Add initial version of dijkstra backend cloudron image

node_modules/knex/lib/dialects/postgres/index.js

@@ -0,0 +1,321 @@
+// PostgreSQL
+// -------
+const { map, extend, isString } = require('lodash');
+const { promisify } = require('util');
+const inherits = require('inherits');
+const Client = require('../../client');
+const Bluebird = require('bluebird');
+
+const QueryCompiler = require('./query/compiler');
+const ColumnCompiler = require('./schema/columncompiler');
+const TableCompiler = require('./schema/tablecompiler');
+const SchemaCompiler = require('./schema/compiler');
+const { makeEscape } = require('../../query/string');
+
+function Client_PG(config) {
+  Client.apply(this, arguments);
+  if (config.returning) {
+    this.defaultReturning = config.returning;
+  }
+
+  if (config.searchPath) {
+    this.searchPath = config.searchPath;
+  }
+}
+inherits(Client_PG, Client);
+
+Object.assign(Client_PG.prototype, {
+  queryCompiler() {
+    return new QueryCompiler(this, ...arguments);
+  },
+
+  columnCompiler() {
+    return new ColumnCompiler(this, ...arguments);
+  },
+
+  schemaCompiler() {
+    return new SchemaCompiler(this, ...arguments);
+  },
+
+  tableCompiler() {
+    return new TableCompiler(this, ...arguments);
+  },
+
+  dialect: 'postgresql',
+
+  driverName: 'pg',
+
+  _driver() {
+    return require('pg');
+  },
+
+  _escapeBinding: makeEscape({
+    escapeArray(val, esc) {
+      return esc(arrayString(val, esc));
+    },
+    escapeString(str) {
+      let hasBackslash = false;
+      let escaped = "'";
+      for (let i = 0; i < str.length; i++) {
+        const c = str[i];
+        if (c === "'") {
+          escaped += c + c;
+        } else if (c === '\\') {
+          escaped += c + c;
+          hasBackslash = true;
+        } else {
+          escaped += c;
+        }
+      }
+      escaped += "'";
+      if (hasBackslash === true) {
+        escaped = 'E' + escaped;
+      }
+      return escaped;
+    },
+    escapeObject(val, prepareValue, timezone, seen = []) {
+      if (val && typeof val.toPostgres === 'function') {
+        seen = seen || [];
+        if (seen.indexOf(val) !== -1) {
+          throw new Error(
+            `circular reference detected while preparing "${val}" for query`
+          );
+        }
+        seen.push(val);
+        return prepareValue(val.toPostgres(prepareValue), seen);
+      }
+      return JSON.stringify(val);
+    },
+  }),
+
+  wrapIdentifierImpl(value) {
+    if (value === '*') return value;
+
+    let arrayAccessor = '';
+    const arrayAccessorMatch = value.match(/(.*?)(\[[0-9]+\])/);
+
+    if (arrayAccessorMatch) {
+      value = arrayAccessorMatch[1];
+      arrayAccessor = arrayAccessorMatch[2];
+    }
+
+    return `"${value.replace(/"/g, '""')}"${arrayAccessor}`;
+  },
+
+  // Get a raw connection, called by the `pool` whenever a new
+  // connection needs to be added to the pool.
+  acquireRawConnection() {
+    const client = this;
+    return new Bluebird(function(resolver, rejecter) {
+      const connection = new client.driver.Client(client.connectionSettings);
+      connection.connect(function(err, connection) {
+        if (err) {
+          return rejecter(err);
+        }
+        connection.on('error', (err) => {
+          connection.__knex__disposed = err;
+        });
+        connection.on('end', (err) => {
+          connection.__knex__disposed = err || 'Connection ended unexpectedly';
+        });
+        if (!client.version) {
+          return client.checkVersion(connection).then(function(version) {
+            client.version = version;
+            resolver(connection);
+          });
+        }
+        resolver(connection);
+      });
+    }).then(function setSearchPath(connection) {
+      client.setSchemaSearchPath(connection);
+      return connection;
+    });
+  },
+
+  // Used to explicitly close a connection, called internally by the pool
+  // when a connection times out or the pool is shutdown.
