : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
                    const columnNames = primaryColumns
                        .map((column) => `"${column.name}"`)
                        .join(", ");
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
                }
                if (newColumn.isPrimary === true) {
                    primaryColumns.push(newColumn);
                    // update column in table
                    const column = clonedTable.columns.find((column) => column.name === newColumn.name);
                    column.isPrimary = true;
                    const pkName = primaryColumns[0].primaryKeyConstraintName
                        ? primaryColumns[0].primaryKeyConstraintName
                        : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
                    const columnNames = primaryColumns
                        .map((column) => `"${column.name}"`)
                        .join(", ");
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
                }
                else {
                    const primaryColumn = primaryColumns.find((c) => c.name === newColumn.name);
                    primaryColumns.splice(primaryColumns.indexOf(primaryColumn), 1);
                    // update column in table
                    const column = clonedTable.columns.find((column) => column.name === newColumn.name);
                    column.isPrimary = false;
                    // if we have another primary keys, we must recreate constraint.
                    if (primaryColumns.length > 0) {
                        const pkName = primaryColumns[0]
                            .primaryKeyConstraintName
                            ? primaryColumns[0].primaryKeyConstraintName
                            : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
                        const columnNames = primaryColumns
                            .map((column) => `"${column.name}"`)
                            .join(", ");
                        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
                        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
                    }
                }
            }
            if (newColumn.isUnique !== oldColumn.isUnique) {
                if (newColumn.isUnique === true) {
                    const uniqueConstraint = new TableUnique({
                        name: this.connection.namingStrategy.uniqueConstraintName(table, [newColumn.name]),
                        columnNames: [newColumn.name],
                    });
                    clonedTable.uniques.push(uniqueConstraint);
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${uniqueConstraint.name}" UNIQUE ("${newColumn.name}")`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${uniqueConstraint.name}"`));
                }
                else {
                    const uniqueConstraint = clonedTable.uniques.find((unique) => {
                        return (unique.columnNames.length === 1 &&
                            !!unique.columnNames.find((columnName) => columnName === newColumn.name));
                    });
                    clonedTable.uniques.splice(clonedTable.uniques.indexOf(uniqueConstraint), 1);
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${uniqueConstraint.name}"`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${uniqueConstraint.name}" UNIQUE ("${newColumn.name}")`));
                }
            }
            if (oldColumn.isGenerated !== newColumn.isGenerated) {
                // if old column was "generated", we should clear defaults
                if (oldColumn.isGenerated) {
                    if (oldColumn.generationStrategy === "uuid") {
                        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${oldColumn.name}" DROP DEFAULT`));
                        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${oldColumn.name}" SET DEFAULT ${this.driver.uuidGenerator}`));
                    }
                    else if (oldColumn.generationStrategy === "increment") {
                        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" DROP DEFAULT`));
                        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" SET DEFAULT nextval('${this.escapePath(this.buildSequencePath(table, newColumn))}')`));
                        upQueries.push(new Query(`DROP SEQUENCE ${this.escapePath(this.buildSequencePath(table, newColumn))}`));
                        downQueries.push(new Query(`CREATE SEQUENCE IF NOT EXISTS ${this.escapePath(this.buildSequencePath(table, newColumn))} OWNED BY ${this.escapePath(table)}."${newColumn.name}"`));
                    }
                }
                if (newColumn.generationStrategy === "uuid") {
                    if (newColumn.isGenerated === true) {
                        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" SET DEFAULT ${this.driver.uuidGenerator}`));
                        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" DROP DEFAULT`));
                    }
                    else {
                        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" DROP DEFAULT`));
                        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" SET DEFAULT ${this.driver.uuidGenerator}`));
                    }
                }
                else if (newColumn.generationStrategy === "increment") {
                    if (newColumn.isGenerated === true) {
                        upQueries.push(new Query(`CREATE SEQUENCE IF NOT EXISTS ${this.escapePath(this.buildSequencePath(table, newColumn))} OWNED BY ${this.escapePath(table)}."${newColumn.name}"`));
                        downQueries.push(new Query(`DROP SEQUENCE ${this.escapePath(this.buildSequencePath(table, newColumn))}`));
                        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" SET DEFAULT nextval('${this.escapePath(this.buildSequencePath(table, newColumn))}')`));
                        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" DROP DEFAULT`));
                    }
                    else {
                        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" DROP DEFAULT`));
                        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" SET DEFAULT nextval('${this.escapePath(this.buildSequencePath(table, newColumn))}')`));
                        upQueries.push(new Query(`DROP SEQUENCE ${this.escapePath(this.buildSequencePath(table, newColumn))}`));
                        downQueries.push(new Query(`CREATE SEQUENCE IF NOT EXISTS ${this.escapePath(this.buildSequencePath(table, newColumn))} OWNED BY ${this.escapePath(table)}."${newColumn.name}"`));
                    }
                }
            }
            // the default might have changed when the enum changed
            if (newColumn.default !== oldColumn.default &&
                !defaultValueChanged) {
                if (newColumn.default !== null &&
                    newColumn.default !== undefined) {
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" SET DEFAULT ${newColumn.default}`));
                    if (oldColumn.default !== null &&
                        oldColumn.default !== undefined) {
                        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" SET DEFAULT ${oldColumn.default}`));
                    }
                    else {
                        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" DROP DEFAULT`));
                    }
                }
                else if (oldColumn.default !== null &&
                    oldColumn.default !== undefined) {
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" DROP DEFAULT`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" SET DEFAULT ${oldColumn.default}`));
                }
            }
            if ((newColumn.spatialFeatureType || "").toLowerCase() !==
                (oldColumn.spatialFeatureType || "").toLowerCase() ||
                newColumn.srid !== oldColumn.srid) {
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" TYPE ${this.driver.createFullType(newColumn)}`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" TYPE ${this.driver.createFullType(oldColumn)}`));
            }
            // update column collation
            if (newColumn.collation !== oldColumn.collation) {
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" TYPE ${newColumn.type} COLLATE "${newColumn.collation}"`));
                const oldCollation = oldColumn.collation
                    ? `"${oldColumn.collation}"`
                    : `pg_catalog."default"`; // if there's no old collation, use default
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN "${newColumn.name}" TYPE ${newColumn.type} COLLATE ${oldCollation}`));
            }
            if (newColumn.generatedType !== oldColumn.generatedType) {
                // Convert generated column data to normal column
                if (!newColumn.generatedType ||
                    newColumn.generatedType === "VIRTUAL") {
                    // We can copy the generated data to the new column
                    const tableNameWithSchema = (await this.getTableNameWithSchema(table.name)).split(".");
                    const tableName = tableNameWithSchema[1];
                    const schema = tableNameWithSchema[0];
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} RENAME COLUMN "${oldColumn.name}" TO "TEMP_OLD_${oldColumn.name}"`));
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD ${this.buildCreateColumnSql(table, newColumn)}`));
                    upQueries.push(new Query(`UPDATE ${this.escapePath(table)} SET "${newColumn.name}" = "TEMP_OLD_${oldColumn.name}"`));
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP COLUMN "TEMP_OLD_${oldColumn.name}"`));
                    upQueries.push(this.deleteTypeormMetadataSql({
                        database: this.driver.database,
                        schema,
                        table: tableName,
                        type: MetadataTableType.GENERATED_COLUMN,
                        name: oldColumn.name,
                    }));
                    // However, we can't copy it back on downgrade. It needs to regenerate.
                    downQueries.push(this.insertTypeormMetadataSql({
                        database: this.driver.database,
                        schema,
                        table: tableName,
                        type: MetadataTableType.GENERATED_COLUMN,
                        name: oldColumn.name,
                        value: oldColumn.asExpression,
                    }));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD ${this.buildCreateColumnSql(table, oldColumn)}`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP COLUMN "${newColumn.name}"`));
                    // downQueries.push(
                    //     this.deleteTypeormMetadataSql({
                    //         database: this.driver.database,
                    //         schema,
                    //         table: tableName,
                    //         type: MetadataTableType.GENERATED_COLUMN,
                    //         name: newColumn.name,
                    //     }),
                    // )
                }
            }
        }
        await this.executeQueries(upQueries, downQueries);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Changes a column in the table.
     */
    async changeColumns(tableOrName, changedColumns) {
        for (const { oldColumn, newColumn } of changedColumns) {
            await this.changeColumn(tableOrName, oldColumn, newColumn);
        }
    }
    /**
     * Drops column in the table.
