/* Copyright (c) 2017, 2021, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#include "sql/dd/impl/system_views/tables.h"

#include <string>

#include "sql/stateless_allocator.h"

namespace dd {
namespace system_views {

const Tables_base &Tables::instance() {
  static Tables_base *s_instance = new Tables();
  return *s_instance;
}

Tables_base::Tables_base() {
  m_target_def.add_field(FIELD_TABLE_CATALOG, "TABLE_CATALOG",
                         "cat.name" + m_target_def.fs_name_collation());
  m_target_def.add_field(FIELD_TABLE_SCHEMA, "TABLE_SCHEMA",
                         "sch.name" + m_target_def.fs_name_collation());
  m_target_def.add_field(FIELD_TABLE_NAME, "TABLE_NAME",
                         "tbl.name" + m_target_def.fs_name_collation());
  m_target_def.add_field(FIELD_TABLE_TYPE, "TABLE_TYPE", "tbl.type");
  m_target_def.add_field(FIELD_ENGINE, "ENGINE",
                         "IF(tbl.type = 'BASE TABLE', tbl.engine, NULL)");
  m_target_def.add_field(
      FIELD_VERSION, "VERSION",
      "IF(tbl.type = 'VIEW', NULL, 10 /* FRM_VER_TRUE_VARCHAR */)");
  m_target_def.add_field(FIELD_ROW_FORMAT, "ROW_FORMAT", "tbl.row_format");

  m_target_def.add_field(FIELD_CREATE_TIME, "CREATE_TIME", "tbl.created");
  m_target_def.add_field(FIELD_TABLE_COLLATION, "TABLE_COLLATION", "col.name");
  m_target_def.add_field(
      FIELD_CREATE_OPTIONS, "CREATE_OPTIONS",
      "IF (tbl.type = 'VIEW', NULL,"
      "  GET_DD_CREATE_OPTIONS(tbl.options,"
      "  IF(IFNULL(tbl.partition_expression, 'NOT_PART_TBL')='NOT_PART_TBL',"
      "     0, 1), IF(sch.default_encryption='YES',1,0)))");
  m_target_def.add_field(
      FIELD_TABLE_COMMENT, "TABLE_COMMENT",
      "INTERNAL_GET_COMMENT_OR_ERROR(sch.name, tbl.name, tbl.type, "
      "tbl.options, tbl.comment)");

  m_target_def.add_from("mysql.tables tbl");
  m_target_def.add_from("JOIN mysql.schemata sch ON tbl.schema_id=sch.id");
  m_target_def.add_from(
      "JOIN mysql.catalogs cat ON "
      "cat.id=sch.catalog_id");
  m_target_def.add_from(
      "LEFT JOIN mysql.collations col ON "
      "tbl.collation_id=col.id");

  m_target_def.add_where("CAN_ACCESS_TABLE(sch.name, tbl.name)");
  m_target_def.add_where("AND IS_VISIBLE_DD_OBJECT(tbl.hidden)");
}

/*
  Adding column definition so as to pick cached table statistics from
  mysql.table_stats.
*/
Tables::Tables() {
  m_target_def.set_view_name(view_name());