+  async destroyRawConnection(connection) {
+    const end = promisify((cb) => connection.end(cb));
+    return end();
+  },
+
+  // In PostgreSQL, we need to do a version check to do some feature
+  // checking on the database.
+  checkVersion(connection) {
+    return new Bluebird(function(resolver, rejecter) {
+      connection.query('select version();', function(err, resp) {
+        if (err) return rejecter(err);
+        resolver(/^PostgreSQL (.*?)( |$)/.exec(resp.rows[0].version)[1]);
+      });
+    });
+  },
+
+  // Position the bindings for the query. The escape sequence for question mark
+  // is \? (e.g. knex.raw("\\?") since javascript requires '\' to be escaped too...)
+  positionBindings(sql) {
+    let questionCount = 0;
+    return sql.replace(/(\\*)(\?)/g, function(match, escapes) {
+      if (escapes.length % 2) {
+        return '?';
+      } else {
+        questionCount++;
+        return `$${questionCount}`;
+      }
+    });
+  },
+
+  setSchemaSearchPath(connection, searchPath) {
+    let path = searchPath || this.searchPath;
+
+    if (!path) return Bluebird.resolve(true);
+
+    if (!Array.isArray(path) && !isString(path)) {
+      throw new TypeError(
+        `knex: Expected searchPath to be Array/String, got: ${typeof path}`
+      );
+    }
+
+    if (isString(path)) {
+      if (path.includes(',')) {
+        const parts = path.split(',');
+        const arraySyntax = `[${parts
+          .map((searchPath) => `'${searchPath}'`)
+          .join(', ')}]`;
+        this.logger.warn(
+          `Detected comma in searchPath "${path}".` +
+            `If you are trying to specify multiple schemas, use Array syntax: ${arraySyntax}`
+        );
+      }
+      path = [path];
+    }
+
+    path = path.map((schemaName) => `"${schemaName}"`).join(',');
+
+    return new Bluebird(function(resolver, rejecter) {
+      connection.query(`set search_path to ${path}`, function(err) {
+        if (err) return rejecter(err);
+        resolver(true);
+      });
+    });
+  },
+
+  _stream(connection, obj, stream, options) {
+    const PGQueryStream = process.browser
+      ? undefined
+      : require('pg-query-stream');
+    const sql = obj.sql;
+
+    return new Bluebird(function(resolver, rejecter) {
+      const queryStream = connection.query(
+        new PGQueryStream(sql, obj.bindings, options)
+      );
+
+      queryStream.on('error', function(error) {
+        rejecter(error);
+        stream.emit('error', error);
+      });
+
+      // 'end' IS propagated by .pipe, by default
+      stream.on('end', resolver);
+      queryStream.pipe(stream);
+    });
+  },
+
+  // Runs the query on the specified connection, providing the bindings
+  // and any other necessary prep work.
+  _query(connection, obj) {
+    let queryConfig = {
+      text: obj.sql,
+      values: obj.bindings || [],
+    };
+
+    if (obj.options) {
+      queryConfig = extend(queryConfig, obj.options);
+    }
+
+    return new Bluebird(function(resolver, rejecter) {
+      connection.query(queryConfig, function(err, response) {
+        if (err) return rejecter(err);
+        obj.response = response;
+        resolver(obj);
+      });
+    });
+  },
+
+  // Ensures the response is returned in the same format as other clients.
+  processResponse(obj, runner) {
+    const resp = obj.response;
+    if (obj.output) return obj.output.call(runner, resp);
+    if (obj.method === 'raw') return resp;
+    const { returning } = obj;
+    if (resp.command === 'SELECT') {
+      if (obj.method === 'first') return resp.rows[0];
+      if (obj.method === 'pluck') return map(resp.rows, obj.pluck);
+      return resp.rows;
+    }
+    if (returning) {
+      const returns = [];
+      for (let i = 0, l = resp.rows.length; i < l; i++) {
+        const row = resp.rows[i];
+        if (returning === '*' || Array.isArray(returning)) {
+          returns[i] = row;
+        } else {
+          // Pluck the only column in the row.