     */
    async dropColumn(tableOrName, columnOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const column = InstanceChecker.isTableColumn(columnOrName)
            ? columnOrName
            : table.findColumnByName(columnOrName);
        if (!column)
            throw new TypeORMError(`Column "${columnOrName}" was not found in table "${table.name}"`);
        const clonedTable = table.clone();
        const upQueries = [];
        const downQueries = [];
        // drop primary key constraint
        if (column.isPrimary) {
            const pkName = column.primaryKeyConstraintName
                ? column.primaryKeyConstraintName
                : this.connection.namingStrategy.primaryKeyName(clonedTable, clonedTable.primaryColumns.map((column) => column.name));
            const columnNames = clonedTable.primaryColumns
                .map((primaryColumn) => `"${primaryColumn.name}"`)
                .join(", ");
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} DROP CONSTRAINT "${pkName}"`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
            // update column in table
            const tableColumn = clonedTable.findColumnByName(column.name);
            tableColumn.isPrimary = false;
            // if primary key have multiple columns, we must recreate it without dropped column
            if (clonedTable.primaryColumns.length > 0) {
                const pkName = clonedTable.primaryColumns[0]
                    .primaryKeyConstraintName
                    ? clonedTable.primaryColumns[0].primaryKeyConstraintName
                    : this.connection.namingStrategy.primaryKeyName(clonedTable, clonedTable.primaryColumns.map((column) => column.name));
                const columnNames = clonedTable.primaryColumns
                    .map((primaryColumn) => `"${primaryColumn.name}"`)
                    .join(", ");
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} DROP CONSTRAINT "${pkName}"`));
            }
        }
        // drop column index
        const columnIndex = clonedTable.indices.find((index) => index.columnNames.length === 1 &&
            index.columnNames[0] === column.name);
        if (columnIndex) {
            clonedTable.indices.splice(clonedTable.indices.indexOf(columnIndex), 1);
            upQueries.push(this.dropIndexSql(table, columnIndex));
            downQueries.push(this.createIndexSql(table, columnIndex));
        }
        // drop column check
        const columnCheck = clonedTable.checks.find((check) => !!check.columnNames &&
            check.columnNames.length === 1 &&
            check.columnNames[0] === column.name);
        if (columnCheck) {
            clonedTable.checks.splice(clonedTable.checks.indexOf(columnCheck), 1);
            upQueries.push(this.dropCheckConstraintSql(table, columnCheck));
            downQueries.push(this.createCheckConstraintSql(table, columnCheck));
        }
        // drop column unique
        const columnUnique = clonedTable.uniques.find((unique) => unique.columnNames.length === 1 &&
            unique.columnNames[0] === column.name);
        if (columnUnique) {
            clonedTable.uniques.splice(clonedTable.uniques.indexOf(columnUnique), 1);
            upQueries.push(this.dropUniqueConstraintSql(table, columnUnique));
            downQueries.push(this.createUniqueConstraintSql(table, columnUnique));
        }
        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP COLUMN "${column.name}"`));
        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD ${this.buildCreateColumnSql(table, column)}`));
        // drop enum type
        if (column.type === "enum" || column.type === "simple-enum") {
            const hasEnum = await this.hasEnumType(table, column);
            if (hasEnum) {
                const enumType = await this.getUserDefinedTypeName(table, column);
                const escapedEnumName = `"${enumType.schema}"."${enumType.name}"`;
                upQueries.push(this.dropEnumTypeSql(table, column, escapedEnumName));
                downQueries.push(this.createEnumTypeSql(table, column, escapedEnumName));
            }
        }
        if (column.generatedType === "STORED") {
            const tableNameWithSchema = (await this.getTableNameWithSchema(table.name)).split(".");
            const tableName = tableNameWithSchema[1];
            const schema = tableNameWithSchema[0];
            const deleteQuery = this.deleteTypeormMetadataSql({
                database: this.driver.database,
                schema,
                table: tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            const insertQuery = this.insertTypeormMetadataSql({
                database: this.driver.database,
                schema,
                table: tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            upQueries.push(deleteQuery);
            downQueries.push(insertQuery);
        }
        await this.executeQueries(upQueries, downQueries);
        clonedTable.removeColumn(column);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Drops the columns in the table.
     */
    async dropColumns(tableOrName, columns) {
        for (const column of [...columns]) {
            await this.dropColumn(tableOrName, column);
        }
    }
    /**
     * Creates a new primary key.
     */
    async createPrimaryKey(tableOrName, columnNames, constraintName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const clonedTable = table.clone();
        const up = this.createPrimaryKeySql(table, columnNames, constraintName);
        // mark columns as primary, because dropPrimaryKeySql build constraint name from table primary column names.
        clonedTable.columns.forEach((column) => {
            if (columnNames.find((columnName) => columnName === column.name))
                column.isPrimary = true;
        });
        const down = this.dropPrimaryKeySql(clonedTable);
        await this.executeQueries(up, down);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Updates composite primary keys.
     */
    async updatePrimaryKeys(tableOrName, columns) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const clonedTable = table.clone();
        const columnNames = columns.map((column) => column.name);
        const upQueries = [];
        const downQueries = [];
        // if table already have primary columns, we must drop them.
        const primaryColumns = clonedTable.primaryColumns;
        if (primaryColumns.length > 0) {
            const pkName = primaryColumns[0].primaryKeyConstraintName
                ? primaryColumns[0].primaryKeyConstraintName
                : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
            const columnNamesString = primaryColumns
                .map((column) => `"${column.name}"`)
                .join(", ");
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNamesString})`));
        }
        // update columns in table.
        clonedTable.columns
            .filter((column) => columnNames.indexOf(column.name) !== -1)
            .forEach((column) => (column.isPrimary = true));
        const pkName = primaryColumns[0]?.primaryKeyConstraintName
            ? primaryColumns[0].primaryKeyConstraintName
            : this.connection.namingStrategy.primaryKeyName(clonedTable, columnNames);
        const columnNamesString = columnNames
            .map((columnName) => `"${columnName}"`)
            .join(", ");
        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNamesString})`));
        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
        await this.executeQueries(upQueries, downQueries);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Drops a primary key.
     */
    async dropPrimaryKey(tableOrName, constraintName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const up = this.dropPrimaryKeySql(table);
        const down = this.createPrimaryKeySql(table, table.primaryColumns.map((column) => column.name), constraintName);
        await this.executeQueries(up, down);
        table.primaryColumns.forEach((column) => {
            column.isPrimary = false;
        });
    }
    /**
     * Creates new unique constraint.
     */
    async createUniqueConstraint(tableOrName, uniqueConstraint) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // new unique constraint may be passed without name. In this case we generate unique name manually.
        if (!uniqueConstraint.name)
            uniqueConstraint.name =
                this.connection.namingStrategy.uniqueConstraintName(table, uniqueConstraint.columnNames);
        const up = this.createUniqueConstraintSql(table, uniqueConstraint);
        const down = this.dropUniqueConstraintSql(table, uniqueConstraint);
        await this.executeQueries(up, down);
        table.addUniqueConstraint(uniqueConstraint);
    }
    /**
     * Creates new unique constraints.
     */
    async createUniqueConstraints(tableOrName, uniqueConstraints) {
        for (const uniqueConstraint of uniqueConstraints) {
            await this.createUniqueConstraint(tableOrName, uniqueConstraint);
        }
    }
    /**
     * Drops unique constraint.
     */
    async dropUniqueConstraint(tableOrName, uniqueOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const uniqueConstraint = InstanceChecker.isTableUnique(uniqueOrName)
            ? uniqueOrName
            : table.uniques.find((u) => u.name === uniqueOrName);
        if (!uniqueConstraint)
            throw new TypeORMError(`Supplied unique constraint was not found in table ${table.name}`);
        const up = this.dropUniqueConstraintSql(table, uniqueConstraint);
        const down = this.createUniqueConstraintSql(table, uniqueConstraint);
        await this.executeQueries(up, down);
        table.removeUniqueConstraint(uniqueConstraint);
    }
    /**
     * Drops unique constraints.
     */
    async dropUniqueConstraints(tableOrName, uniqueConstraints) {
        for (const uniqueConstraint of [...uniqueConstraints]) {
            await this.dropUniqueConstraint(tableOrName, uniqueConstraint);
        }
    }
    /**
     * Creates new check constraint.
     */
    async createCheckConstraint(tableOrName, checkConstraint) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // new unique constraint may be passed without name. In this case we generate unique name manually.
        if (!checkConstraint.name)
            checkConstraint.name =
                this.connection.namingStrategy.checkConstraintName(table, checkConstraint.expression);
        const up = this.createCheckConstraintSql(table, checkConstraint);
        const down = this.dropCheckConstraintSql(table, checkConstraint);
        await this.executeQueries(up, down);
        table.addCheckConstraint(checkConstraint);
    }
    /**
     * Creates new check constraints.
     */
    async createCheckConstraints(tableOrName, checkConstraints) {
        const promises = checkConstraints.map((checkConstraint) => this.createCheckConstraint(tableOrName, checkConstraint));
        await Promise.all(promises);
    }
    /**
     * Drops check constraint.
     */
    async dropCheckConstraint(tableOrName, checkOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const checkConstraint = InstanceChecker.isTableCheck(checkOrName)
            ? checkOrName
            : table.checks.find((c) => c.name === checkOrName);
        if (!checkConstraint)
            throw new TypeORMError(`Supplied check constraint was not found in table ${table.name}`);
        const up = this.dropCheckConstraintSql(table, checkConstraint);
        const down = this.createCheckConstraintSql(table, checkConstraint);
        await this.executeQueries(up, down);
        table.removeCheckConstraint(checkConstraint);
    }
    /**
     * Drops check constraints.
     */
    async dropCheckConstraints(tableOrName, checkConstraints) {
        const promises = checkConstraints.map((checkConstraint) => this.dropCheckConstraint(tableOrName, checkConstraint));
        await Promise.all(promises);
    }
    /**
     * Creates new exclusion constraint.
     */
    async createExclusionConstraint(tableOrName, exclusionConstraint) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // new unique constraint may be passed without name. In this case we generate unique name manually.
        if (!exclusionConstraint.name)
            exclusionConstraint.name =
                this.connection.namingStrategy.exclusionConstraintName(table, exclusionConstraint.expression);
        const up = this.createExclusionConstraintSql(table, exclusionConstraint);
        const down = this.dropExclusionConstraintSql(table, exclusionConstraint);
        await this.executeQueries(up, down);
        table.addExclusionConstraint(exclusionConstraint);
    }
    /**
     * Creates new exclusion constraints.
     */
    async createExclusionConstraints(tableOrName, exclusionConstraints) {
        const promises = exclusionConstraints.map((exclusionConstraint) => this.createExclusionConstraint(tableOrName, exclusionConstraint));
        await Promise.all(promises);
    }
    /**
     * Drops exclusion constraint.
     */
    async dropExclusionConstraint(tableOrName, exclusionOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const exclusionConstraint = InstanceChecker.isTableExclusion(exclusionOrName)
            ? exclusionOrName
            : table.exclusions.find((c) => c.name === exclusionOrName);
        if (!exclusionConstraint)
            throw new TypeORMError(`Supplied exclusion constraint was not found in table ${table.name}`);
        const up = this.dropExclusionConstraintSql(table, exclusionConstraint);
        const down = this.createExclusionConstraintSql(table, exclusionConstraint);
        await this.executeQueries(up, down);
        table.removeExclusionConstraint(exclusionConstraint);
    }
    /**
     * Drops exclusion constraints.
