/* Copyright (c) 2008, 2022, 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 "storage/perfschema/ha_perfschema.h"

#include <string.h>
/**
  @file storage/perfschema/ha_perfschema.cc
  Performance schema storage engine (implementation).
*/
#include <atomic>

#include "lex_string.h"
#include "lf.h"
#include "m_string.h"
#include "my_alloc.h"
#include "my_compiler.h"
#include "my_dbug.h"
#include "my_sys.h"
#include "mysql/components/services/pfs_plugin_table_service.h"
#include "mysql/plugin.h"
#include "mysql/status_var.h"
#include "mysqld_error.h"
#include "sql/hostname_cache.h"
#include "sql/mysqld.h"
#include "sql/sql_class.h"
#include "sql/system_variables.h"
#include "sql/table.h"
#include "storage/perfschema/pfs_account.h"
#include "storage/perfschema/pfs_buffer_container.h"
#include "storage/perfschema/pfs_builtin_memory.h"
#include "storage/perfschema/pfs_column_values.h"
#include "storage/perfschema/pfs_dd_version.h"
#include "storage/perfschema/pfs_digest.h"
#include "storage/perfschema/pfs_engine_table.h"
#include "storage/perfschema/pfs_events_stages.h"
#include "storage/perfschema/pfs_events_statements.h"
#include "storage/perfschema/pfs_events_transactions.h"
#include "storage/perfschema/pfs_events_waits.h"
#include "storage/perfschema/pfs_global.h"
#include "storage/perfschema/pfs_host.h"
#include "storage/perfschema/pfs_instr.h"
#include "storage/perfschema/pfs_instr_class.h"
#include "storage/perfschema/pfs_program.h"
#include "storage/perfschema/pfs_setup_actor.h"
#include "storage/perfschema/pfs_setup_object.h"
#include "storage/perfschema/pfs_stat.h"
#include "storage/perfschema/pfs_user.h"

/*
  Make sure the PFS_DD_VERSION is sane.
  Normally,
    PFS_DD_VERSION <= MYSQL_VERSION_ID

  Exceptionally,
  because a given version number might have already leaked anyway:
  - MySQL 8.0.16 claims to have PFS_DD_VERSION = 80017 tables instead of 80016
  - known backports, rogue forks, lab releases, etc, could claim a version
  number ... versions can be named in a second space, [MYSQL_VERSION_ID * 10,
  MYSQL_VERSION_ID * 10 + 9]

  For example, because MySQL 8.0.17 can not claim PFS_DD_VERSION = 80017,
  it then claims PFS_DD_VERSION = 800171.

  By the next release, MySQL 8.0.18 should claim PFS_DD_VERSION = 80018,
  to resume a sane numbering (even without schema changes).

  Document every exception in the assert below,
  so that by the time MYSQL_VERSION_ID is renumbered,
  the build fails (forcing adjustment on PFS_DD_VERSION to be sane again).
*/

static_assert((PFS_DD_VERSION <= MYSQL_VERSION_ID) ||
                  ((PFS_DD_VERSION == 800172) && (MYSQL_VERSION_ID == 80017)),
              "This release can not use a version number from the future");

class KEY;
class Plugin_table;
class Plugin_tablespace;
namespace dd {
class Table;
}  // namespace dd
template <class T>
class List;

handlerton *pfs_hton = nullptr;

#define PFS_ENABLED() \
  (pfs_initialized && (pfs_enabled || m_table_share->m_perpetual))

#define IS_NATIVE_TABLE(X) ((X)->m_st_table.open_table == NULL) ? true : false

static void lock_pfs_external_table_shares() {
  if (!opt_initialize) {
    pfs_external_table_shares.lock_share_list();
  }
}

static void unlock_pfs_external_table_shares() {
  if (!opt_initialize) {
    pfs_external_table_shares.unlock_share_list();
  }
}

static handler *pfs_create_handler(handlerton *hton, TABLE_SHARE *table, bool,
                                   MEM_ROOT *mem_root) {
  return new (mem_root) ha_perfschema(hton, table);
}

static size_t size_of_global_error_stat_buffer() {
  size_t size = sizeof(PFS_error_single_stat) * max_global_server_errors;
  return size;
}

static size_t size_of_session_error_stat_buffer() {
  size_t size;
  if (max_session_server_errors != 0) {
    size = sizeof(PFS_error_stat) +
           sizeof(PFS_error_single_stat) * max_session_server_errors;
  } else {
    size = 0;
  }
  return size;
}

/**
  SHOW ENGINE PERFORMANCE_SCHEMA STATUS.
  @param thd                Current thread
  @param print              Print function
  @param stat               status to show
*/
static bool pfs_show_status(handlerton *, THD *thd, stat_print_fn *print,
                            enum ha_stat_type stat) {
  char buf[1024];
  uint buflen;
  const char *name;
  int i;
  size_t size;

  DBUG_TRACE;

  /*
    Note about naming conventions:
    - Internal buffers exposed as a table in the performance schema are named
    after the table, as in 'events_waits_current'
    - Internal buffers not exposed by a table are named with parenthesis,
    as in '(pfs_mutex_class)'.
  */
  if (stat != HA_ENGINE_STATUS) {
    return false;
  }

  size_t total_memory = 0;