+          returns[i] = row[Object.keys(row)[0]];
+        }
+      }
+      return returns;
+    }
+    if (resp.command === 'UPDATE' || resp.command === 'DELETE') {
+      return resp.rowCount;
+    }
+    return resp;
+  },
+
+  canCancelQuery: true,
+  cancelQuery(connectionToKill) {
+    const acquiringConn = this.acquireConnection();
+
+    // Error out if we can't acquire connection in time.
+    // Purposely not putting timeout on `pg_cancel_backend` execution because erroring
+    // early there would release the `connectionToKill` back to the pool with
+    // a `KILL QUERY` command yet to finish.
+    return acquiringConn.then((conn) => {
+      return this._wrappedCancelQueryCall(conn, connectionToKill).finally(
+        () => {
+          // NOT returning this promise because we want to release the connection
+          // in a non-blocking fashion
+          this.releaseConnection(conn);
+        }
+      );
+    });
+  },
+  _wrappedCancelQueryCall(conn, connectionToKill) {
+    return this.query(conn, {
+      method: 'raw',
+      sql: 'SELECT pg_cancel_backend(?);',
+      bindings: [connectionToKill.processID],
+      options: {},
+    });
+  },
+});
+
+function arrayString(arr, esc) {
+  let result = '{';
+  for (let i = 0; i < arr.length; i++) {
+    if (i > 0) result += ',';
+    const val = arr[i];
+    if (val === null || typeof val === 'undefined') {
+      result += 'NULL';
+    } else if (Array.isArray(val)) {
+      result += arrayString(val, esc);
+    } else if (typeof val === 'number') {
+      result += val;
+    } else {
+      result += JSON.stringify(typeof val === 'string' ? val : esc(val));
+    }
+  }
+  return result + '}';
+}
+
+module.exports = Client_PG;

node_modules/knex/lib/dialects/postgres/query/compiler.js

@@ -0,0 +1,166 @@
+// PostgreSQL Query Builder & Compiler
+// ------
+const inherits = require('inherits');
+
+const QueryCompiler = require('../../../query/compiler');
+
+const { reduce, identity } = require('lodash');
+
+function QueryCompiler_PG(client, builder) {
+  QueryCompiler.call(this, client, builder);
+}
+
+inherits(QueryCompiler_PG, QueryCompiler);
+
+Object.assign(QueryCompiler_PG.prototype, {
+  // Compiles a truncate query.
+  truncate() {
+    return `truncate ${this.tableName} restart identity`;
+  },
+
+  // is used if the an array with multiple empty values supplied
+  _defaultInsertValue: 'default',
+
+  // Compiles an `insert` query, allowing for multiple
+  // inserts using a single query statement.
+  insert() {
+    const sql = QueryCompiler.prototype.insert.call(this);
+    if (sql === '') return sql;
+    const { returning } = this.single;
+    return {
+      sql: sql + this._returning(returning),
+      returning,
+    };
+  },
+
+  // Compiles an `update` query, allowing for a return value.
+  update() {
+    const withSQL = this.with();
+    const updateData = this._prepUpdate(this.single.update);
+    const wheres = this.where();
+    const { returning } = this.single;
+    return {
+      sql:
+        withSQL +
+        `update ${this.single.only ? 'only ' : ''}${this.tableName} ` +
+        `set ${updateData.join(', ')}` +
+        (wheres ? ` ${wheres}` : '') +
+        this._returning(returning),
+      returning,
+    };
+  },
+
+  // Compiles an `update` query, allowing for a return value.
+  del() {
+    const sql = QueryCompiler.prototype.del.apply(this, arguments);
+    const { returning } = this.single;
+    return {
+      sql: sql + this._returning(returning),
+      returning,
+    };
+  },
+
+  aggregate(stmt) {
+    return this._aggregate(stmt, { distinctParentheses: true });
+  },
+
+  _returning(value) {
+    return value ? ` returning ${this.formatter.columnize(value)}` : '';
+  },
+
+  // Join array of table names and apply default schema.