     */
    async dropExclusionConstraints(tableOrName, exclusionConstraints) {
        const promises = exclusionConstraints.map((exclusionConstraint) => this.dropExclusionConstraint(tableOrName, exclusionConstraint));
        await Promise.all(promises);
    }
    /**
     * Creates a new foreign key.
     */
    async createForeignKey(tableOrName, foreignKey) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // new FK may be passed without name. In this case we generate FK name manually.
        if (!foreignKey.name)
            foreignKey.name = this.connection.namingStrategy.foreignKeyName(table, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
        const up = this.createForeignKeySql(table, foreignKey);
        const down = this.dropForeignKeySql(table, foreignKey);
        await this.executeQueries(up, down);
        table.addForeignKey(foreignKey);
    }
    /**
     * Creates a new foreign keys.
     */
    async createForeignKeys(tableOrName, foreignKeys) {
        for (const foreignKey of foreignKeys) {
            await this.createForeignKey(tableOrName, foreignKey);
        }
    }
    /**
     * Drops a foreign key from the table.
     */
    async dropForeignKey(tableOrName, foreignKeyOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const foreignKey = InstanceChecker.isTableForeignKey(foreignKeyOrName)
            ? foreignKeyOrName
            : table.foreignKeys.find((fk) => fk.name === foreignKeyOrName);
        if (!foreignKey)
            throw new TypeORMError(`Supplied foreign key was not found in table ${table.name}`);
        if (!foreignKey.name) {
            foreignKey.name = this.connection.namingStrategy.foreignKeyName(table, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
        }
        const up = this.dropForeignKeySql(table, foreignKey);
        const down = this.createForeignKeySql(table, foreignKey);
        await this.executeQueries(up, down);
        table.removeForeignKey(foreignKey);
    }
    /**
     * Drops a foreign keys from the table.
     */
    async dropForeignKeys(tableOrName, foreignKeys) {
        for (const foreignKey of [...foreignKeys]) {
            await this.dropForeignKey(tableOrName, foreignKey);
        }
    }
    /**
     * Creates a new index.
     */
    async createIndex(tableOrName, index) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // new index may be passed without name. In this case we generate index name manually.
        if (!index.name)
            index.name = this.generateIndexName(table, index);
        const up = this.createIndexSql(table, index);
        const down = this.dropIndexSql(table, index);
        await this.executeQueries(up, down);
        table.addIndex(index);
    }
    /**
     * Create a new view index.
     */
    async createViewIndex(viewOrName, index) {
        const view = InstanceChecker.isView(viewOrName)
            ? viewOrName
            : await this.getCachedView(viewOrName);
        // new index may be passed without name. In this case we generate index name manually.
        if (!index.name)
            index.name = this.generateIndexName(view, index);
        const up = this.createViewIndexSql(view, index);
        const down = this.dropIndexSql(view, index);
        await this.executeQueries(up, down);
        view.addIndex(index);
    }
    /**
     * Creates a new indices
     */
    async createIndices(tableOrName, indices) {
        for (const index of indices) {
            await this.createIndex(tableOrName, index);
        }
    }
    /**
     * Creates new view indices
     */
    async createViewIndices(viewOrName, indices) {
        for (const index of indices) {
            await this.createViewIndex(viewOrName, index);
        }
    }
    /**
     * Drops an index from the table.
     */
    async dropIndex(tableOrName, indexOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const index = InstanceChecker.isTableIndex(indexOrName)
            ? indexOrName
            : table.indices.find((i) => i.name === indexOrName);
        if (!index)
            throw new TypeORMError(`Supplied index ${indexOrName} was not found in table ${table.name}`);
        // old index may be passed without name. In this case we generate index name manually.
        if (!index.name)
            index.name = this.generateIndexName(table, index);
        const up = this.dropIndexSql(table, index);
        const down = this.createIndexSql(table, index);
        await this.executeQueries(up, down);
        table.removeIndex(index);
    }
    /**
     * Drops an index from a view.
     */
    async dropViewIndex(viewOrName, indexOrName) {
        const view = InstanceChecker.isView(viewOrName)
            ? viewOrName
            : await this.getCachedView(viewOrName);
        const index = InstanceChecker.isTableIndex(indexOrName)
            ? indexOrName
            : view.indices.find((i) => i.name === indexOrName);
        if (!index)
            throw new TypeORMError(`Supplied index ${indexOrName} was not found in view ${view.name}`);
        // old index may be passed without name. In this case we generate index name manually.
        if (!index.name)
            index.name = this.generateIndexName(view, index);
        const up = this.dropIndexSql(view, index);
        const down = this.createViewIndexSql(view, index);
        await this.executeQueries(up, down);
        view.removeIndex(index);
    }
    /**
     * Drops an indices from the table.
     */
    async dropIndices(tableOrName, indices) {
        for (const index of [...indices]) {
            await this.dropIndex(tableOrName, index);
        }
    }
    /**
     * Clears all table contents.
     * Note: this operation uses SQL's TRUNCATE query which cannot be reverted in transactions.
     */
    async clearTable(tableName) {
        await this.query(`TRUNCATE TABLE ${this.escapePath(tableName)}`);
    }
    /**
     * Removes all tables from the currently connected database.
     */
    async clearDatabase() {
        const schemas = [];
        this.connection.entityMetadatas
            .filter((metadata) => metadata.schema)
            .forEach((metadata) => {
            const isSchemaExist = !!schemas.find((schema) => schema === metadata.schema);
            if (!isSchemaExist)
                schemas.push(metadata.schema);
        });
        schemas.push(this.driver.options.schema || "current_schema()");
        const schemaNamesString = schemas
            .map((name) => {
            return name === "current_schema()" ? name : "'" + name + "'";
        })
            .join(", ");
        const isAnotherTransactionActive = this.isTransactionActive;
        if (!isAnotherTransactionActive)
            await this.startTransaction();
        try {
            // drop views
            const selectViewDropsQuery = `SELECT 'DROP VIEW IF EXISTS "' || schemaname || '"."' || viewname || '" CASCADE;' as "query" ` +
                `FROM "pg_views" WHERE "schemaname" IN (${schemaNamesString}) AND "viewname" NOT IN ('geography_columns', 'geometry_columns', 'raster_columns', 'raster_overviews')`;
            const dropViewQueries = await this.query(selectViewDropsQuery);
            await Promise.all(dropViewQueries.map((q) => this.query(q["query"])));
            // drop materialized views
            // Note: materialized views introduced in Postgres 9.3
            if (DriverUtils.isReleaseVersionOrGreater(this.driver, "9.3")) {
                const selectMatViewDropsQuery = `SELECT 'DROP MATERIALIZED VIEW IF EXISTS "' || schemaname || '"."' || matviewname || '" CASCADE;' as "query" ` +
                    `FROM "pg_matviews" WHERE "schemaname" IN (${schemaNamesString})`;
                const dropMatViewQueries = await this.query(selectMatViewDropsQuery);
                await Promise.all(dropMatViewQueries.map((q) => this.query(q["query"])));
            }
            // ignore spatial_ref_sys; it's a special table supporting PostGIS
            // TODO generalize this as this.driver.ignoreTables
            // drop tables
            const selectTableDropsQuery = `SELECT 'DROP TABLE IF EXISTS "' || schemaname || '"."' || tablename || '" CASCADE;' as "query" FROM "pg_tables" WHERE "schemaname" IN (${schemaNamesString}) AND "tablename" NOT IN ('spatial_ref_sys')`;
            const dropTableQueries = await this.query(selectTableDropsQuery);
            await Promise.all(dropTableQueries.map((q) => this.query(q["query"])));
            // drop enum types
            await this.dropEnumTypes(schemaNamesString);
            if (!isAnotherTransactionActive) {
                await this.commitTransaction();
            }
        }
        catch (error) {
            try {
                // we throw original error even if rollback thrown an error
                if (!isAnotherTransactionActive) {
                    await this.rollbackTransaction();
                }
            }
            catch {
                // no-op
            }
            throw error;
        }
    }
    // -------------------------------------------------------------------------
    // Protected Methods
    // -------------------------------------------------------------------------
    async loadViews(viewNames) {
        const hasTable = await this.hasTable(this.getTypeormMetadataTableName());
        if (!hasTable)
            return [];
        if (!viewNames) {
            viewNames = [];
        }
        const currentDatabase = await this.getCurrentDatabase();
        const currentSchema = await this.getCurrentSchema();
        const viewsCondition = viewNames.length === 0
            ? "1=1"
            : viewNames
                .map((tableName) => this.driver.parseTableName(tableName))
                .map(({ schema, tableName }) => {
                if (!schema) {
                    schema =
                        this.driver.options.schema || currentSchema;
                }
                return `("t"."schema" = '${schema}' AND "t"."name" = '${tableName}')`;
            })
                .join(" OR ");
        const constraintsCondition = viewNames.length === 0
            ? "1=1"
            : viewNames
                .map((tableName) => this.driver.parseTableName(tableName))
                .map(({ schema, tableName }) => {
                if (!schema) {
                    schema =
                        this.driver.options.schema || currentSchema;
                }
                return `("ns"."nspname" = '${schema}' AND "t"."relname" = '${tableName}')`;
            })
                .join(" OR ");
        const indicesSql = `SELECT "ns"."nspname" AS "table_schema", "t"."relname" AS "table_name", "i"."relname" AS "constraint_name", "a"."attname" AS "column_name", ` +
            `CASE "ix"."indisunique" WHEN 't' THEN 'TRUE' ELSE'FALSE' END AS "is_unique", pg_get_expr("ix"."indpred", "ix"."indrelid") AS "condition", ` +
            `"types"."typname" AS "type_name" ` +
            `FROM "pg_class" "t" ` +
            `INNER JOIN "pg_index" "ix" ON "ix"."indrelid" = "t"."oid" ` +
            `INNER JOIN "pg_attribute" "a" ON "a"."attrelid" = "t"."oid"  AND "a"."attnum" = ANY ("ix"."indkey") ` +
            `INNER JOIN "pg_namespace" "ns" ON "ns"."oid" = "t"."relnamespace" ` +
            `INNER JOIN "pg_class" "i" ON "i"."oid" = "ix"."indexrelid" ` +
            `INNER JOIN "pg_type" "types" ON "types"."oid" = "a"."atttypid" ` +
            `LEFT JOIN "pg_constraint" "cnst" ON "cnst"."conname" = "i"."relname" ` +
            `WHERE "t"."relkind" IN ('m') AND "cnst"."contype" IS NULL AND (${constraintsCondition})`;
        const query = `SELECT "t".* FROM ${this.escapePath(this.getTypeormMetadataTableName())} "t" ` +
            `INNER JOIN "pg_catalog"."pg_class" "c" ON "c"."relname" = "t"."name" ` +
            `INNER JOIN "pg_namespace" "n" ON "n"."oid" = "c"."relnamespace" AND "n"."nspname" = "t"."schema" ` +
            `WHERE "t"."type" IN ('${MetadataTableType.VIEW}', '${MetadataTableType.MATERIALIZED_VIEW}') ${viewsCondition ? `AND (${viewsCondition})` : ""}`;
        const dbViews = await this.query(query);
        const dbIndices = await this.query(indicesSql);
        return dbViews.map((dbView) => {
            // find index constraints of table, group them by constraint name and build TableIndex.