  for (i = 0; /* empty */; i++) {
    switch (i) {
      case 0:
        name = "events_waits_current.size";
        size = sizeof(PFS_events_waits);
        break;
      case 1:
        name = "events_waits_current.count";
        size = WAIT_STACK_SIZE * global_thread_container.get_row_count();
        break;
      case 2:
        name = "events_waits_history.size";
        size = sizeof(PFS_events_waits);
        break;
      case 3:
        name = "events_waits_history.count";
        size = events_waits_history_per_thread *
               global_thread_container.get_row_count();
        break;
      case 4:
        name = "events_waits_history.memory";
        size = events_waits_history_per_thread *
               global_thread_container.get_row_count() *
               sizeof(PFS_events_waits);
        total_memory += size;
        break;
      case 5:
        name = "events_waits_history_long.size";
        size = sizeof(PFS_events_waits);
        break;
      case 6:
        name = "events_waits_history_long.count";
        size = events_waits_history_long_size;
        break;
      case 7:
        name = "events_waits_history_long.memory";
        size = events_waits_history_long_size * sizeof(PFS_events_waits);
        total_memory += size;
        break;
      case 8:
        name = "(pfs_mutex_class).size";
        size = sizeof(PFS_mutex_class);
        break;
      case 9:
        name = "(pfs_mutex_class).count";
        size = mutex_class_max;
        break;
      case 10:
        name = "(pfs_mutex_class).memory";
        size = mutex_class_max * sizeof(PFS_mutex_class);
        total_memory += size;
        break;
      case 11:
        name = "(pfs_rwlock_class).size";
        size = sizeof(PFS_rwlock_class);
        break;
      case 12:
        name = "(pfs_rwlock_class).count";
        size = rwlock_class_max;
        break;
      case 13:
        name = "(pfs_rwlock_class).memory";
        size = rwlock_class_max * sizeof(PFS_rwlock_class);
        total_memory += size;
        break;
      case 14:
        name = "(pfs_cond_class).size";
        size = sizeof(PFS_cond_class);
        break;
      case 15:
        name = "(pfs_cond_class).count";
        size = cond_class_max;
        break;
      case 16:
        name = "(pfs_cond_class).memory";
        size = cond_class_max * sizeof(PFS_cond_class);
        total_memory += size;
        break;
      case 17:
        name = "(pfs_thread_class).size";
        size = sizeof(PFS_thread_class);
        break;
      case 18:
        name = "(pfs_thread_class).count";
        size = thread_class_max;
        break;
      case 19:
        name = "(pfs_thread_class).memory";
        size = thread_class_max * sizeof(PFS_thread_class);
        total_memory += size;
        break;
      case 20:
        name = "(pfs_file_class).size";
        size = sizeof(PFS_file_class);
        break;
      case 21:
        name = "(pfs_file_class).count";
        size = file_class_max;
        break;
      case 22:
        name = "(pfs_file_class).memory";
        size = file_class_max * sizeof(PFS_file_class);
        total_memory += size;
        break;
      case 23:
        name = "mutex_instances.size";
        size = global_mutex_container.get_row_size();
        break;
      case 24:
        name = "mutex_instances.count";
        size = global_mutex_container.get_row_count();
        break;
      case 25:
        name = "mutex_instances.memory";
        size = global_mutex_container.get_memory();
        total_memory += size;
        break;
      case 26:
        name = "rwlock_instances.size";
        size = global_rwlock_container.get_row_size();
        break;
      case 27:
        name = "rwlock_instances.count";
        size = global_rwlock_container.get_row_count();
        break;
      case 28:
        name = "rwlock_instances.memory";
        size = global_rwlock_container.get_memory();
        total_memory += size;
        break;
      case 29:
        name = "cond_instances.size";
        size = global_cond_container.get_row_size();
        break;
      case 30:
        name = "cond_instances.count";
        size = global_cond_container.get_row_count();
        break;
      case 31:
        name = "cond_instances.memory";
        size = global_cond_container.get_memory();
        total_memory += size;
        break;
      case 32:
        name = "threads.size";
        size = global_thread_container.get_row_size();
        break;
      case 33:
        name = "threads.count";
        size = global_thread_container.get_row_count();
        break;
      case 34:
        name = "threads.memory";
        size = global_thread_container.get_memory();
        total_memory += size;
        break;
      case 35:
        name = "file_instances.size";
        size = global_file_container.get_row_size();
        break;
      case 36:
        name = "file_instances.count";
        size = global_file_container.get_row_count();
        break;
      case 37:
        name = "file_instances.memory";
        size = global_file_container.get_memory();
        total_memory += size;
        break;
      case 38:
        name = "(pfs_file_handle).size";
        size = sizeof(PFS_file *);
        break;
      case 39:
        name = "(pfs_file_handle).count";
        size = file_handle_max;
        break;
      case 40:
        name = "(pfs_file_handle).memory";
        size = file_handle_max * sizeof(PFS_file *);
        total_memory += size;
        break;
      case 41:
        name = "events_waits_summary_by_thread_by_event_name.size";
        size = sizeof(PFS_single_stat);
        break;
      case 42:
        name = "events_waits_summary_by_thread_by_event_name.count";
        size = global_thread_container.get_row_count() * wait_class_max;
        break;
      case 43:
        name = "events_waits_summary_by_thread_by_event_name.memory";
        size = global_thread_container.get_row_count() * wait_class_max *
               sizeof(PFS_single_stat);
        total_memory += size;
        break;
      case 44:
        name = "(pfs_table_share).size";
        size = global_table_share_container.get_row_size();
        break;
      case 45:
        name = "(pfs_table_share).count";
        size = global_table_share_container.get_row_count();
        break;
      case 46:
        name = "(pfs_table_share).memory";
        size = global_table_share_container.get_memory();
        total_memory += size;
        break;
      case 47:
        name = "(pfs_table).size";
        size = global_table_container.get_row_size();
        break;
      case 48:
        name = "(pfs_table).count";
        size = global_table_container.get_row_count();
        break;
      case 49:
        name = "(pfs_table).memory";
        size = global_table_container.get_memory();
        total_memory += size;
        break;
      case 50:
        name = "setup_actors.size";
        size = global_setup_actor_container.get_row_size();
        break;
      case 51:
        name = "setup_actors.count";
        size = global_setup_actor_container.get_row_count();
        break;
      case 52:
        name = "setup_actors.memory";
        size = global_setup_actor_container.get_memory();
        total_memory += size;
        break;
      case 53:
        name = "setup_objects.size";
        size = global_setup_object_container.get_row_size();
        break;
      case 54:
        name = "setup_objects.count";
        size = global_setup_object_container.get_row_count();
        break;
      case 55:
        name = "setup_objects.memory";
        size = global_setup_object_container.get_memory();
        total_memory += size;
        break;
      case 56:
        name = "(pfs_account).size";
        size = global_account_container.get_row_size();
        break;
      case 57:
        name = "(pfs_account).count";
        size = global_account_container.get_row_count();
        break;
      case 58:
        name = "(pfs_account).memory";
        size = global_account_container.get_memory();
        total_memory += size;
        break;
      case 59:
        name = "events_waits_summary_by_account_by_event_name.size";
        size = sizeof(PFS_single_stat);
        break;
      case 60:
        name = "events_waits_summary_by_account_by_event_name.count";
        size = global_account_container.get_row_count() * wait_class_max;
        break;
      case 61:
        name = "events_waits_summary_by_account_by_event_name.memory";
        size = global_account_container.get_row_count() * wait_class_max *
               sizeof(PFS_single_stat);
        total_memory += size;
        break;
      case 62:
        name = "events_waits_summary_by_user_by_event_name.size";
        size = sizeof(PFS_single_stat);
        break;
      case 63:
        name = "events_waits_summary_by_user_by_event_name.count";
        size = global_user_container.get_row_count() * wait_class_max;
        break;
      case 64:
        name = "events_waits_summary_by_user_by_event_name.memory";
        size = global_user_container.get_row_count() * wait_class_max *
               sizeof(PFS_single_stat);
        total_memory += size;
        break;
      case 65:
        name = "events_waits_summary_by_host_by_event_name.size";
        size = sizeof(PFS_single_stat);
        break;
      case 66:
        name = "events_waits_summary_by_host_by_event_name.count";
        size = global_host_container.get_row_count() * wait_class_max;
        break;
      case 67:
        name = "events_waits_summary_by_host_by_event_name.memory";
        size = global_host_container.get_row_count() * wait_class_max *
               sizeof(PFS_single_stat);
        total_memory += size;
        break;
      case 68:
        name = "(pfs_user).size";
        size = global_user_container.get_row_size();
        break;
      case 69:
        name = "(pfs_user).count";
        size = global_user_container.get_row_count();
        break;
      case 70:
        name = "(pfs_user).memory";
        size = global_user_container.get_memory();
        total_memory += size;
        break;
      case 71:
        name = "(pfs_host).size";
        size = global_host_container.get_row_size();
        break;
      case 72:
        name = "(pfs_host).count";
        size = global_host_container.get_row_count();
        break;
      case 73:
        name = "(pfs_host).memory";
        size = global_host_container.get_memory();
        total_memory += size;
        break;
      case 74:
        name = "(pfs_stage_class).size";
        size = sizeof(PFS_stage_class);
        break;
      case 75:
        name = "(pfs_stage_class).count";
        size = stage_class_max;
        break;
      case 76:
        name = "(pfs_stage_class).memory";
        size = stage_class_max * sizeof(PFS_stage_class);
        total_memory += size;
        break;
      case 77:
        name = "events_stages_history.size";
        size = sizeof(PFS_events_stages);
        break;