+  _tableNames(tables) {
+    const schemaName = this.single.schema;
+    const sql = [];
+
+    for (let i = 0; i < tables.length; i++) {
+      let tableName = tables[i];
+
+      if (tableName) {
+        if (schemaName) {
+          tableName = `${schemaName}.${tableName}`;
+        }
+        sql.push(this.formatter.wrap(tableName));
+      }
+    }
+
+    return sql.join(', ');
+  },
+
+  forUpdate() {
+    const tables = this.single.lockTables || [];
+
+    return (
+      'for update' + (tables.length ? ' of ' + this._tableNames(tables) : '')
+    );
+  },
+
+  forShare() {
+    const tables = this.single.lockTables || [];
+
+    return (
+      'for share' + (tables.length ? ' of ' + this._tableNames(tables) : '')
+    );
+  },
+
+  skipLocked() {
+    return 'skip locked';
+  },
+
+  noWait() {
+    return 'nowait';
+  },
+
+  // Compiles a columnInfo query
+  columnInfo() {
+    const column = this.single.columnInfo;
+    let schema = this.single.schema;
+
+    // The user may have specified a custom wrapIdentifier function in the config. We
+    // need to run the identifiers through that function, but not format them as
+    // identifiers otherwise.
+    const table = this.client.customWrapIdentifier(this.single.table, identity);
+
+    if (schema) {
+      schema = this.client.customWrapIdentifier(schema, identity);
+    }
+
+    let sql =
+      'select * from information_schema.columns where table_name = ? and table_catalog = ?';
+    const bindings = [table, this.client.database()];
+
+    if (schema) {
+      sql += ' and table_schema = ?';
+      bindings.push(schema);
+    } else {
+      sql += ' and table_schema = current_schema()';
+    }
+
+    return {
+      sql,
+      bindings,
+      output(resp) {
+        const out = reduce(
+          resp.rows,
+          function(columns, val) {
+            columns[val.column_name] = {
+              type: val.data_type,
+              maxLength: val.character_maximum_length,
+              nullable: val.is_nullable === 'YES',
+              defaultValue: val.column_default,
+            };
+            return columns;
+          },
+          {}
+        );
+        return (column && out[column]) || out;
+      },
+    };
+  },
+
+  distinctOn(value) {
+    return 'distinct on (' + this.formatter.columnize(value) + ') ';
+  },
+});
+
+module.exports = QueryCompiler_PG;

node_modules/knex/lib/dialects/postgres/schema/columncompiler.js

@@ -0,0 +1,122 @@
+// PostgreSQL Column Compiler
+// -------
+
+const inherits = require('inherits');
+const ColumnCompiler = require('../../../schema/columncompiler');
+const { isObject } = require('lodash');
+
+function ColumnCompiler_PG() {
+  ColumnCompiler.apply(this, arguments);
+  this.modifiers = ['nullable', 'defaultTo', 'comment'];
+}
+inherits(ColumnCompiler_PG, ColumnCompiler);
+
+Object.assign(ColumnCompiler_PG.prototype, {
+  // Types
+  // ------
+  bigincrements: 'bigserial primary key',
+  bigint: 'bigint',
+  binary: 'bytea',
+
+  bit(column) {
+    return column.length !== false ? `bit(${column.length})` : 'bit';
+  },
+
+  bool: 'boolean',
+
+  // Create the column definition for an enum type.