            const tableIndexConstraints = OrmUtils.uniq(dbIndices.filter((dbIndex) => {
                return (dbIndex["table_name"] === dbView["name"] &&
                    dbIndex["table_schema"] === dbView["schema"]);
            }), (dbIndex) => dbIndex["constraint_name"]);
            const view = new View();
            const schema = dbView["schema"] === currentSchema &&
                !this.driver.options.schema
                ? undefined
                : dbView["schema"];
            view.database = currentDatabase;
            view.schema = dbView["schema"];
            view.name = this.driver.buildTableName(dbView["name"], schema);
            view.expression = dbView["value"];
            view.materialized =
                dbView["type"] === MetadataTableType.MATERIALIZED_VIEW;
            view.indices = tableIndexConstraints.map((constraint) => {
                const indices = dbIndices.filter((index) => {
                    return (index["table_schema"] === constraint["table_schema"] &&
                        index["table_name"] === constraint["table_name"] &&
                        index["constraint_name"] ===
                            constraint["constraint_name"]);
                });
                return new TableIndex({
                    view: view,
                    name: constraint["constraint_name"],
                    columnNames: indices.map((i) => i["column_name"]),
                    isUnique: constraint["is_unique"] === "TRUE",
                    where: constraint["condition"],
                    isFulltext: false,
                });
            });
            return view;
        });
    }
    /**
     * Loads all tables (with given names) from the database and creates a Table from them.
     */
    async loadTables(tableNames) {
        // if no tables given then no need to proceed
        if (tableNames && tableNames.length === 0) {
            return [];
        }
        const currentSchema = await this.getCurrentSchema();
        const currentDatabase = await this.getCurrentDatabase();
        const dbTables = [];
        if (!tableNames) {
            const tablesSql = `SELECT "table_schema", "table_name", obj_description(('"' || "table_schema" || '"."' || "table_name" || '"')::regclass, 'pg_class') AS table_comment FROM "information_schema"."tables"`;
            dbTables.push(...(await this.query(tablesSql)));
        }
        else {
            const tablesCondition = tableNames
                .map((tableName) => this.driver.parseTableName(tableName))
                .map(({ schema, tableName }) => {
                return `("table_schema" = '${schema || currentSchema}' AND "table_name" = '${tableName}')`;
            })
                .join(" OR ");
            const tablesSql = `SELECT "table_schema", "table_name", obj_description(('"' || "table_schema" || '"."' || "table_name" || '"')::regclass, 'pg_class') AS table_comment FROM "information_schema"."tables" WHERE ` +
                tablesCondition;
            dbTables.push(...(await this.query(tablesSql)));
        }
        // if tables were not found in the db, no need to proceed
        if (dbTables.length === 0) {
            return [];
        }
        /**
         * Uses standard SQL information_schema.columns table and postgres-specific
         * pg_catalog.pg_attribute table to get column information.
         * @see https://stackoverflow.com/a/19541865
         */
        const columnsCondition = dbTables
            .map(({ table_schema, table_name }) => {
            return `("table_schema" = '${table_schema}' AND "table_name" = '${table_name}')`;
        })
            .join(" OR ");
        const columnsSql = `SELECT columns.*, pg_catalog.col_description(('"' || table_catalog || '"."' || table_schema || '"."' || table_name || '"')::regclass::oid, ordinal_position) AS description, ` +
            `('"' || "udt_schema" || '"."' || "udt_name" || '"')::"regtype"::text AS "regtype", pg_catalog.format_type("col_attr"."atttypid", "col_attr"."atttypmod") AS "format_type" ` +
            `FROM "information_schema"."columns" ` +
            `LEFT JOIN "pg_catalog"."pg_attribute" AS "col_attr" ON "col_attr"."attname" = "columns"."column_name" ` +
            `AND "col_attr"."attrelid" = ( ` +
            `SELECT "cls"."oid" FROM "pg_catalog"."pg_class" AS "cls" ` +
            `LEFT JOIN "pg_catalog"."pg_namespace" AS "ns" ON "ns"."oid" = "cls"."relnamespace" ` +
            `WHERE "cls"."relname" = "columns"."table_name" ` +
            `AND "ns"."nspname" = "columns"."table_schema" ` +
            `) ` +
            `WHERE ` +
            columnsCondition;
        const constraintsCondition = dbTables
            .map(({ table_schema, table_name }) => {
            return `("ns"."nspname" = '${table_schema}' AND "t"."relname" = '${table_name}')`;
        })
            .join(" OR ");
        const constraintsSql = `SELECT "ns"."nspname" AS "table_schema", "t"."relname" AS "table_name", "cnst"."conname" AS "constraint_name", ` +
            `pg_get_constraintdef("cnst"."oid") AS "expression", ` +
            `CASE "cnst"."contype" WHEN 'p' THEN 'PRIMARY' WHEN 'u' THEN 'UNIQUE' WHEN 'c' THEN 'CHECK' WHEN 'x' THEN 'EXCLUDE' END AS "constraint_type", "a"."attname" AS "column_name" ` +
            `FROM "pg_constraint" "cnst" ` +
            `INNER JOIN "pg_class" "t" ON "t"."oid" = "cnst"."conrelid" ` +
            `INNER JOIN "pg_namespace" "ns" ON "ns"."oid" = "cnst"."connamespace" ` +
            `LEFT JOIN "pg_attribute" "a" ON "a"."attrelid" = "cnst"."conrelid" AND "a"."attnum" = ANY ("cnst"."conkey") ` +
            `WHERE "t"."relkind" IN ('r', 'p') AND (${constraintsCondition})`;
        const indicesSql = `SELECT "ns"."nspname" AS "table_schema", "t"."relname" AS "table_name", "i"."relname" AS "constraint_name", "a"."attname" AS "column_name", ` +
            `CASE "ix"."indisunique" WHEN 't' THEN 'TRUE' ELSE'FALSE' END AS "is_unique", pg_get_expr("ix"."indpred", "ix"."indrelid") AS "condition", ` +
            `"types"."typname" AS "type_name", "am"."amname" AS "index_type" ` +
            `FROM "pg_class" "t" ` +
            `INNER JOIN "pg_index" "ix" ON "ix"."indrelid" = "t"."oid" ` +
            `INNER JOIN "pg_attribute" "a" ON "a"."attrelid" = "t"."oid"  AND "a"."attnum" = ANY ("ix"."indkey") ` +
            `INNER JOIN "pg_namespace" "ns" ON "ns"."oid" = "t"."relnamespace" ` +
            `INNER JOIN "pg_class" "i" ON "i"."oid" = "ix"."indexrelid" ` +
            `INNER JOIN "pg_type" "types" ON "types"."oid" = "a"."atttypid" ` +
            `INNER JOIN "pg_am" "am" ON "i"."relam" = "am"."oid" ` +
            `LEFT JOIN "pg_constraint" "cnst" ON "cnst"."conname" = "i"."relname" ` +
            `WHERE "t"."relkind" IN ('r', 'p') AND "cnst"."contype" IS NULL AND (${constraintsCondition})`;
        const foreignKeysCondition = dbTables
            .map(({ table_schema, table_name }) => {
            return `("ns"."nspname" = '${table_schema}' AND "cl"."relname" = '${table_name}')`;
        })
            .join(" OR ");
        const hasRelispartitionColumn = await this.hasSupportForPartitionedTables();
        const isPartitionCondition = hasRelispartitionColumn
            ? ` AND "cl"."relispartition" = 'f'`
            : "";
        const foreignKeysSql = `SELECT "con"."conname" AS "constraint_name", "con"."nspname" AS "table_schema", "con"."relname" AS "table_name", "att2"."attname" AS "column_name", ` +
            `"ns"."nspname" AS "referenced_table_schema", "cl"."relname" AS "referenced_table_name", "att"."attname" AS "referenced_column_name", "con"."confdeltype" AS "on_delete", ` +
            `"con"."confupdtype" AS "on_update", "con"."condeferrable" AS "deferrable", "con"."condeferred" AS "deferred" ` +
            `FROM ( ` +
            `SELECT UNNEST ("con1"."conkey") AS "parent", UNNEST ("con1"."confkey") AS "child", "con1"."confrelid", "con1"."conrelid", "con1"."conname", "con1"."contype", "ns"."nspname", ` +
            `"cl"."relname", "con1"."condeferrable", ` +
            `CASE WHEN "con1"."condeferred" THEN 'INITIALLY DEFERRED' ELSE 'INITIALLY IMMEDIATE' END as condeferred, ` +
            `CASE "con1"."confdeltype" WHEN 'a' THEN 'NO ACTION' WHEN 'r' THEN 'RESTRICT' WHEN 'c' THEN 'CASCADE' WHEN 'n' THEN 'SET NULL' WHEN 'd' THEN 'SET DEFAULT' END as "confdeltype", ` +
            `CASE "con1"."confupdtype" WHEN 'a' THEN 'NO ACTION' WHEN 'r' THEN 'RESTRICT' WHEN 'c' THEN 'CASCADE' WHEN 'n' THEN 'SET NULL' WHEN 'd' THEN 'SET DEFAULT' END as "confupdtype" ` +
            `FROM "pg_class" "cl" ` +
            `INNER JOIN "pg_namespace" "ns" ON "cl"."relnamespace" = "ns"."oid" ` +
            `INNER JOIN "pg_constraint" "con1" ON "con1"."conrelid" = "cl"."oid" ` +
            `WHERE "con1"."contype" = 'f' AND (${foreignKeysCondition}) ` +
            `) "con" ` +
            `INNER JOIN "pg_attribute" "att" ON "att"."attrelid" = "con"."confrelid" AND "att"."attnum" = "con"."child" ` +
            `INNER JOIN "pg_class" "cl" ON "cl"."oid" = "con"."confrelid" ${isPartitionCondition}` +
            `INNER JOIN "pg_namespace" "ns" ON "cl"."relnamespace" = "ns"."oid" ` +
            `INNER JOIN "pg_attribute" "att2" ON "att2"."attrelid" = "con"."conrelid" AND "att2"."attnum" = "con"."parent"`;
        const [dbColumns, dbConstraints, dbIndices, dbForeignKeys,] = await Promise.all([
            this.query(columnsSql),
            this.query(constraintsSql),
            this.query(indicesSql),
            this.query(foreignKeysSql),
        ]);
        // create tables for loaded tables
        return Promise.all(dbTables.map(async (dbTable) => {
            const table = new Table();
            const getSchemaFromKey = (dbObject, key) => {
                return dbObject[key] === currentSchema &&
                    (!this.driver.options.schema ||
                        this.driver.options.schema === currentSchema)
                    ? undefined
                    : dbObject[key];
            };
            // We do not need to join schema name, when database is by default.