      case 78:
        name = "events_stages_history.count";
        size = events_stages_history_per_thread *
               global_thread_container.get_row_count();
        break;
      case 79:
        name = "events_stages_history.memory";
        size = events_stages_history_per_thread *
               global_thread_container.get_row_count() *
               sizeof(PFS_events_stages);
        total_memory += size;
        break;
      case 80:
        name = "events_stages_history_long.size";
        size = sizeof(PFS_events_stages);
        break;
      case 81:
        name = "events_stages_history_long.count";
        size = events_stages_history_long_size;
        break;
      case 82:
        name = "events_stages_history_long.memory";
        size = events_stages_history_long_size * sizeof(PFS_events_stages);
        total_memory += size;
        break;
      case 83:
        name = "events_stages_summary_by_thread_by_event_name.size";
        size = sizeof(PFS_stage_stat);
        break;
      case 84:
        name = "events_stages_summary_by_thread_by_event_name.count";
        size = global_thread_container.get_row_count() * stage_class_max;
        break;
      case 85:
        name = "events_stages_summary_by_thread_by_event_name.memory";
        size = global_thread_container.get_row_count() * stage_class_max *
               sizeof(PFS_stage_stat);
        total_memory += size;
        break;
      case 86:
        name = "events_stages_summary_global_by_event_name.size";
        size = sizeof(PFS_stage_stat);
        break;
      case 87:
        name = "events_stages_summary_global_by_event_name.count";
        size = stage_class_max;
        break;
      case 88:
        name = "events_stages_summary_global_by_event_name.memory";
        size = stage_class_max * sizeof(PFS_stage_stat);
        total_memory += size;
        break;
      case 89:
        name = "events_stages_summary_by_account_by_event_name.size";
        size = sizeof(PFS_stage_stat);
        break;
      case 90:
        name = "events_stages_summary_by_account_by_event_name.count";
        size = global_account_container.get_row_count() * stage_class_max;
        break;
      case 91:
        name = "events_stages_summary_by_account_by_event_name.memory";
        size = global_account_container.get_row_count() * stage_class_max *
               sizeof(PFS_stage_stat);
        total_memory += size;
        break;
      case 92:
        name = "events_stages_summary_by_user_by_event_name.size";
        size = sizeof(PFS_stage_stat);
        break;
      case 93:
        name = "events_stages_summary_by_user_by_event_name.count";
        size = global_user_container.get_row_count() * stage_class_max;
        break;
      case 94:
        name = "events_stages_summary_by_user_by_event_name.memory";
        size = global_user_container.get_row_count() * stage_class_max *
               sizeof(PFS_stage_stat);
        total_memory += size;
        break;
      case 95:
        name = "events_stages_summary_by_host_by_event_name.size";
        size = sizeof(PFS_stage_stat);
        break;
      case 96:
        name = "events_stages_summary_by_host_by_event_name.count";
        size = global_host_container.get_row_count() * stage_class_max;
        break;
      case 97:
        name = "events_stages_summary_by_host_by_event_name.memory";
        size = global_host_container.get_row_count() * stage_class_max *
               sizeof(PFS_stage_stat);
        total_memory += size;
        break;
      case 98:
        name = "(pfs_statement_class).size";
        size = sizeof(PFS_statement_class);
        break;
      case 99:
        name = "(pfs_statement_class).count";
        size = statement_class_max;
        break;
      case 100:
        name = "(pfs_statement_class).memory";
        size = statement_class_max * sizeof(PFS_statement_class);
        total_memory += size;
        break;
      case 101:
        name = "events_statements_history.size";
        size = sizeof(PFS_events_statements);
        break;
      case 102:
        name = "events_statements_history.count";
        size = events_statements_history_per_thread *
               global_thread_container.get_row_count();
        break;
      case 103:
        name = "events_statements_history.memory";
        size = events_statements_history_per_thread *
               global_thread_container.get_row_count() *
               sizeof(PFS_events_statements);
        total_memory += size;
        break;
      case 104:
        name = "events_statements_history_long.size";
        size = sizeof(PFS_events_statements);
        break;
      case 105:
        name = "events_statements_history_long.count";
        size = events_statements_history_long_size;
        break;
      case 106:
        name = "events_statements_history_long.memory";
        size = events_statements_history_long_size *
               (sizeof(PFS_events_statements));
        total_memory += size;
        break;
      case 107:
        name = "events_statements_summary_by_thread_by_event_name.size";
        size = sizeof(PFS_statement_stat);
        break;
      case 108:
        name = "events_statements_summary_by_thread_by_event_name.count";
        size = global_thread_container.get_row_count() * statement_class_max;
        break;
      case 109:
        name = "events_statements_summary_by_thread_by_event_name.memory";
        size = global_thread_container.get_row_count() * statement_class_max *
               sizeof(PFS_statement_stat);
        total_memory += size;
        break;
      case 110:
        name = "events_statements_summary_global_by_event_name.size";
        size = sizeof(PFS_statement_stat);
        break;
      case 111:
        name = "events_statements_summary_global_by_event_name.count";
        size = statement_class_max;
        break;
      case 112:
        name = "events_statements_summary_global_by_event_name.memory";
        size = statement_class_max * sizeof(PFS_statement_stat);
        total_memory += size;
        break;
      case 113:
        name = "events_statements_summary_by_account_by_event_name.size";
        size = sizeof(PFS_statement_stat);
        break;
      case 114:
        name = "events_statements_summary_by_account_by_event_name.count";
        size = global_account_container.get_row_count() * statement_class_max;
        break;
      case 115:
        name = "events_statements_summary_by_account_by_event_name.memory";
        size = global_account_container.get_row_count() * statement_class_max *
               sizeof(PFS_statement_stat);
        total_memory += size;
        break;
      case 116:
        name = "events_statements_summary_by_user_by_event_name.size";
        size = sizeof(PFS_statement_stat);
        break;
      case 117:
        name = "events_statements_summary_by_user_by_event_name.count";
        size = global_user_container.get_row_count() * statement_class_max;
        break;
      case 118:
        name = "events_statements_summary_by_user_by_event_name.memory";
        size = global_user_container.get_row_count() * statement_class_max *
               sizeof(PFS_statement_stat);
        total_memory += size;
        break;
      case 119:
        name = "events_statements_summary_by_host_by_event_name.size";
        size = sizeof(PFS_statement_stat);
        break;
      case 120:
        name = "events_statements_summary_by_host_by_event_name.count";
        size = global_host_container.get_row_count() * statement_class_max;
        break;
      case 121:
        name = "events_statements_summary_by_host_by_event_name.memory";
        size = global_host_container.get_row_count() * statement_class_max *
               sizeof(PFS_statement_stat);
        total_memory += size;
        break;
      case 122:
        name = "events_statements_current.size";
        size = sizeof(PFS_events_statements);
        break;
      case 123:
        name = "events_statements_current.count";
        size = global_thread_container.get_row_count() * statement_stack_max;
        break;
      case 124:
        name = "events_statements_current.memory";
        size = global_thread_container.get_row_count() * statement_stack_max *
               sizeof(PFS_events_statements);
        total_memory += size;
        break;
      case 125:
        name = "(pfs_socket_class).size";
        size = sizeof(PFS_socket_class);
        break;
      case 126:
        name = "(pfs_socket_class).count";
        size = socket_class_max;
        break;
      case 127:
        name = "(pfs_socket_class).memory";
        size = socket_class_max * sizeof(PFS_socket_class);
        total_memory += size;
        break;
      case 128:
        name = "socket_instances.size";
        size = global_socket_container.get_row_size();
        break;
      case 129:
        name = "socket_instances.count";
        size = global_socket_container.get_row_count();
        break;
      case 130:
        name = "socket_instances.memory";
        size = global_socket_container.get_memory();
        total_memory += size;
        break;
      case 131:
        name = "events_statements_summary_by_digest.size";
        size = sizeof(PFS_statements_digest_stat);
        break;
      case 132:
        name = "events_statements_summary_by_digest.count";
        size = digest_max;
        break;
      case 133:
        name = "events_statements_summary_by_digest.memory";
        size = digest_max * (sizeof(PFS_statements_digest_stat));
        total_memory += size;
        break;
      case 134:
        name = "events_statements_summary_by_program.size";
        size = global_program_container.get_row_size();
        break;
      case 135:
        name = "events_statements_summary_by_program.count";
        size = global_program_container.get_row_count();
        break;
      case 136:
        name = "events_statements_summary_by_program.memory";
        size = global_program_container.get_memory();
        total_memory += size;
        break;
      case 137:
        name = "session_connect_attrs.size";
        size = global_thread_container.get_row_count();
        break;
      case 138:
        name = "session_connect_attrs.count";
        size = session_connect_attrs_size_per_thread;
        break;
      case 139:
        name = "session_connect_attrs.memory";
        size = global_thread_container.get_row_count() *
               session_connect_attrs_size_per_thread;
        total_memory += size;
        break;
      case 140:
        name = "prepared_statements_instances.size";
        size = global_prepared_stmt_container.get_row_size();
        break;
      case 141:
        name = "prepared_statements_instances.count";
        size = global_prepared_stmt_container.get_row_count();
        break;
      case 142:
        name = "prepared_statements_instances.memory";
        size = global_prepared_stmt_container.get_memory();
        total_memory += size;
        break;