+  // Using method "2" here: http://stackoverflow.com/a/10984951/525714
+  enu(allowed, options) {
+    options = options || {};
+
+    const values =
+      options.useNative && options.existingType
+        ? undefined
+        : allowed.join("', '");
+
+    if (options.useNative) {
+      let enumName = '';
+      const schemaName = options.schemaName || this.tableCompiler.schemaNameRaw;
+
+      if (schemaName) {
+        enumName += `"${schemaName}".`;
+      }
+
+      enumName += `"${options.enumName}"`;
+
+      if (!options.existingType) {
+        this.tableCompiler.unshiftQuery(
+          `create type ${enumName} as enum ('${values}')`
+        );
+      }
+
+      return enumName;
+    }
+    return `text check (${this.formatter.wrap(this.args[0])} in ('${values}'))`;
+  },
+
+  double: 'double precision',
+  decimal(precision, scale) {
+    if (precision === null) return 'decimal';
+    return `decimal(${this._num(precision, 8)}, ${this._num(scale, 2)})`;
+  },
+  floating: 'real',
+  increments: 'serial primary key',
+  json(jsonb) {
+    if (jsonb) this.client.logger.deprecate('json(true)', 'jsonb()');
+    return jsonColumn(this.client, jsonb);
+  },
+  jsonb() {
+    return jsonColumn(this.client, true);
+  },
+  smallint: 'smallint',
+  tinyint: 'smallint',
+  datetime(withoutTz = false, precision) {
+    let useTz;
+    if (isObject(withoutTz)) {
+      ({ useTz, precision } = withoutTz);
+    } else {
+      useTz = !withoutTz;
+    }
+
+    return `${useTz ? 'timestamptz' : 'timestamp'}${
+      precision ? '(' + precision + ')' : ''
+    }`;
+  },
+  timestamp(withoutTz = false, precision) {
+    let useTz;
+    if (isObject(withoutTz)) {
+      ({ useTz, precision } = withoutTz);
+    } else {
+      useTz = !withoutTz;
+    }
+
+    return `${useTz ? 'timestamptz' : 'timestamp'}${
+      precision ? '(' + precision + ')' : ''
+    }`;
+  },
+  uuid: 'uuid',
+
+  // Modifiers:
+  // ------
+  comment(comment) {
+    const columnName = this.args[0] || this.defaults('columnName');
+
+    this.pushAdditional(function() {
+      this.pushQuery(
+        `comment on column ${this.tableCompiler.tableName()}.` +
+          this.formatter.wrap(columnName) +
+          ' is ' +
+          (comment ? `'${comment}'` : 'NULL')
+      );
+    }, comment);
+  },
+});
+
+function jsonColumn(client, jsonb) {
+  if (!client.version || parseFloat(client.version) >= 9.2)
+    return jsonb ? 'jsonb' : 'json';
+  return 'text';
+}
+
+module.exports = ColumnCompiler_PG;

node_modules/knex/lib/dialects/postgres/schema/compiler.js

@@ -0,0 +1,109 @@
+// PostgreSQL Schema Compiler
+// -------
+
+const inherits = require('inherits');
+const SchemaCompiler = require('../../../schema/compiler');
+
+function SchemaCompiler_PG() {
+  SchemaCompiler.apply(this, arguments);
+}
+inherits(SchemaCompiler_PG, SchemaCompiler);
+
+// Check whether the current table
+SchemaCompiler_PG.prototype.hasTable = function(tableName) {
+  let sql = 'select * from information_schema.tables where table_name = ?';
+  const bindings = [tableName];
+
+  if (this.schema) {
+    sql += ' and table_schema = ?';
+    bindings.push(this.schema);
+  } else {
+    sql += ' and table_schema = current_schema()';
+  }
+
+  this.pushQuery({
+    sql,
+    bindings,
+    output(resp) {
+      return resp.rows.length > 0;
+    },
+  });
+};
+
+// Compile the query to determine if a column exists in a table.
+SchemaCompiler_PG.prototype.hasColumn = function(tableName, columnName) {
+  let sql =
+    'select * from information_schema.columns where table_name = ? and column_name = ?';
+  const bindings = [tableName, columnName];
+
+  if (this.schema) {
+    sql += ' and table_schema = ?';
+    bindings.push(this.schema);
+  } else {
+    sql += ' and table_schema = current_schema()';
+  }
+
+  this.pushQuery({
+    sql,
+    bindings,
+    output(resp) {
+      return resp.rows.length > 0;
+    },
+  });
+};
+
+SchemaCompiler_PG.prototype.qualifiedTableName = function(tableName) {
+  const name = this.schema ? `${this.schema}.${tableName}` : tableName;
+  return this.formatter.wrap(name);
+};
+
+// Compile a rename table command.