            const schema = getSchemaFromKey(dbTable, "table_schema");
            table.database = currentDatabase;
            table.schema = dbTable["table_schema"];
            table.comment = dbTable["table_comment"];
            table.name = this.driver.buildTableName(dbTable["table_name"], schema);
            // create columns from the loaded columns
            table.columns = await Promise.all(dbColumns
                .filter((dbColumn) => dbColumn["table_name"] ===
                dbTable["table_name"] &&
                dbColumn["table_schema"] ===
                    dbTable["table_schema"])
                .map(async (dbColumn) => {
                const columnConstraints = dbConstraints.filter((dbConstraint) => {
                    return (dbConstraint["table_name"] ===
                        dbColumn["table_name"] &&
                        dbConstraint["table_schema"] ===
                            dbColumn["table_schema"] &&
                        dbConstraint["column_name"] ===
                            dbColumn["column_name"]);
                });
                const tableColumn = new TableColumn();
                tableColumn.name = dbColumn["column_name"];
                tableColumn.type = dbColumn["regtype"].toLowerCase();
                if (tableColumn.type === "vector" ||
                    tableColumn.type === "halfvec") {
                    const lengthMatch = dbColumn["format_type"].match(/^(?:vector|halfvec)\((\d+)\)$/);
                    if (lengthMatch && lengthMatch[1]) {
                        tableColumn.length = lengthMatch[1];
                    }
                }
                if (tableColumn.type === "numeric" ||
                    tableColumn.type === "numeric[]" ||
                    tableColumn.type === "decimal" ||
                    tableColumn.type === "float") {
                    let numericPrecision = dbColumn["numeric_precision"];
                    let numericScale = dbColumn["numeric_scale"];
                    if (dbColumn["data_type"] === "ARRAY") {
                        const numericSize = dbColumn["format_type"].match(/^numeric\(([0-9]+),([0-9]+)\)\[\]$/);
                        if (numericSize) {
                            numericPrecision = +numericSize[1];
                            numericScale = +numericSize[2];
                        }
                    }
                    // If one of these properties was set, and another was not, Postgres sets '0' in to unspecified property
                    // we set 'undefined' in to unspecified property to avoid changing column on sync
                    if (numericPrecision !== null &&
                        !this.isDefaultColumnPrecision(table, tableColumn, numericPrecision)) {
                        tableColumn.precision = numericPrecision;
                    }
                    else if (numericScale !== null &&
                        !this.isDefaultColumnScale(table, tableColumn, numericScale)) {
                        tableColumn.precision = undefined;
                    }
                    if (numericScale !== null &&
                        !this.isDefaultColumnScale(table, tableColumn, numericScale)) {
                        tableColumn.scale = numericScale;
                    }
                    else if (numericPrecision !== null &&
                        !this.isDefaultColumnPrecision(table, tableColumn, numericPrecision)) {
                        tableColumn.scale = undefined;
                    }
                }
                if (tableColumn.type === "interval" ||
                    tableColumn.type === "time without time zone" ||
                    tableColumn.type === "time with time zone" ||
                    tableColumn.type ===
                        "timestamp without time zone" ||
                    tableColumn.type === "timestamp with time zone") {
                    tableColumn.precision =
                        !this.isDefaultColumnPrecision(table, tableColumn, dbColumn["datetime_precision"])
                            ? dbColumn["datetime_precision"]
                            : undefined;
                }
                // check if column has user-defined data type.
                // NOTE: if ENUM type defined with "array:true" it comes with ARRAY type instead of USER-DEFINED
                if (dbColumn["data_type"] === "USER-DEFINED" ||
                    dbColumn["data_type"] === "ARRAY") {
                    const { name } = await this.getUserDefinedTypeName(table, tableColumn);
                    // check if `enumName` is specified by user
                    const builtEnumName = this.buildEnumName(table, tableColumn, false, true);
                    const enumName = builtEnumName !== name ? name : undefined;
                    // check if type is ENUM
                    const sql = `SELECT "e"."enumlabel" AS "value" FROM "pg_enum" "e" ` +
                        `INNER JOIN "pg_type" "t" ON "t"."oid" = "e"."enumtypid" ` +
                        `INNER JOIN "pg_namespace" "n" ON "n"."oid" = "t"."typnamespace" ` +
                        `WHERE "n"."nspname" = '${dbTable["table_schema"]}' AND "t"."typname" = '${enumName || name}'`;
                    const results = await this.query(sql);
                    if (results.length) {
                        tableColumn.type = "enum";
                        tableColumn.enum = results.map((result) => result["value"]);
                        tableColumn.enumName = enumName;
                    }
                    if (dbColumn["data_type"] === "ARRAY") {
                        tableColumn.isArray = true;
                        const type = tableColumn.type.replace("[]", "");
                        tableColumn.type =
                            this.connection.driver.normalizeType({
                                type: type,
                            });
                    }
                }
                if (tableColumn.type === "geometry" ||
                    tableColumn.type === "geography") {
                    const sql = `SELECT * FROM (` +
                        `SELECT "f_table_schema" "table_schema", "f_table_name" "table_name", ` +
                        `"f_${tableColumn.type}_column" "column_name", "srid", "type" ` +
                        `FROM "${tableColumn.type}_columns"` +
                        `) AS _ ` +
                        `WHERE "column_name" = '${dbColumn["column_name"]}' AND ` +
                        `"table_schema" = '${dbColumn["table_schema"]}' AND ` +
                        `"table_name" = '${dbColumn["table_name"]}'`;
                    const results = await this.query(sql);
                    if (results.length > 0) {
                        tableColumn.spatialFeatureType =
                            results[0].type;
                        tableColumn.srid = results[0].srid;
                    }
                }
                // check only columns that have length property
                if (this.driver.withLengthColumnTypes.indexOf(tableColumn.type) !== -1) {
                    let length;
                    if (tableColumn.isArray) {
                        const match = /\((\d+)\)/.exec(dbColumn["format_type"]);
                        length = match ? match[1] : undefined;
                    }
                    else if (dbColumn["character_maximum_length"]) {
                        length =
                            dbColumn["character_maximum_length"].toString();
                    }
                    if (length) {
                        tableColumn.length =
                            !this.isDefaultColumnLength(table, tableColumn, length)
                                ? length
                                : "";
                    }
                }
                tableColumn.isNullable =
                    dbColumn["is_nullable"] === "YES";
                const primaryConstraint = columnConstraints.find((constraint) => constraint["constraint_type"] === "PRIMARY");
                if (primaryConstraint) {
                    tableColumn.isPrimary = true;
                    // find another columns involved in primary key constraint
                    const anotherPrimaryConstraints = dbConstraints.filter((constraint) => constraint["table_name"] ===
                        dbColumn["table_name"] &&
                        constraint["table_schema"] ===
                            dbColumn["table_schema"] &&
                        constraint["column_name"] !==
                            dbColumn["column_name"] &&
                        constraint["constraint_type"] ===
                            "PRIMARY");
                    // collect all column names
                    const columnNames = anotherPrimaryConstraints.map((constraint) => constraint["column_name"]);
                    columnNames.push(dbColumn["column_name"]);
                    // build default primary key constraint name
                    const pkName = this.connection.namingStrategy.primaryKeyName(table, columnNames);
                    // if primary key has user-defined constraint name, write it in table column
                    if (primaryConstraint["constraint_name"] !==
                        pkName) {
                        tableColumn.primaryKeyConstraintName =
                            primaryConstraint["constraint_name"];
                    }
                }
                const uniqueConstraints = columnConstraints.filter((constraint) => constraint["constraint_type"] === "UNIQUE");
                const isConstraintComposite = uniqueConstraints.every((uniqueConstraint) => {
                    return dbConstraints.some((dbConstraint) => dbConstraint["constraint_type"] ===
                        "UNIQUE" &&
                        dbConstraint["constraint_name"] ===
                            uniqueConstraint["constraint_name"] &&
                        dbConstraint["column_name"] !==
                            dbColumn["column_name"]);
                });
                tableColumn.isUnique =
                    uniqueConstraints.length > 0 &&
                        !isConstraintComposite;
                if (dbColumn.is_identity === "YES") {
                    // Postgres 10+ Identity column
                    tableColumn.isGenerated = true;
                    tableColumn.generationStrategy = "identity";
                    tableColumn.generatedIdentity =
                        dbColumn.identity_generation;
                }
                else if (dbColumn["column_default"] !== null &&
                    dbColumn["column_default"] !== undefined) {
                    const serialDefaultName = `nextval('${this.buildSequenceName(table, dbColumn["column_name"])}'::regclass)`;
                    const serialDefaultPath = `nextval('${this.buildSequencePath(table, dbColumn["column_name"])}'::regclass)`;
                    const defaultWithoutQuotes = dbColumn["column_default"].replace(/"/g, "");
                    if (defaultWithoutQuotes ===
                        serialDefaultName ||
                        defaultWithoutQuotes === serialDefaultPath) {
                        tableColumn.isGenerated = true;
                        tableColumn.generationStrategy = "increment";
                    }
                    else if (dbColumn["column_default"] ===
                        "gen_random_uuid()" ||
                        /^uuid_generate_v\d\(\)/.test(dbColumn["column_default"])) {
                        if (tableColumn.type === "uuid") {
                            tableColumn.isGenerated = true;
                            tableColumn.generationStrategy = "uuid";
                        }
                        else {
                            tableColumn.default =
                                dbColumn["column_default"];
                        }
                    }
                    else if (dbColumn["column_default"] === "now()" ||
                        dbColumn["column_default"].indexOf("'now'::text") !== -1) {
                        tableColumn.default =
                            dbColumn["column_default"];
                    }
                    else {
                        tableColumn.default = dbColumn["column_default"].replace(/::[\w\s.[\]\-"]+/g, "");
                        tableColumn.default =
                            tableColumn.default.replace(/^(-?\d+)$/, "'$1'");
                    }
                }
                if (dbColumn["is_generated"] === "ALWAYS" &&
                    dbColumn["generation_expression"]) {
                    // In postgres there is no VIRTUAL generated column type
                    tableColumn.generatedType = "STORED";
                    // We cannot relay on information_schema.columns.generation_expression, because it is formatted different.