      case 143:
        name = "(account_hash).count";
        size = account_hash.count;
        break;
      case 144:
        name = "(account_hash).size";
        size = account_hash.size;
        break;
      case 145:
        name = "(digest_hash).count";
        size = digest_hash.count;
        break;
      case 146:
        name = "(digest_hash).size";
        size = digest_hash.size;
        break;
      case 147:
        name = "(filename_hash).count";
        size = filename_hash.count;
        break;
      case 148:
        name = "(filename_hash).size";
        size = filename_hash.size;
        break;
      case 149:
        name = "(host_hash).count";
        size = host_hash.count;
        break;
      case 150:
        name = "(host_hash).size";
        size = host_hash.size;
        break;
      case 151:
        name = "(setup_actor_hash).count";
        size = setup_actor_hash.count;
        break;
      case 152:
        name = "(setup_actor_hash).size";
        size = setup_actor_hash.size;
        break;
      case 153:
        name = "(setup_object_hash).count";
        size = setup_object_hash.count;
        break;
      case 154:
        name = "(setup_object_hash).size";
        size = setup_object_hash.size;
        break;
      case 155:
        name = "(table_share_hash).count";
        size = table_share_hash.count;
        break;
      case 156:
        name = "(table_share_hash).size";
        size = table_share_hash.size;
        break;
      case 157:
        name = "(user_hash).count";
        size = user_hash.count;
        break;
      case 158:
        name = "(user_hash).size";
        size = user_hash.size;
        break;
      case 159:
        name = "(program_hash).count";
        size = program_hash.count;
        break;
      case 160:
        name = "(program_hash).size";
        size = program_hash.size;
        break;
      case 161:
        /*
          This is not a performance_schema buffer,
          the data is maintained in the server,
          in hostname_cache.
          Print the size only, there are:
          - no host_cache.count
          - no host_cache.memory
        */
        name = "host_cache.size";
        size = sizeof(Host_entry);
        break;

