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Platform-independent, interactive-speed data analytics system
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/*
 *    Copyright 2018 University of Michigan
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package org.verdictdb.sqlsyntax;

public class PostgresqlSyntax extends SqlSyntax {

  public static final String CHILD_PARTITION_TABLE_SUFFIX = "_vpart%05d";

  @Override
  public int getSchemaNameColumnIndex() {
    return 0;
  }

  @Override
  public int getTableNameColumnIndex() {
    return 0;
  }

  @Override
  public int getColumnNameColumnIndex() {
    return 0;
  }

  @Override
  public String getFallbackDefaultSchema() {
    return "public";
  }

  @Override
  public int getColumnTypeColumnIndex() {
    return 1;
  }

  public int getCharacterMaximumLengthColumnIndex() {
    return 2;
  }

  @Override
  public String getQuoteString() {
    return "\"";
  }

  @Override
  public void dropTable(String schema, String tablename) {}

  @Override
  public boolean doesSupportTablePartitioning() {
    return true;
  }

  @Override
  public String randFunction() {
    return "random()";
  }

  @Override
  public String getSchemaCommand() {
    return "select schema_name from information_schema.schemata";
  }

  @Override
  public String getTableCommand(String schema) {
    return "SELECT table_name FROM information_schema.tables "
        + "WHERE table_schema = '"
        + schema
        + "'";
  }

  @Override
  public String getColumnsCommand(String schema, String table) {
    return "select column_name, data_type, character_maximum_length "
        + "from INFORMATION_SCHEMA.COLUMNS where table_name = '"
        + table
        + "' and table_schema = '"
        + schema
        + "'";
  }

  @Override
  public String getPartitionCommand(String schema, String table) {
    return "select partattrs from pg_partitioned_table join pg_class on pg_class.relname='"
        + table
        + "' "
        + "and pg_class.oid = pg_partitioned_table.partrelid join information_schema.tables "
        + "on table_schema='"
        + schema
        + "' and table_name = '"
        + table
        + "'";
  }

  @Override
  public String getPartitionByInCreateTable() {
    return "partition by list";
  }

  @Override
  public boolean isAsRequiredBeforeSelectInCreateTable() {
    return true;
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == null) {
      return false;
    }
    if (obj == this) {
      return true;
    }
    if (obj.getClass() != getClass()) {
      return false;
    }
    return true;
  }
}