                    const asExpressionQuery = this.selectTypeormMetadataSql({
                        database: currentDatabase,
                        schema: dbTable["table_schema"],
                        table: dbTable["table_name"],
                        type: MetadataTableType.GENERATED_COLUMN,
                        name: tableColumn.name,
                    });
                    const results = await this.query(asExpressionQuery.query, asExpressionQuery.parameters);
                    if (results[0] && results[0].value) {
                        tableColumn.asExpression = results[0].value;
                    }
                    else {
                        tableColumn.asExpression = "";
                    }
                }
                tableColumn.comment = dbColumn["description"]
                    ? dbColumn["description"]
                    : undefined;
                if (dbColumn["character_set_name"])
                    tableColumn.charset =
                        dbColumn["character_set_name"];
                if (dbColumn["collation_name"])
                    tableColumn.collation =
                        dbColumn["collation_name"];
                return tableColumn;
            }));
            // find unique constraints of table, group them by constraint name and build TableUnique.
            const tableUniqueConstraints = OrmUtils.uniq(dbConstraints.filter((dbConstraint) => {
                return (dbConstraint["table_name"] ===
                    dbTable["table_name"] &&
                    dbConstraint["table_schema"] ===
                        dbTable["table_schema"] &&
                    dbConstraint["constraint_type"] === "UNIQUE");
            }), (dbConstraint) => dbConstraint["constraint_name"]);
            table.uniques = tableUniqueConstraints.map((constraint) => {
                const uniques = dbConstraints.filter((dbC) => dbC["constraint_name"] ===
                    constraint["constraint_name"]);
                return new TableUnique({
                    name: constraint["constraint_name"],
                    columnNames: uniques.map((u) => u["column_name"]),
                    deferrable: constraint["deferrable"]
                        ? constraint["deferred"]
                        : undefined,
                });
            });
            // find check constraints of table, group them by constraint name and build TableCheck.
            const tableCheckConstraints = OrmUtils.uniq(dbConstraints.filter((dbConstraint) => {
                return (dbConstraint["table_name"] ===
                    dbTable["table_name"] &&
                    dbConstraint["table_schema"] ===
                        dbTable["table_schema"] &&
                    dbConstraint["constraint_type"] === "CHECK");
            }), (dbConstraint) => dbConstraint["constraint_name"]);
            table.checks = tableCheckConstraints.map((constraint) => {
                const checks = dbConstraints.filter((dbC) => dbC["constraint_name"] ===
                    constraint["constraint_name"]);
                return new TableCheck({
                    name: constraint["constraint_name"],
                    columnNames: checks.map((c) => c["column_name"]),
                    expression: constraint["expression"].replace(/^\s*CHECK\s*\((.*)\)\s*$/i, "$1"),
                });
            });
            // find exclusion constraints of table, group them by constraint name and build TableExclusion.
            const tableExclusionConstraints = OrmUtils.uniq(dbConstraints.filter((dbConstraint) => {
                return (dbConstraint["table_name"] ===
                    dbTable["table_name"] &&
                    dbConstraint["table_schema"] ===
                        dbTable["table_schema"] &&
                    dbConstraint["constraint_type"] === "EXCLUDE");
            }), (dbConstraint) => dbConstraint["constraint_name"]);
            table.exclusions = tableExclusionConstraints.map((constraint) => {
                return new TableExclusion({
                    name: constraint["constraint_name"],
                    expression: constraint["expression"].substring(8), // trim EXCLUDE from start of expression
                });
            });
            // find foreign key constraints of table, group them by constraint name and build TableForeignKey.
            const tableForeignKeyConstraints = OrmUtils.uniq(dbForeignKeys.filter((dbForeignKey) => {
                return (dbForeignKey["table_name"] ===
                    dbTable["table_name"] &&
                    dbForeignKey["table_schema"] ===
                        dbTable["table_schema"]);
            }), (dbForeignKey) => dbForeignKey["constraint_name"]);
            table.foreignKeys = tableForeignKeyConstraints.map((dbForeignKey) => {
                const foreignKeys = dbForeignKeys.filter((dbFk) => dbFk["constraint_name"] ===
                    dbForeignKey["constraint_name"]);
                // if referenced table located in currently used schema, we don't need to concat schema name to table name.
                const schema = getSchemaFromKey(dbForeignKey, "referenced_table_schema");
                const referencedTableName = this.driver.buildTableName(dbForeignKey["referenced_table_name"], schema);
                return new TableForeignKey({
                    name: dbForeignKey["constraint_name"],
                    columnNames: foreignKeys.map((dbFk) => dbFk["column_name"]),
                    referencedSchema: dbForeignKey["referenced_table_schema"],
                    referencedTableName: referencedTableName,
                    referencedColumnNames: foreignKeys.map((dbFk) => dbFk["referenced_column_name"]),
                    onDelete: dbForeignKey["on_delete"],
                    onUpdate: dbForeignKey["on_update"],
                    deferrable: dbForeignKey["deferrable"]
                        ? dbForeignKey["deferred"]
                        : undefined,
                });
            });
            // find index constraints of table, group them by constraint name and build TableIndex.
            const tableIndexConstraints = OrmUtils.uniq(dbIndices.filter((dbIndex) => {
                return (dbIndex["table_name"] === dbTable["table_name"] &&
                    dbIndex["table_schema"] === dbTable["table_schema"]);
            }), (dbIndex) => dbIndex["constraint_name"]);
            table.indices = tableIndexConstraints.map((constraint) => {
                const indices = dbIndices.filter((index) => {
                    return (index["table_schema"] ===
                        constraint["table_schema"] &&
                        index["table_name"] === constraint["table_name"] &&
                        index["constraint_name"] ===
                            constraint["constraint_name"]);
                });
                return new TableIndex({
                    table: table,
                    name: constraint["constraint_name"],
                    columnNames: indices.map((i) => i["column_name"]),
                    isUnique: constraint["is_unique"] === "TRUE",
                    where: constraint["condition"],
                    isSpatial: constraint["index_type"] === "gist",
                    isFulltext: false,
                });
            });
            return table;
        }));
    }
    /**
     * Builds create table sql.