      case 162:
        name = "(pfs_memory_class).row_size";
        size = sizeof(PFS_memory_class);
        break;
      case 163:
        name = "(pfs_memory_class).row_count";
        size = memory_class_max;
        break;
      case 164:
        name = "(pfs_memory_class).memory";
        size = memory_class_max * sizeof(PFS_memory_class);
        total_memory += size;
        break;

      case 165:
        name = "memory_summary_by_thread_by_event_name.row_size";
        size = sizeof(PFS_memory_safe_stat);
        break;
      case 166:
        name = "memory_summary_by_thread_by_event_name.row_count";
        size = global_thread_container.get_row_count() * memory_class_max;
        break;
      case 167:
        name = "memory_summary_by_thread_by_event_name.memory";
        size = global_thread_container.get_row_count() * memory_class_max *
               sizeof(PFS_memory_safe_stat);
        total_memory += size;
        break;
      case 168:
        name = "memory_summary_global_by_event_name.row_size";
        size = sizeof(PFS_memory_shared_stat);
        break;
      case 169:
        name = "memory_summary_global_by_event_name.row_count";
        size = memory_class_max;
        break;
      case 170:
        name = "memory_summary_global_by_event_name.memory";
        size = memory_class_max * sizeof(PFS_memory_shared_stat);
        total_memory += size;
        break;
      case 171:
        name = "memory_summary_by_account_by_event_name.row_size";
        size = sizeof(PFS_memory_shared_stat);
        break;
      case 172:
        name = "memory_summary_by_account_by_event_name.row_count";
        size = global_account_container.get_row_count() * memory_class_max;
        break;
      case 173:
        name = "memory_summary_by_account_by_event_name.memory";
        size = global_account_container.get_row_count() * memory_class_max *
               sizeof(PFS_memory_shared_stat);
        total_memory += size;
        break;
      case 174:
        name = "memory_summary_by_user_by_event_name.row_size";
        size = sizeof(PFS_memory_shared_stat);
        break;
      case 175:
        name = "memory_summary_by_user_by_event_name.row_count";
        size = global_user_container.get_row_count() * memory_class_max;
        break;
      case 176:
        name = "memory_summary_by_user_by_event_name.memory";
        size = global_user_container.get_row_count() * memory_class_max *
               sizeof(PFS_memory_shared_stat);
        total_memory += size;
        break;
      case 177:
        name = "memory_summary_by_host_by_event_name.row_size";
        size = sizeof(PFS_memory_shared_stat);
        break;
      case 178:
        name = "memory_summary_by_host_by_event_name.row_count";
        size = global_host_container.get_row_count() * memory_class_max;
        break;
      case 179:
        name = "memory_summary_by_host_by_event_name.memory";
        size = global_host_container.get_row_count() * memory_class_max *
               sizeof(PFS_memory_shared_stat);
        total_memory += size;
        break;
      case 180:
        name = "metadata_locks.row_size";
        size = global_mdl_container.get_row_size();
        break;
      case 181:
        name = "metadata_locks.row_count";
        size = global_mdl_container.get_row_count();
        break;
      case 182:
        name = "metadata_locks.memory";
        size = global_mdl_container.get_memory();
        total_memory += size;
        break;
      case 183:
        name = "events_transactions_history.size";
        size = sizeof(PFS_events_transactions);
        break;
      case 184:
        name = "events_transactions_history.count";
        size = events_transactions_history_per_thread *
               global_thread_container.get_row_count();
        break;
      case 185:
        name = "events_transactions_history.memory";
        size = events_transactions_history_per_thread *
               global_thread_container.get_row_count() *
               sizeof(PFS_events_transactions);
        total_memory += size;
        break;
      case 186:
        name = "events_transactions_history_long.size";
        size = sizeof(PFS_events_transactions);
        break;
      case 187:
        name = "events_transactions_history_long.count";
        size = events_transactions_history_long_size;
        break;
      case 188:
        name = "events_transactions_history_long.memory";
        size = events_transactions_history_long_size *
               sizeof(PFS_events_transactions);
        total_memory += size;
        break;
      case 189:
        name = "events_transactions_summary_by_thread_by_event_name.size";
        size = sizeof(PFS_transaction_stat);
        break;
      case 190:
        name = "events_transactions_summary_by_thread_by_event_name.count";
        size = global_thread_container.get_row_count() * transaction_class_max;
        break;
      case 191:
        name = "events_transactions_summary_by_thread_by_event_name.memory";
        size = global_thread_container.get_row_count() * transaction_class_max *
               sizeof(PFS_transaction_stat);
        total_memory += size;
        break;
      case 192:
        name = "events_transactions_summary_by_account_by_event_name.size";
        size = sizeof(PFS_transaction_stat);
        break;
      case 193:
        name = "events_transactions_summary_by_account_by_event_name.count";
        size = global_account_container.get_row_count() * transaction_class_max;
        break;
      case 194:
        name = "events_transactions_summary_by_account_by_event_name.memory";
        size = global_account_container.get_row_count() *
               transaction_class_max * sizeof(PFS_transaction_stat);
        total_memory += size;
        break;
      case 195:
        name = "events_transactions_summary_by_user_by_event_name.size";
        size = sizeof(PFS_transaction_stat);
        break;
      case 196:
        name = "events_transactions_summary_by_user_by_event_name.count";
        size = global_user_container.get_row_count() * transaction_class_max;
        break;
      case 197:
        name = "events_transactions_summary_by_user_by_event_name.memory";
        size = global_user_container.get_row_count() * transaction_class_max *
               sizeof(PFS_transaction_stat);
        total_memory += size;
        break;
      case 198:
        name = "events_transactions_summary_by_host_by_event_name.size";
        size = sizeof(PFS_transaction_stat);
        break;
      case 199:
        name = "events_transactions_summary_by_host_by_event_name.count";
        size = global_host_container.get_row_count() * transaction_class_max;
        break;
      case 200:
        name = "events_transactions_summary_by_host_by_event_name.memory";
        size = global_host_container.get_row_count() * transaction_class_max *
               sizeof(PFS_transaction_stat);
        total_memory += size;
        break;
      case 201:
        name = "table_lock_waits_summary_by_table.size";
        size = global_table_share_lock_container.get_row_size();
        break;
      case 202:
        name = "table_lock_waits_summary_by_table.count";
        size = global_table_share_lock_container.get_row_count();
        break;
      case 203:
        name = "table_lock_waits_summary_by_table.memory";
        size = global_table_share_lock_container.get_memory();
        total_memory += size;
        break;
      case 204:
        name = "table_io_waits_summary_by_index_usage.size";
        size = global_table_share_index_container.get_row_size();
        break;
      case 205:
        name = "table_io_waits_summary_by_index_usage.count";
        size = global_table_share_index_container.get_row_count();
        break;
      case 206:
        name = "table_io_waits_summary_by_index_usage.memory";
        size = global_table_share_index_container.get_memory();
        total_memory += size;
        break;
      case 207:
        name = "(history_long_statements_digest_token_array).count";
        size = events_statements_history_long_size;
        break;
      case 208:
        name = "(history_long_statements_digest_token_array).size";
        size = pfs_max_digest_length;
        break;
      case 209:
        name = "(history_long_statements_digest_token_array).memory";
        size = events_statements_history_long_size * pfs_max_digest_length;
        total_memory += size;
        break;
      case 210:
        name = "(history_statements_digest_token_array).count";
        size = global_thread_container.get_row_count() *
               events_statements_history_per_thread;
        break;
      case 211:
        name = "(history_statements_digest_token_array).size";
        size = pfs_max_digest_length;
        break;
      case 212:
        name = "(history_statements_digest_token_array).memory";
        size = global_thread_container.get_row_count() *
               events_statements_history_per_thread * pfs_max_digest_length;
        total_memory += size;
        break;
      case 213:
        name = "(current_statements_digest_token_array).count";
        size = global_thread_container.get_row_count() * statement_stack_max;
        break;
      case 214:
        name = "(current_statements_digest_token_array).size";
        size = pfs_max_digest_length;
        break;
      case 215:
        name = "(current_statements_digest_token_array).memory";
        size = global_thread_container.get_row_count() * statement_stack_max *
               pfs_max_digest_length;
        total_memory += size;
        break;
      case 216:
        name = "(history_long_statements_text_array).count";
        size = events_statements_history_long_size;
        break;
      case 217:
        name = "(history_long_statements_text_array).size";
        size = pfs_max_sqltext;
        break;
      case 218:
        name = "(history_long_statements_text_array).memory";
        size = events_statements_history_long_size * pfs_max_sqltext;
        total_memory += size;
        break;
      case 219:
        name = "(history_statements_text_array).count";
        size = global_thread_container.get_row_count() *
               events_statements_history_per_thread;
        break;
      case 220:
        name = "(history_statements_text_array).size";
        size = pfs_max_sqltext;
        break;
      case 221:
        name = "(history_statements_text_array).memory";
        size = global_thread_container.get_row_count() *
               events_statements_history_per_thread * pfs_max_sqltext;
        total_memory += size;
        break;
      case 222:
        name = "(current_statements_text_array).count";
        size = global_thread_container.get_row_count() * statement_stack_max;
        break;
      case 223:
        name = "(current_statements_text_array).size";
        size = pfs_max_sqltext;
        break;
      case 224:
        name = "(current_statements_text_array).memory";
        size = global_thread_container.get_row_count() * statement_stack_max *
               pfs_max_sqltext;
        total_memory += size;
        break;
      case 225:
        name = "(statements_digest_token_array).count";
        size = digest_max;
        break;
      case 226:
        name = "(statements_digest_token_array).size";
        size = pfs_max_digest_length;
        break;
      case 227:
        name = "(statements_digest_token_array).memory";
        size = digest_max * pfs_max_digest_length;
        total_memory += size;
        break;
      case 228:
        name = "events_errors_summary_by_thread_by_error.size";
        size = size_of_session_error_stat_buffer();
        break;
      case 229:
        name = "events_errors_summary_by_thread_by_error.count";
        size = global_thread_container.get_row_count() * error_class_max;
        break;
      case 230:
        name = "events_errors_summary_by_thread_by_error.memory";
        size = global_thread_container.get_row_count() * error_class_max *
               size_of_session_error_stat_buffer();
        total_memory += size;
        break;
      case 231:
        name = "events_errors_summary_by_account_by_error.size";
        size = size_of_session_error_stat_buffer();
        break;
      case 232:
        name = "events_errors_summary_by_account_by_error.count";
        size = global_account_container.get_row_count() * error_class_max;
        break;
      case 233:
        name = "events_errors_summary_by_account_by_error.memory";
        size = global_account_container.get_row_count() * error_class_max *
               size_of_session_error_stat_buffer();
        total_memory += size;
        break;
      case 234:
        name = "events_errors_summary_by_user_by_error.size";
        size = size_of_session_error_stat_buffer();
        break;
      case 235:
        name = "events_errors_summary_by_user_by_error.count";
        size = global_user_container.get_row_count() * error_class_max;
        break;
      case 236:
        name = "events_errors_summary_by_user_by_error.memory";
        size = global_user_container.get_row_count() * error_class_max *
               size_of_session_error_stat_buffer();
        total_memory += size;
        break;
      case 237:
        name = "events_errors_summary_by_host_by_error.size";
        size = size_of_session_error_stat_buffer();
        break;
      case 238:
        name = "events_errors_summary_by_host_by_error.count";
        size = global_host_container.get_row_count() * error_class_max;
        break;
      case 239:
        name = "events_errors_summary_by_host_by_error.memory";
        size = global_host_container.get_row_count() * error_class_max *
               size_of_session_error_stat_buffer();
        total_memory += size;
        break;
      case 240:
        name = "events_errors_summary_global_by_error.size";
        size = size_of_global_error_stat_buffer();
        break;
      case 241:
        name = "events_errors_summary_global_by_error.count";
        size = error_class_max;
        break;
      case 242:
        name = "events_errors_summary_global_by_error.memory";
        size = size_of_global_error_stat_buffer() * error_class_max;
        total_memory += size;
        break;
      case 243:
        name = "(pfs_buffer_scalable_container).count";
        size = builtin_memory_scalable_buffer.m_stat.m_alloc_count -
               builtin_memory_scalable_buffer.m_stat.m_free_count;
        break;
      case 244:
        name = "(pfs_buffer_scalable_container).memory";
        size = builtin_memory_scalable_buffer.m_stat.m_alloc_size -
               builtin_memory_scalable_buffer.m_stat.m_free_size;
        total_memory += size;
        break;
      case 245:
        name = "(max_global_server_errors).count";
        size = max_global_server_errors;
        break;
      case 246:
        name = "(max_session_server_errors).count";
        size = max_session_server_errors;
        break;
      /*
        This case must be last,
        for aggregation in total_memory.
      */
      case 247:
        name = "performance_schema.memory";
        size = total_memory;
        break;
      default:
        goto end;
        break;
    }