  /*
    stat.<value> and stat.cached_time should be passed directly to UDFs
    and UDF implementation should handle NULL value. Using IFNULL() as a
    workaround until Bug#26389402 is fixed.
  */
  m_target_def.add_field(FIELD_TABLE_ROWS, "TABLE_ROWS",
                         "IF (tbl.type = 'VIEW', NULL,"
                         "INTERNAL_TABLE_ROWS(sch.name, tbl.name,"
                         "  IF(ISNULL(tbl.partition_type), tbl.engine, ''),"
                         "  tbl.se_private_id, tbl.hidden != 'Visible', "
                         "  ts.se_private_data,"
                         "  COALESCE(stat.table_rows, 0),"
                         "  COALESCE(CAST(stat.cached_time as UNSIGNED), 0)))");
  m_target_def.add_field(FIELD_AVG_ROW_LENGTH, "AVG_ROW_LENGTH",
                         "IF (tbl.type = 'VIEW', NULL,"
                         "INTERNAL_AVG_ROW_LENGTH(sch.name, tbl.name,"
                         "  IF(ISNULL(tbl.partition_type), tbl.engine, ''),"
                         "  tbl.se_private_id, tbl.hidden != 'Visible', "
                         "  ts.se_private_data,"
                         "  COALESCE(stat.avg_row_length, 0),"
                         "  COALESCE(CAST(stat.cached_time as UNSIGNED), 0)))");
  m_target_def.add_field(FIELD_DATA_LENGTH, "DATA_LENGTH",
                         "IF (tbl.type = 'VIEW', NULL,"
                         "INTERNAL_DATA_LENGTH(sch.name, tbl.name,"
                         "  IF(ISNULL(tbl.partition_type), tbl.engine, ''),"
                         "  tbl.se_private_id, tbl.hidden != 'Visible', "
                         "  ts.se_private_data,"
                         "  COALESCE(stat.data_length, 0),"
                         "  COALESCE(CAST(stat.cached_time as UNSIGNED), 0)))");
  m_target_def.add_field(FIELD_MAX_DATA_LENGTH, "MAX_DATA_LENGTH",
                         "IF (tbl.type = 'VIEW', NULL,"
                         "INTERNAL_MAX_DATA_LENGTH(sch.name, tbl.name,"
                         "  IF(ISNULL(tbl.partition_type), tbl.engine, ''),"
                         "  tbl.se_private_id, tbl.hidden != 'Visible', "
                         "  ts.se_private_data,"
                         "  COALESCE(stat.max_data_length, 0),"
                         "  COALESCE(CAST(stat.cached_time as UNSIGNED), 0)))");
  m_target_def.add_field(FIELD_INDEX_LENGTH, "INDEX_LENGTH",
                         "IF (tbl.type = 'VIEW', NULL,"
                         "INTERNAL_INDEX_LENGTH(sch.name, tbl.name,"
                         "  IF(ISNULL(tbl.partition_type), tbl.engine, ''),"
                         "  tbl.se_private_id, tbl.hidden != 'Visible', "
                         "  ts.se_private_data,"
                         "  COALESCE(stat.index_length, 0),"
                         "  COALESCE(CAST(stat.cached_time as UNSIGNED), 0)))");
  m_target_def.add_field(FIELD_DATA_FREE, "DATA_FREE",
                         "IF (tbl.type = 'VIEW', NULL,"
                         "INTERNAL_DATA_FREE(sch.name, tbl.name,"
                         "  IF(ISNULL(tbl.partition_type), tbl.engine, ''),"
                         "  tbl.se_private_id, tbl.hidden != 'Visible', "
                         "  ts.se_private_data,"
                         "  COALESCE(stat.data_free, 0),"
                         "  COALESCE(CAST(stat.cached_time as UNSIGNED), 0)))");
  m_target_def.add_field(FIELD_AUTO_INCREMENT, "AUTO_INCREMENT",
                         "IF (tbl.type = 'VIEW', NULL,"
                         "INTERNAL_AUTO_INCREMENT(sch.name, tbl.name,"
                         "  IF(ISNULL(tbl.partition_type), tbl.engine, ''),"
                         "  tbl.se_private_id, tbl.hidden != 'Visible', "
                         "  ts.se_private_data,"
                         "  COALESCE(stat.auto_increment, 0),"
                         "  COALESCE(CAST(stat.cached_time as UNSIGNED), 0), "
                         "tbl.se_private_data))");
  m_target_def.add_field(FIELD_UPDATE_TIME, "UPDATE_TIME",
                         "IF (tbl.type = 'VIEW', NULL,"
                         "INTERNAL_UPDATE_TIME(sch.name, tbl.name,"
                         "  IF(ISNULL(tbl.partition_type), tbl.engine, ''),"
                         "  tbl.se_private_id, tbl.hidden != 'Visible', "
                         "  ts.se_private_data,"
                         "  COALESCE(CAST(stat.update_time as UNSIGNED), 0),"
                         "  COALESCE(CAST(stat.cached_time as UNSIGNED), 0)))");
  m_target_def.add_field(FIELD_CHECK_TIME, "CHECK_TIME",
                         "IF (tbl.type = 'VIEW', NULL,"
                         "INTERNAL_CHECK_TIME(sch.name, tbl.name,"
                         "  IF(ISNULL(tbl.partition_type), tbl.engine, ''),"
                         "  tbl.se_private_id, tbl.hidden != 'Visible', "
                         "  ts.se_private_data,"
                         "  COALESCE(CAST(stat.check_time as UNSIGNED), 0),"
                         "  COALESCE(CAST(stat.cached_time as UNSIGNED), 0)))");
  m_target_def.add_field(FIELD_CHECKSUM, "CHECKSUM",
                         "IF (tbl.type = 'VIEW', NULL,"
                         "INTERNAL_CHECKSUM(sch.name, tbl.name,"
                         "  IF(ISNULL(tbl.partition_type), tbl.engine, ''),"
                         "  tbl.se_private_id, tbl.hidden != 'Visible', "
                         "  ts.se_private_data,"
                         "  COALESCE(stat.checksum, 0),"
                         "  COALESCE(CAST(stat.cached_time as UNSIGNED), 0)))");
  /*
    Supply mysql.tablespaces.se_private_data to internal functions
    INTERNAL_*(), which is used by SE to read the SE specific tablespace
    metadata when fetching table dynamic statistics. E.g., InnoDB would
    read the SE specific space_id from se_private_data column.
  */
  m_target_def.add_from(
      "LEFT JOIN mysql.tablespaces ts ON "
      "tbl.tablespace_id=ts.id");

  m_target_def.add_from(
      "LEFT JOIN mysql.table_stats stat ON "
      "tbl.name=stat.table_name "
      "AND sch.name=stat.schema_name");
}

}  // namespace system_views
}  // namespace dd