     */
    createTableSql(table, createForeignKeys) {
        const columnDefinitions = table.columns
            .map((column) => this.buildCreateColumnSql(table, column))
            .join(", ");
        let sql = `CREATE TABLE ${this.escapePath(table)} (${columnDefinitions}`;
        table.columns
            .filter((column) => column.isUnique)
            .forEach((column) => {
            const isUniqueExist = table.uniques.some((unique) => unique.columnNames.length === 1 &&
                unique.columnNames[0] === column.name);
            if (!isUniqueExist)
                table.uniques.push(new TableUnique({
                    name: this.connection.namingStrategy.uniqueConstraintName(table, [column.name]),
                    columnNames: [column.name],
                }));
        });
        if (table.uniques.length > 0) {
            const uniquesSql = table.uniques
                .map((unique) => {
                const uniqueName = unique.name
                    ? unique.name
                    : this.connection.namingStrategy.uniqueConstraintName(table, unique.columnNames);
                const columnNames = unique.columnNames
                    .map((columnName) => `"${columnName}"`)
                    .join(", ");
                let constraint = `CONSTRAINT "${uniqueName}" UNIQUE (${columnNames})`;
                if (unique.deferrable)
                    constraint += ` DEFERRABLE ${unique.deferrable}`;
                return constraint;
            })
                .join(", ");
            sql += `, ${uniquesSql}`;
        }
        if (table.checks.length > 0) {
            const checksSql = table.checks
                .map((check) => {
                const checkName = check.name
                    ? check.name
                    : this.connection.namingStrategy.checkConstraintName(table, check.expression);
                return `CONSTRAINT "${checkName}" CHECK (${check.expression})`;
            })
                .join(", ");
            sql += `, ${checksSql}`;
        }
        if (table.exclusions.length > 0) {
            const exclusionsSql = table.exclusions
                .map((exclusion) => {
                const exclusionName = exclusion.name
                    ? exclusion.name
                    : this.connection.namingStrategy.exclusionConstraintName(table, exclusion.expression);
                return `CONSTRAINT "${exclusionName}" EXCLUDE ${exclusion.expression}`;
            })
                .join(", ");
            sql += `, ${exclusionsSql}`;
        }
        if (table.foreignKeys.length > 0 && createForeignKeys) {
            const foreignKeysSql = table.foreignKeys
                .map((fk) => {
                const columnNames = fk.columnNames
                    .map((columnName) => `"${columnName}"`)
                    .join(", ");
                if (!fk.name)
                    fk.name = this.connection.namingStrategy.foreignKeyName(table, fk.columnNames, this.getTablePath(fk), fk.referencedColumnNames);
                const referencedColumnNames = fk.referencedColumnNames
                    .map((columnName) => `"${columnName}"`)
                    .join(", ");
                let constraint = `CONSTRAINT "${fk.name}" FOREIGN KEY (${columnNames}) REFERENCES ${this.escapePath(this.getTablePath(fk))} (${referencedColumnNames})`;
                if (fk.onDelete)
                    constraint += ` ON DELETE ${fk.onDelete}`;
                if (fk.onUpdate)
                    constraint += ` ON UPDATE ${fk.onUpdate}`;
                if (fk.deferrable)
                    constraint += ` DEFERRABLE ${fk.deferrable}`;
                return constraint;
            })
                .join(", ");
            sql += `, ${foreignKeysSql}`;
        }
        const primaryColumns = table.columns.filter((column) => column.isPrimary);
        if (primaryColumns.length > 0) {
            const primaryKeyName = primaryColumns[0].primaryKeyConstraintName
                ? primaryColumns[0].primaryKeyConstraintName
                : this.connection.namingStrategy.primaryKeyName(table, primaryColumns.map((column) => column.name));
            const columnNames = primaryColumns
                .map((column) => `"${column.name}"`)
                .join(", ");
            sql += `, CONSTRAINT "${primaryKeyName}" PRIMARY KEY (${columnNames})`;
        }
        sql += `)`;
        table.columns
            .filter((it) => it.comment)
            .forEach((it) => (sql += `; COMMENT ON COLUMN ${this.escapePath(table)}."${it.name}" IS ${this.escapeComment(it.comment)}`));
        return new Query(sql);
    }
    /**
     * Loads Postgres version.
     */
    async getVersion() {
        // we use `SELECT version()` instead of `SHOW server_version` or `SHOW server_version_num`
        // to maintain compatability with Amazon Redshift.
        //
        // see:
        //  - https://github.com/typeorm/typeorm/pull/9319
        //  - https://docs.aws.amazon.com/redshift/latest/dg/c_unsupported-postgresql-functions.html
        const result = await this.query(`SELECT version()`);
        // Examples:
        // Postgres: "PostgreSQL 14.10 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-20), 64-bit"
        // Yugabyte: "PostgreSQL 11.2-YB-2.18.1.0-b0 on x86_64-pc-linux-gnu, compiled by clang version 15.0.3 (https://github.com/yugabyte/llvm-project.git 0b8d1183745fd3998d8beffeec8cbe99c1b20529), 64-bit"
        return result[0].version.replace(/^PostgreSQL ([\d.]+).*$/, "$1");
    }
    /**
     * Builds drop table sql.
     */
    dropTableSql(tableOrPath) {
        return new Query(`DROP TABLE ${this.escapePath(tableOrPath)}`);
    }
    createViewSql(view) {
        const materializedClause = view.materialized ? "MATERIALIZED " : "";
        const viewName = this.escapePath(view);
        if (typeof view.expression === "string") {
            return new Query(`CREATE ${materializedClause}VIEW ${viewName} AS ${view.expression}`);
        }
        else {
            return new Query(`CREATE ${materializedClause}VIEW ${viewName} AS ${view
                .expression(this.connection)
                .getQuery()}`);
        }
    }
    async insertViewDefinitionSql(view) {
        const currentSchema = await this.getCurrentSchema();
        let { schema, tableName: name } = this.driver.parseTableName(view);
        if (!schema) {
            schema = currentSchema;
        }
        const type = view.materialized
            ? MetadataTableType.MATERIALIZED_VIEW
            : MetadataTableType.VIEW;
        const expression = typeof view.expression === "string"
            ? view.expression.trim()
            : view.expression(this.connection).getQuery();
        return this.insertTypeormMetadataSql({
            type,
            schema,
            name,
            value: expression,
        });
    }
    /**
     * Builds drop view sql.
     */
    dropViewSql(view) {
        const materializedClause = view.materialized ? "MATERIALIZED " : "";
        return new Query(`DROP ${materializedClause}VIEW ${this.escapePath(view)}`);
    }
    /**
     * Builds remove view sql.
     */
    async deleteViewDefinitionSql(view) {
        const currentSchema = await this.getCurrentSchema();
        let { schema, tableName: name } = this.driver.parseTableName(view);
        if (!schema) {
            schema = currentSchema;
        }
        const type = view.materialized
            ? MetadataTableType.MATERIALIZED_VIEW
            : MetadataTableType.VIEW;
        return this.deleteTypeormMetadataSql({ type, schema, name });
    }
    /**
     * Drops ENUM type from given schemas.
     */
    async dropEnumTypes(schemaNames) {
        const selectDropsQuery = `SELECT 'DROP TYPE IF EXISTS "' || n.nspname || '"."' || t.typname || '" CASCADE;' as "query" FROM "pg_type" "t" ` +
            `INNER JOIN "pg_enum" "e" ON "e"."enumtypid" = "t"."oid" ` +
            `INNER JOIN "pg_namespace" "n" ON "n"."oid" = "t"."typnamespace" ` +
            `WHERE "n"."nspname" IN (${schemaNames}) GROUP BY "n"."nspname", "t"."typname"`;
        const dropQueries = await this.query(selectDropsQuery);
        await Promise.all(dropQueries.map((q) => this.query(q["query"])));
    }
    /**
     * Checks if enum with the given name exist in the database.
     */
    async hasEnumType(table, column) {
        let { schema } = this.driver.parseTableName(table);
        if (!schema) {
            schema = await this.getCurrentSchema();
        }
        const enumName = this.buildEnumName(table, column, false, true);
        const sql = `SELECT "n"."nspname", "t"."typname" FROM "pg_type" "t" ` +
            `INNER JOIN "pg_namespace" "n" ON "n"."oid" = "t"."typnamespace" ` +
            `WHERE "n"."nspname" = '${schema}' AND "t"."typname" = '${enumName}'`;
        const result = await this.query(sql);
        return result.length ? true : false;
    }
    /**
     * Builds create ENUM type sql.
     */
    createEnumTypeSql(table, column, enumName) {
        if (!enumName)
            enumName = this.buildEnumName(table, column);
        const enumValues = column
            .enum.map((value) => `'${value.replaceAll("'", "''")}'`)
            .join(", ");
        return new Query(`CREATE TYPE ${enumName} AS ENUM(${enumValues})`);
    }
    /**
     * Builds create ENUM type sql.
     */
    dropEnumTypeSql(table, column, enumName) {
        if (!enumName)
            enumName = this.buildEnumName(table, column);
        return new Query(`DROP TYPE ${enumName}`);
    }
    /**
     * Builds create index sql.
     */
    createIndexSql(table, index) {
        const columns = index.columnNames
            .map((columnName) => `"${columnName}"`)
            .join(", ");
        return new Query(`CREATE ${index.isUnique ? "UNIQUE " : ""}INDEX${index.isConcurrent ? " CONCURRENTLY" : ""} "${index.name}" ON ${this.escapePath(table)} ${index.isSpatial ? "USING GiST " : ""}(${columns}) ${index.where ? "WHERE " + index.where : ""}`);
    }
    /**
     * Builds create view index sql.
     */
    createViewIndexSql(view, index) {
        const columns = index.columnNames
            .map((columnName) => `"${columnName}"`)
            .join(", ");
        return new Query(`CREATE ${index.isUnique ? "UNIQUE " : ""}INDEX "${index.name}" ON ${this.escapePath(view)} (${columns}) ${index.where ? "WHERE " + index.where : ""}`);
    }
    /**
     * Builds drop index sql.
     */
    dropIndexSql(table, indexOrName) {
        const indexName = InstanceChecker.isTableIndex(indexOrName)
            ? indexOrName.name
            : indexOrName;
        const concurrent = InstanceChecker.isTableIndex(indexOrName)
            ? indexOrName.isConcurrent
            : false;
        const { schema } = this.driver.parseTableName(table);
        return schema
            ? new Query(`DROP INDEX ${concurrent ? "CONCURRENTLY " : ""}"${schema}"."${indexName}"`)
            : new Query(`DROP INDEX ${concurrent ? "CONCURRENTLY " : ""}"${indexName}"`);
    }
    /**
     * Builds create primary key sql.
     */
    createPrimaryKeySql(table, columnNames, constraintName) {
        const primaryKeyName = constraintName
            ? constraintName
            : this.connection.namingStrategy.primaryKeyName(table, columnNames);
        const columnNamesString = columnNames
            .map((columnName) => `"${columnName}"`)
            .join(", ");
        return new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${primaryKeyName}" PRIMARY KEY (${columnNamesString})`);
    }
    /**
     * Builds drop primary key sql.