    buflen = (uint)(longlong10_to_str(size, buf, 10) - buf);
    if (print(thd, PERFORMANCE_SCHEMA_str.str, PERFORMANCE_SCHEMA_str.length,
              name, strlen(name), buf, buflen)) {
      return true;
    }
  }

end:
  return false;
}

static void inc_ref_count(PFS_engine_table_share *share) {
  std::atomic_fetch_add(&share->m_ref_count, 1);
}

static void dec_ref_count(PFS_engine_table_share *share) {
  std::atomic_fetch_sub(&share->m_ref_count, 1);
}

static int compare_database_names(const char *name1, const char *name2) {
  if (name1 == nullptr || name2 == nullptr) {
    return 1;
  }

  if (lower_case_table_names) {
    return native_strcasecmp(name1, name2);
  }
  return strcmp(name1, name2);
}

static PFS_engine_table_share *find_table_share(const char *db,
                                                const char *name) {
  DBUG_TRACE;

  if (compare_database_names(db, PERFORMANCE_SCHEMA_str.str) != 0) {
    return nullptr;
  }

  PFS_engine_table_share *result;
  result = PFS_engine_table::find_engine_table_share(name);
  return result;
}

/**
  Initialize Performance Schema tables in the Data Dictionary.

  Create strings representing the required performance schema tables,
  i.e. tables that InnoDB expects to exist in the DD, and add them
  to the appropriate out parameter.

  @param[in]      dict_init_mode  How to initialize files

  @param[in]      version         Target DD version if a new server
                                  is being installed.
                                  0 if restarting an existing server.

  @param[out]     tables          List of SQL DDL statements
                                  for creating DD tables that
                                  are needed by the DDSE.

  @param[out]     tablespaces     List of meta data for predefined
                                  tablespaces created by the DDSE.

  @retval true                    An error occurred.
  @retval false                   Success - no errors.
*/

static bool pfs_dict_init(dict_init_mode_t dict_init_mode,
                          uint version [[maybe_unused]],
                          List<const Plugin_table> *tables,
                          List<const Plugin_tablespace> *tablespaces
                          [[maybe_unused]]) {
  if (dict_init_mode != DICT_INIT_CREATE_FILES) {
    return false;
  }

  PFS_engine_table_share::get_all_tables(tables);
  return false;
}

static int pfs_init_func(void *p) {
  DBUG_TRACE;

  pfs_hton = reinterpret_cast<handlerton *>(p);

  pfs_hton->state = SHOW_OPTION_YES;
  pfs_hton->create = pfs_create_handler;
  pfs_hton->show_status = pfs_show_status;
  pfs_hton->dict_init = pfs_dict_init;

  pfs_hton->flags = HTON_ALTER_NOT_SUPPORTED | HTON_TEMPORARY_NOT_SUPPORTED |
                    HTON_NO_PARTITION | HTON_NO_BINLOG_ROW_OPT;

  /*
    As long as the server implementation keeps using legacy_db_type,
    as for example in mysql_truncate(),
    we can not rely on the fact that different mysqld process will assign
    consistently the same legacy_db_type for a given storage engine name.
    In particular, using different --loose-skip-xxx options between
    ./mysqld --initialize
    ./mysqld
    creates bogus .frm forms when bootstrapping the performance schema,
    if we rely on ha_initialize_handlerton to assign a really dynamic value.
    To fix this, a dedicated DB_TYPE is officially assigned to
    the performance schema. See Bug#43039.
  */
  pfs_hton->db_type = DB_TYPE_PERFORMANCE_SCHEMA;

  PFS_engine_table_share::init_all_locks();

  return 0;
}

static int pfs_done_func(void *) {
  DBUG_TRACE;

  pfs_hton = nullptr;

  PFS_engine_table_share::delete_all_locks();

  return 0;
}

static int show_func_mutex_instances_lost(THD *, SHOW_VAR *var, char *buff) {
  var->type = SHOW_LONG;
  var->value = buff;
  long *value = reinterpret_cast<long *>(buff);
  *value = global_mutex_container.get_lost_counter();
  return 0;
}