+SchemaCompiler_PG.prototype.renameTable = function(from, to) {
+  this.pushQuery(
+    `alter table ${this.qualifiedTableName(
+      from
+    )} rename to ${this.formatter.wrap(to)}`
+  );
+};
+
+SchemaCompiler_PG.prototype.createSchema = function(schemaName) {
+  this.pushQuery(`create schema ${this.formatter.wrap(schemaName)}`);
+};
+
+SchemaCompiler_PG.prototype.createSchemaIfNotExists = function(schemaName) {
+  this.pushQuery(
+    `create schema if not exists ${this.formatter.wrap(schemaName)}`
+  );
+};
+
+SchemaCompiler_PG.prototype.dropSchema = function(schemaName) {
+  this.pushQuery(`drop schema ${this.formatter.wrap(schemaName)}`);
+};
+
+SchemaCompiler_PG.prototype.dropSchemaIfExists = function(schemaName) {
+  this.pushQuery(`drop schema if exists ${this.formatter.wrap(schemaName)}`);
+};
+
+SchemaCompiler_PG.prototype.dropExtension = function(extensionName) {
+  this.pushQuery(`drop extension ${this.formatter.wrap(extensionName)}`);
+};
+
+SchemaCompiler_PG.prototype.dropExtensionIfExists = function(extensionName) {
+  this.pushQuery(
+    `drop extension if exists ${this.formatter.wrap(extensionName)}`
+  );
+};
+
+SchemaCompiler_PG.prototype.createExtension = function(extensionName) {
+  this.pushQuery(`create extension ${this.formatter.wrap(extensionName)}`);
+};
+
+SchemaCompiler_PG.prototype.createExtensionIfNotExists = function(
+  extensionName
+) {
+  this.pushQuery(
+    `create extension if not exists ${this.formatter.wrap(extensionName)}`
+  );
+};
+
+module.exports = SchemaCompiler_PG;

node_modules/knex/lib/dialects/postgres/schema/tablecompiler.js

@@ -0,0 +1,183 @@
+/* eslint max-len: 0 */
+
+// PostgreSQL Table Builder & Compiler
+// -------
+
+const inherits = require('inherits');
+const TableCompiler = require('../../../schema/tablecompiler');
+
+const { has } = require('lodash');
+
+function TableCompiler_PG() {
+  TableCompiler.apply(this, arguments);
+}
+inherits(TableCompiler_PG, TableCompiler);
+
+// Compile a rename column command.
+TableCompiler_PG.prototype.renameColumn = function(from, to) {
+  return this.pushQuery({
+    sql: `alter table ${this.tableName()} rename ${this.formatter.wrap(
+      from
+    )} to ${this.formatter.wrap(to)}`,
+  });
+};
+
+TableCompiler_PG.prototype.compileAdd = function(builder) {
+  const table = this.formatter.wrap(builder);
+  const columns = this.prefixArray('add column', this.getColumns(builder));
+  return this.pushQuery({
+    sql: `alter table ${table} ${columns.join(', ')}`,
+  });
+};
+
+// Adds the "create" query to the query sequence.
+TableCompiler_PG.prototype.createQuery = function(columns, ifNot) {
+  const createStatement = ifNot
+    ? 'create table if not exists '
+    : 'create table ';
+  let sql =
+    createStatement + this.tableName() + ' (' + columns.sql.join(', ') + ')';
+  if (this.single.inherits)
+    sql += ` inherits (${this.formatter.wrap(this.single.inherits)})`;
+  this.pushQuery({
+    sql,
+    bindings: columns.bindings,
+  });
+  const hasComment = has(this.single, 'comment');
+  if (hasComment) this.comment(this.single.comment);
+};
+
+TableCompiler_PG.prototype.addColumns = function(
+  columns,
+  prefix,
+  colCompilers
+) {
+  if (prefix === this.alterColumnsPrefix) {
+    // alter columns
+    for (const col of colCompilers) {
+      const quotedTableName = this.tableName();
+      const type = col.getColumnType();
+      // We'd prefer to call this.formatter.wrapAsIdentifier here instead, however the context passed to
+      // `this` instance is not that of the column, but of the table. Thus, we unfortunately have to call
+      // `wrapIdentifier` here as well (it is already called once on the initial column operation) to give
+      // our `alter` operation the correct `queryContext`. Refer to issue #2606 and PR #2612.