     */
    dropPrimaryKeySql(table) {
        if (!table.primaryColumns.length)
            throw new TypeORMError(`Table ${table} has no primary keys.`);
        const columnNames = table.primaryColumns.map((column) => column.name);
        const constraintName = table.primaryColumns[0].primaryKeyConstraintName;
        const primaryKeyName = constraintName
            ? constraintName
            : this.connection.namingStrategy.primaryKeyName(table, columnNames);
        return new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${primaryKeyName}"`);
    }
    /**
     * Builds create unique constraint sql.
     */
    createUniqueConstraintSql(table, uniqueConstraint) {
        const columnNames = uniqueConstraint.columnNames
            .map((column) => `"` + column + `"`)
            .join(", ");
        let sql = `ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${uniqueConstraint.name}" UNIQUE (${columnNames})`;
        if (uniqueConstraint.deferrable)
            sql += ` DEFERRABLE ${uniqueConstraint.deferrable}`;
        return new Query(sql);
    }
    /**
     * Builds drop unique constraint sql.
     */
    dropUniqueConstraintSql(table, uniqueOrName) {
        const uniqueName = InstanceChecker.isTableUnique(uniqueOrName)
            ? uniqueOrName.name
            : uniqueOrName;
        return new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${uniqueName}"`);
    }
    /**
     * Builds create check constraint sql.
     */
    createCheckConstraintSql(table, checkConstraint) {
        return new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${checkConstraint.name}" CHECK (${checkConstraint.expression})`);
    }
    /**
     * Builds drop check constraint sql.
     */
    dropCheckConstraintSql(table, checkOrName) {
        const checkName = InstanceChecker.isTableCheck(checkOrName)
            ? checkOrName.name
            : checkOrName;
        return new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${checkName}"`);
    }
    /**
     * Builds create exclusion constraint sql.
     */
    createExclusionConstraintSql(table, exclusionConstraint) {
        return new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${exclusionConstraint.name}" EXCLUDE ${exclusionConstraint.expression}`);
    }
    /**
     * Builds drop exclusion constraint sql.
     */
    dropExclusionConstraintSql(table, exclusionOrName) {
        const exclusionName = InstanceChecker.isTableExclusion(exclusionOrName)
            ? exclusionOrName.name
            : exclusionOrName;
        return new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${exclusionName}"`);
    }
    /**
     * Builds create foreign key sql.
     */
    createForeignKeySql(table, foreignKey) {
        const columnNames = foreignKey.columnNames
            .map((column) => `"` + column + `"`)
            .join(", ");
        const referencedColumnNames = foreignKey.referencedColumnNames
            .map((column) => `"` + column + `"`)
            .join(",");
        let sql = `ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${foreignKey.name}" FOREIGN KEY (${columnNames}) ` +
            `REFERENCES ${this.escapePath(this.getTablePath(foreignKey))}(${referencedColumnNames})`;
        if (foreignKey.onDelete)
            sql += ` ON DELETE ${foreignKey.onDelete}`;
        if (foreignKey.onUpdate)
            sql += ` ON UPDATE ${foreignKey.onUpdate}`;
        if (foreignKey.deferrable)
            sql += ` DEFERRABLE ${foreignKey.deferrable}`;
        return new Query(sql);
    }
    /**
     * Builds drop foreign key sql.
     */
    dropForeignKeySql(table, foreignKeyOrName) {
        const foreignKeyName = InstanceChecker.isTableForeignKey(foreignKeyOrName)
            ? foreignKeyOrName.name
            : foreignKeyOrName;
        return new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${foreignKeyName}"`);
    }
    /**
     * Builds sequence name from given table and column.
     */
    buildSequenceName(table, columnOrName) {
        const { tableName } = this.driver.parseTableName(table);
        const columnName = InstanceChecker.isTableColumn(columnOrName)
            ? columnOrName.name
            : columnOrName;
        let seqName = `${tableName}_${columnName}_seq`;
        if (seqName.length > this.connection.driver.maxAliasLength) {
            // note doesn't yet handle corner cases where .length differs from number of UTF-8 bytes
            seqName = `${tableName.substring(0, 29)}_${columnName.substring(0, Math.max(29, 63 - table.name.length - 5))}_seq`;
        }
        return seqName;
    }
    buildSequencePath(table, columnOrName) {
        const { schema } = this.driver.parseTableName(table);
        return schema
            ? `${schema}.${this.buildSequenceName(table, columnOrName)}`
            : this.buildSequenceName(table, columnOrName);
    }
    /**
     * Builds ENUM type name from given table and column.
     */
    buildEnumName(table, column, withSchema = true, disableEscape, toOld) {
        const { schema, tableName } = this.driver.parseTableName(table);
        let enumName = column.enumName
            ? column.enumName
            : `${tableName}_${column.name.toLowerCase()}_enum`;
        if (schema && withSchema)
            enumName = `${schema}.${enumName}`;
        if (toOld)
            enumName = enumName + "_old";
        return enumName
            .split(".")
            .map((i) => {
            return disableEscape ? i : `"${i}"`;
        })
            .join(".");
    }
    async getUserDefinedTypeName(table, column) {
        let { schema, tableName: name } = this.driver.parseTableName(table);
        if (!schema) {
            schema = await this.getCurrentSchema();
        }
        const result = await this.query(`SELECT "udt_schema", "udt_name" ` +
            `FROM "information_schema"."columns" WHERE "table_schema" = '${schema}' AND "table_name" = '${name}' AND "column_name"='${column.name}'`);
        // docs: https://www.postgresql.org/docs/current/xtypes.html
        // When you define a new base type, PostgreSQL automatically provides support for arrays of that type.
        // The array type typically has the same name as the base type with the underscore character (_) prepended.
        // ----
        // so, we must remove this underscore character from enum type name
        let udtName = result[0]["udt_name"];
        if (udtName.indexOf("_") === 0) {
            udtName = udtName.substr(1, udtName.length);
        }
        return {
            schema: result[0]["udt_schema"],
            name: udtName,
        };
    }
    /**
     * Escapes a given comment so it's safe to include in a query.
     */
    escapeComment(comment) {
        if (!comment || comment.length === 0) {
            return "NULL";
        }
        comment = comment.replace(/'/g, "''").replace(/\u0000/g, ""); // Null bytes aren't allowed in comments
        return `'${comment}'`;
    }
    /**
     * Escapes given table or view path.
     */
    escapePath(target) {
        const { schema, tableName } = this.driver.parseTableName(target);
        if (schema && schema !== this.driver.searchSchema) {
            return `"${schema}"."${tableName}"`;
        }
        return `"${tableName}"`;
    }
    /**
     * Get the table name with table schema
     * Note: Without ' or "
     */
    async getTableNameWithSchema(target) {
        const tableName = InstanceChecker.isTable(target) ? target.name : target;
        if (tableName.indexOf(".") === -1) {
            const schemaResult = await this.query(`SELECT current_schema()`);
            const schema = schemaResult[0]["current_schema"];
            return `${schema}.${tableName}`;
        }
        else {
            return `${tableName.split(".")[0]}.${tableName.split(".")[1]}`;
        }
    }
    /**
     * Builds a query for create column.
     */
    buildCreateColumnSql(table, column) {
        let c = '"' + column.name + '"';
        if (column.isGenerated === true &&
            column.generationStrategy !== "uuid") {
            if (column.generationStrategy === "identity") {
                // Postgres 10+ Identity generated column
                const generatedIdentityOrDefault = column.generatedIdentity || "BY DEFAULT";
                c += ` ${column.type} GENERATED ${generatedIdentityOrDefault} AS IDENTITY`;
            }
            else {
                // classic SERIAL primary column
                if (column.type === "integer" ||
                    column.type === "int" ||
                    column.type === "int4")
                    c += " SERIAL";
                if (column.type === "smallint" || column.type === "int2")
                    c += " SMALLSERIAL";
                if (column.type === "bigint" || column.type === "int8")
                    c += " BIGSERIAL";
            }
        }
        if (column.type === "enum" || column.type === "simple-enum") {
            c += " " + this.buildEnumName(table, column);
            if (column.isArray)
                c += " array";
        }
        else if (!column.isGenerated || column.type === "uuid") {
            c += " " + this.connection.driver.createFullType(column);
        }
        // Postgres only supports the stored generated column type
        if (column.generatedType === "STORED" && column.asExpression) {
            c += ` GENERATED ALWAYS AS (${column.asExpression}) STORED`;
        }
        if (column.charset)
            c += ' CHARACTER SET "' + column.charset + '"';
        if (column.collation)
            c += ' COLLATE "' + column.collation + '"';
        if (column.isNullable !== true)
            c += " NOT NULL";
        if (column.default !== undefined && column.default !== null)
            c += " DEFAULT " + column.default;
        if (column.isGenerated &&
            column.generationStrategy === "uuid" &&
            !column.default)
            c += ` DEFAULT ${this.driver.uuidGenerator}`;
        return c;
    }
    /**
     * Checks if the PostgreSQL server has support for partitioned tables
     */
    async hasSupportForPartitionedTables() {
        const result = await this.query(`SELECT TRUE FROM information_schema.columns WHERE table_name = 'pg_class' and column_name = 'relispartition'`);
        return result.length ? true : false;
    }
    /**
     * Change table comment.
     */
    async changeTableComment(tableOrName, newComment) {
        const upQueries = [];
        const downQueries = [];
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        newComment = this.escapeComment(newComment);
        const comment = this.escapeComment(table.comment);
        if (newComment === comment) {
            return;
        }
        const newTable = table.clone();
        upQueries.push(new Query(`COMMENT ON TABLE ${this.escapePath(newTable)} IS ${newComment}`));
        downQueries.push(new Query(`COMMENT ON TABLE ${this.escapePath(table)} IS ${comment}`));
        await this.executeQueries(upQueries, downQueries);
        table.comment = newTable.comment;
        this.replaceCachedTable(table, newTable);
    }
}

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