static SHOW_VAR pfs_status_vars[] = {
    {"Performance_schema_mutex_classes_lost", (char *)&mutex_class_lost,
     SHOW_LONG_NOFLUSH, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_rwlock_classes_lost", (char *)&rwlock_class_lost,
     SHOW_LONG_NOFLUSH, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_cond_classes_lost", (char *)&cond_class_lost,
     SHOW_LONG_NOFLUSH, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_thread_classes_lost", (char *)&thread_class_lost,
     SHOW_LONG_NOFLUSH, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_file_classes_lost", (char *)&file_class_lost,
     SHOW_LONG_NOFLUSH, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_socket_classes_lost", (char *)&socket_class_lost,
     SHOW_LONG_NOFLUSH, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_memory_classes_lost", (char *)&memory_class_lost,
     SHOW_LONG_NOFLUSH, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_mutex_instances_lost",
     (char *)&show_func_mutex_instances_lost, SHOW_FUNC, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_rwlock_instances_lost",
     (char *)&global_rwlock_container.m_lost, SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_cond_instances_lost",
     (char *)&global_cond_container.m_lost, SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_thread_instances_lost",
     (char *)&global_thread_container.m_lost, SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_file_instances_lost",
     (char *)&global_file_container.m_lost, SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_file_handles_lost", (char *)&file_handle_lost,
     SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_socket_instances_lost",
     (char *)&global_socket_container.m_lost, SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_locker_lost", (char *)&locker_lost, SHOW_LONG,
     SHOW_SCOPE_GLOBAL},
    /* table shares, can be flushed */
    {"Performance_schema_table_instances_lost",
     (char *)&global_table_share_container.m_lost, SHOW_LONG,
     SHOW_SCOPE_GLOBAL},
    /* table handles, can be flushed */
    {"Performance_schema_table_handles_lost",
     (char *)&global_table_container.m_lost, SHOW_LONG, SHOW_SCOPE_GLOBAL},
    /* table lock stats, can be flushed */
    {"Performance_schema_table_lock_stat_lost",
     (char *)&global_table_share_lock_container.m_lost, SHOW_LONG,
     SHOW_SCOPE_GLOBAL},
    /* table index stats, can be flushed */
    {"Performance_schema_index_stat_lost",
     (char *)&global_table_share_index_container.m_lost, SHOW_LONG,
     SHOW_SCOPE_GLOBAL},
    {"Performance_schema_hosts_lost", (char *)&global_host_container.m_lost,
     SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_users_lost", (char *)&global_user_container.m_lost,
     SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_accounts_lost",
     (char *)&global_account_container.m_lost, SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_stage_classes_lost", (char *)&stage_class_lost,
     SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_statement_classes_lost", (char *)&statement_class_lost,
     SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_digest_lost", (char *)&digest_lost, SHOW_LONG,
     SHOW_SCOPE_GLOBAL},
    {"Performance_schema_session_connect_attrs_lost",
     (char *)&session_connect_attrs_lost, SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_session_connect_attrs_longest_seen",
     (char *)&session_connect_attrs_longest_seen, SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_program_lost",
     (char *)&global_program_container.m_lost, SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_nested_statement_lost", (char *)&nested_statement_lost,
     SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {"Performance_schema_prepared_statements_lost",
     (char *)&global_prepared_stmt_container.m_lost, SHOW_LONG,
     SHOW_SCOPE_GLOBAL},
    {"Performance_schema_metadata_lock_lost",
     (char *)&global_mdl_container.m_lost, SHOW_LONG, SHOW_SCOPE_GLOBAL},
    {NullS, NullS, SHOW_LONG, SHOW_SCOPE_GLOBAL}};

struct st_mysql_storage_engine pfs_storage_engine = {
    MYSQL_HANDLERTON_INTERFACE_VERSION};

const char *pfs_engine_name = "PERFORMANCE_SCHEMA";

/* clang-format off */
mysql_declare_plugin(perfschema)
{
  MYSQL_STORAGE_ENGINE_PLUGIN,
  &pfs_storage_engine,
  pfs_engine_name,
  PLUGIN_AUTHOR_ORACLE,
  "Performance Schema",
  PLUGIN_LICENSE_GPL,
  pfs_init_func,                                /* Plugin Init */
  nullptr,                                         /* Plugin Check uninstall */
  pfs_done_func,                                /* Plugin Deinit */
  0x0001 /* 0.1 */,
  pfs_status_vars,                              /* status variables */
  nullptr,                                         /* system variables */
  nullptr,                                         /* config options */
  0,                                            /* flags */
}
mysql_declare_plugin_end;
/* clang-format on */

ha_perfschema::ha_perfschema(handlerton *hton, TABLE_SHARE *share)
    : handler(hton, share), m_table_share(nullptr), m_table(nullptr) {}

ha_perfschema::~ha_perfschema() = default;

int ha_perfschema::open(const char *, int, uint, const dd::Table *) {
  DBUG_TRACE;

  lock_pfs_external_table_shares();
  if (!m_table_share)
    m_table_share =
        find_table_share(table_share->db.str, table_share->table_name.str);
  if (!m_table_share) {
    unlock_pfs_external_table_shares();
    return HA_ERR_NO_SUCH_TABLE;
  }

  thr_lock_data_init(m_table_share->m_thr_lock_ptr, &m_thr_lock, nullptr);
  ref_length = m_table_share->m_ref_length;

  /* Only for table added by plugin/components */
  if (!IS_NATIVE_TABLE(m_table_share)) {
    inc_ref_count(m_table_share);
  }

  unlock_pfs_external_table_shares();
  return 0;
}

int ha_perfschema::close(void) {
  DBUG_TRACE;

  /* Only for table added by plugin/components */
  if (!IS_NATIVE_TABLE(m_table_share)) {
    dec_ref_count(m_table_share);
  }

  m_table_share = nullptr;
  delete m_table;
  m_table = nullptr;

  return 0;
}

int ha_perfschema::write_row(uchar *buf) {
  int result;

  DBUG_TRACE;
  if (!PFS_ENABLED()) {
    return HA_ERR_WRONG_COMMAND;
  }

  assert(m_table_share);
  if (m_table == nullptr) {
    m_table = m_table_share->m_open_table(m_table_share);
  }
  ha_statistic_increment(&System_status_var::ha_write_count);
  result = m_table_share->write_row(m_table, table, buf, table->field);
  return result;
}

void ha_perfschema::use_hidden_primary_key(void) {
  /*
    This is also called in case of row based replication,
    see TABLE::mark_columns_needed_for_update().
    Add all columns to the read set, but do not touch the write set,
    as some columns in the SETUP_ tables are not writable.
  */
  table->column_bitmaps_set_no_signal(&table->s->all_set, table->write_set);
}

int ha_perfschema::update_row(const uchar *old_data, uchar *new_data) {
  DBUG_TRACE;
  if (!PFS_ENABLED()) {
    return HA_ERR_WRONG_COMMAND;
  }

  if (is_executed_by_slave()) {
    return 0;
  }

  assert(m_table);
  ha_statistic_increment(&System_status_var::ha_update_count);
  int result = m_table->update_row(table, old_data, new_data, table->field);
  return result;
}

int ha_perfschema::delete_row(const uchar *buf) {
  DBUG_TRACE;
  if (!PFS_ENABLED()) {
    return HA_ERR_WRONG_COMMAND;
  }

  assert(m_table);
  ha_statistic_increment(&System_status_var::ha_delete_count);
  int result = m_table->delete_row(table, buf, table->field);
  return result;
}

int ha_perfschema::rnd_init(bool scan) {
  int result;
  DBUG_TRACE;

  assert(m_table_share);
  assert(m_table_share->m_open_table != nullptr);

  stats.records = 0;
  if (m_table == nullptr) {
    m_table = m_table_share->m_open_table(m_table_share);
  } else {
    m_table->reset_position();
  }

  if (m_table != nullptr) {
    m_table->rnd_init(scan);
  }

  result = m_table ? 0 : HA_ERR_OUT_OF_MEM;
  return result;
}

int ha_perfschema::rnd_end(void) {
  DBUG_TRACE;
  assert(m_table);
  delete m_table;
  m_table = nullptr;
  return 0;
}

int ha_perfschema::rnd_next(uchar *buf) {
  DBUG_TRACE;
  if (!PFS_ENABLED()) {
    return HA_ERR_END_OF_FILE;
  }

  assert(m_table);
  ha_statistic_increment(&System_status_var::ha_read_rnd_next_count);

  int result = m_table->rnd_next();
  if (result == 0) {
    result = m_table->read_row(table, buf, table->field);
    if (result == 0) {
      stats.records++;
    }
  }
  return result;
}

void ha_perfschema::position(const uchar *) {
  DBUG_TRACE;

  assert(m_table);
  m_table->get_position(ref);
}

int ha_perfschema::rnd_pos(uchar *buf, uchar *pos) {
  DBUG_TRACE;
  if (!PFS_ENABLED()) {
    return HA_ERR_END_OF_FILE;
  }

  assert(m_table);
  ha_statistic_increment(&System_status_var::ha_read_rnd_count);
  int result = m_table->rnd_pos(pos);
  if (result == 0) {
    result = m_table->read_row(table, buf, table->field);
  }
  return result;
}

int ha_perfschema::info(uint flag) {
  DBUG_TRACE;
  assert(m_table_share);
  if (flag & HA_STATUS_VARIABLE) {
    stats.records = m_table_share->get_row_count();
  }
  if (flag & HA_STATUS_CONST) {
    ref_length = m_table_share->m_ref_length;
  }
  return 0;
}

int ha_perfschema::delete_all_rows(void) {
  int result;