+      const colName = this.client.wrapIdentifier(
+        col.getColumnName(),
+        col.columnBuilder.queryContext()
+      );
+
+      this.pushQuery({
+        sql: `alter table ${quotedTableName} alter column ${colName} drop default`,
+        bindings: [],
+      });
+      this.pushQuery({
+        sql: `alter table ${quotedTableName} alter column ${colName} drop not null`,
+        bindings: [],
+      });
+      this.pushQuery({
+        sql: `alter table ${quotedTableName} alter column ${colName} type ${type} using (${colName}::${type})`,
+        bindings: [],
+      });
+
+      const defaultTo = col.modified['defaultTo'];
+      if (defaultTo) {
+        const modifier = col.defaultTo.apply(col, defaultTo);
+        this.pushQuery({
+          sql: `alter table ${quotedTableName} alter column ${colName} set ${modifier}`,
+          bindings: [],
+        });
+      }
+
+      const nullable = col.modified['nullable'];
+      if (nullable && nullable[0] === false) {
+        this.pushQuery({
+          sql: `alter table ${quotedTableName} alter column ${colName} set not null`,
+          bindings: [],
+        });
+      }
+    }
+  } else {
+    // base class implementation for normal add
+    TableCompiler.prototype.addColumns.call(this, columns, prefix);
+  }
+};
+
+// Compiles the comment on the table.
+TableCompiler_PG.prototype.comment = function(comment) {
+  this.pushQuery(
+    `comment on table ${this.tableName()} is '${this.single.comment}'`
+  );
+};
+
+// Indexes:
+// -------
+
+TableCompiler_PG.prototype.primary = function(columns, constraintName) {
+  constraintName = constraintName
+    ? this.formatter.wrap(constraintName)
+    : this.formatter.wrap(`${this.tableNameRaw}_pkey`);
+  this.pushQuery(
+    `alter table ${this.tableName()} add constraint ${constraintName} primary key (${this.formatter.columnize(
+      columns
+    )})`
+  );
+};
+TableCompiler_PG.prototype.unique = function(columns, indexName) {
+  indexName = indexName
+    ? this.formatter.wrap(indexName)
+    : this._indexCommand('unique', this.tableNameRaw, columns);
+  this.pushQuery(
+    `alter table ${this.tableName()} add constraint ${indexName}` +
+      ' unique (' +
+      this.formatter.columnize(columns) +
+      ')'
+  );
+};
+TableCompiler_PG.prototype.index = function(columns, indexName, indexType) {
+  indexName = indexName
+    ? this.formatter.wrap(indexName)
+    : this._indexCommand('index', this.tableNameRaw, columns);
+  this.pushQuery(
+    `create index ${indexName} on ${this.tableName()}${(indexType &&
+      ` using ${indexType}`) ||
+      ''}` +
+      ' (' +
+      this.formatter.columnize(columns) +
+      ')'
+  );
+};
+TableCompiler_PG.prototype.dropPrimary = function(constraintName) {
+  constraintName = constraintName
+    ? this.formatter.wrap(constraintName)
+    : this.formatter.wrap(this.tableNameRaw + '_pkey');
+  this.pushQuery(
+    `alter table ${this.tableName()} drop constraint ${constraintName}`
+  );
+};
+TableCompiler_PG.prototype.dropIndex = function(columns, indexName) {
+  indexName = indexName
+    ? this.formatter.wrap(indexName)
+    : this._indexCommand('index', this.tableNameRaw, columns);
+  indexName = this.schemaNameRaw
+    ? `${this.formatter.wrap(this.schemaNameRaw)}.${indexName}`
+    : indexName;
+  this.pushQuery(`drop index ${indexName}`);
+};
+TableCompiler_PG.prototype.dropUnique = function(columns, indexName) {
+  indexName = indexName
+    ? this.formatter.wrap(indexName)
+    : this._indexCommand('unique', this.tableNameRaw, columns);
+  this.pushQuery(
+    `alter table ${this.tableName()} drop constraint ${indexName}`
+  );
+};
+TableCompiler_PG.prototype.dropForeign = function(columns, indexName) {
+  indexName = indexName
+    ? this.formatter.wrap(indexName)
+    : this._indexCommand('foreign', this.tableNameRaw, columns);
+  this.pushQuery(
+    `alter table ${this.tableName()} drop constraint ${indexName}`
+  );
+};
+
+module.exports = TableCompiler_PG;