  DBUG_TRACE;
  if (!PFS_ENABLED()) {
    return 0;
  }

  if (is_executed_by_slave()) {
    return 0;
  }

  assert(m_table_share);
  if (m_table_share->m_delete_all_rows) {
    result = m_table_share->m_delete_all_rows();
  } else {
    result = HA_ERR_WRONG_COMMAND;
  }
  return result;
}

int ha_perfschema::truncate(dd::Table *) { return delete_all_rows(); }

THR_LOCK_DATA **ha_perfschema::store_lock(THD *, THR_LOCK_DATA **to,
                                          enum thr_lock_type lock_type) {
  if (lock_type != TL_IGNORE && m_thr_lock.type == TL_UNLOCK) {
    m_thr_lock.type = lock_type;
  }
  *to++ = &m_thr_lock;
  m_thr_lock.m_psi = m_psi;
  return to;
}

int ha_perfschema::delete_table(const char *, const dd::Table *) {
  DBUG_TRACE;
  return 0;
}

int ha_perfschema::rename_table(const char *, const char *, const dd::Table *,
                                dd::Table *) {
  DBUG_TRACE;
  return HA_ERR_WRONG_COMMAND;
}

int ha_perfschema::create(const char *, TABLE *table_arg, HA_CREATE_INFO *,
                          dd::Table *) {
  DBUG_TRACE;
  assert(table_arg);
  assert(table_arg->s);
  lock_pfs_external_table_shares();
  if (find_table_share(table_arg->s->db.str, table_arg->s->table_name.str)) {
    /*
      Attempting to create a known performance schema table.
      Allowing the create, to create .FRM files,
      for the initial database install, and mysql_upgrade.
      This should fail once .FRM are removed.
    */
    unlock_pfs_external_table_shares();
    return 0;
  }

  /*
    This is not a general purpose engine.
    Failure to CREATE TABLE is the expected result.
  */
  unlock_pfs_external_table_shares();
  return HA_ERR_WRONG_COMMAND;
}

void ha_perfschema::print_error(int error, myf errflag) {
  switch (error) {
    case HA_ERR_TABLE_NEEDS_UPGRADE:
      /*
        The error message for ER_TABLE_NEEDS_UPGRADE refers to REPAIR table,
        which does not apply to performance schema tables.
      */
      my_error(ER_WRONG_NATIVE_TABLE_STRUCTURE, MYF(0), table_share->db.str,
               table_share->table_name.str);
      break;
    case HA_ERR_WRONG_COMMAND:
      /*
        The performance schema is not a general purpose storage engine,
        some operations are not supported, by design.
        We do not want to print "Command not supported",
        which gives the impression that a command implementation is missing,
        and that the failure should be considered a bug.
        We print "Invalid performance_schema usage." instead,
        to emphasise that the operation attempted is not meant to be legal,
        and that the failure returned is indeed the expected result.
      */
      my_error(ER_WRONG_PERFSCHEMA_USAGE, MYF(0));
      break;
    default:
      handler::print_error(error, errflag);
      break;
  }
}

const char *ha_perfschema::index_type(uint) { return ""; }

ulong ha_perfschema::index_flags(uint, uint, bool) const {
  const PFS_engine_table_share *tmp;

  lock_pfs_external_table_shares();
  if (m_table_share != nullptr) {
    tmp = m_table_share;
  } else {
    tmp = find_table_share(table_share->db.str, table_share->table_name.str);
    /* ha_perfschema::index_flags is const, can not save in m_table_share. */
  }

  ulong flags = HA_KEY_SCAN_NOT_ROR;

  if (!tmp) {
    unlock_pfs_external_table_shares();
    return 0;
  }

  unlock_pfs_external_table_shares();
  return flags;
}

/**
  Initializes a handle to use an index.
  @return 0 or error number
*/
int ha_perfschema::index_init(uint idx, bool sorted) {
  int result;
  DBUG_TRACE;

  assert(m_table_share);
  assert(m_table_share->m_open_table != nullptr);

  if (m_table == nullptr) {
    m_table = m_table_share->m_open_table(m_table_share);
  } else {
    m_table->reset_position();
  }

  active_index = idx;

  if (m_table) {
    result = m_table->index_init(idx, sorted);
  } else {
    result = HA_ERR_OUT_OF_MEM;
  }

  return result;
}

int ha_perfschema::index_end() {
  DBUG_TRACE;
  assert(m_table);
  assert(active_index != MAX_KEY);
  delete m_table;
  m_table = nullptr;
  active_index = MAX_KEY;
  return 0;
}

/**
  Positions an index cursor to the index specified in the handle. Fetches the
  row if any.
  @return 0, HA_ERR_KEY_NOT_FOUND, or error
*/
int ha_perfschema::index_read(uchar *buf, const uchar *key, uint key_len,
                              enum ha_rkey_function find_flag) {
  DBUG_TRACE;
  if (!PFS_ENABLED()) {
    return HA_ERR_END_OF_FILE;
  }

  assert(m_table_share);
  assert(m_table_share->m_open_table != nullptr);

  if (m_table == nullptr) {
    m_table = m_table_share->m_open_table(m_table_share);
  } else {
    m_table->reset_position();
  }

  assert(m_table);
  ha_statistic_increment(&System_status_var::ha_read_key_count);

  assert(table != nullptr);
  assert(table->s != nullptr);
  assert(table->s->key_info != nullptr);
  KEY *key_infos = table->s->key_info;

  int result =
      m_table->index_read(key_infos, active_index, key, key_len, find_flag);
  if (result == 0) {
    result = m_table->read_row(table, buf, table->field);
  }
  return result;
}

/**
  Reads the next row from a cursor, which must have previously been
  positioned by index_read.
  @return 0, HA_ERR_END_OF_FILE, or error
*/
int ha_perfschema::index_next(uchar *buf) {
  DBUG_TRACE;
  if (!PFS_ENABLED()) {
    return HA_ERR_END_OF_FILE;
  }

  ha_statistic_increment(&System_status_var::ha_read_next_count);

  assert(m_table);

  int result = m_table->index_next();
  if (result == 0) {
    result = m_table->read_row(table, buf, table->field);
  }
  return result;
}

/**
  Reads the next row matching the given key value.
  @return 0, HA_ERR_END_OF_FILE, or error
*/
int ha_perfschema::index_next_same(uchar *buf, const uchar *key, uint keylen) {
  DBUG_TRACE;
  if (!PFS_ENABLED()) {
    return HA_ERR_END_OF_FILE;
  }

  ha_statistic_increment(&System_status_var::ha_read_next_count);

  assert(m_table);

  int result = m_table->index_next_same(key, keylen);
  if (result == 0) {
    result = m_table->read_row(table, buf, table->field);
  }

  return result;
}

bool ha_perfschema::is_executed_by_slave() const {
  assert(table != nullptr);
  assert(table->in_use != nullptr);
  return table->in_use->slave_thread;
}
