Method cleanup

sql/sql_class.cc:1702–1772

/* Do operations that may take a long time */

void THD::cleanup(void)
{
  DBUG_ENTER("THD::cleanup");
  DBUG_ASSERT(cleanup_done == 0);

  set_killed(KILL_CONNECTION);
#ifdef WITH_WSREP
  if (wsrep_cs().state() != wsrep::client_state::s_none)
    wsrep_cs().cleanup();
  wsrep_client_thread= false;
#endif /* WITH_WSREP */

  DEBUG_SYNC(this, "THD_cleanup_after_set_killed");

  mysql_ha_cleanup(this);
  locked_tables_list.unlock_locked_tables(this);

  delete_dynamic(&user_var_events);
  close_temporary_tables();

  if (transaction->xid_state.is_explicit_XA())
    trans_xa_detach(this);
  else
    trans_rollback(this);

  DEBUG_SYNC(this, "THD_cleanup_after_trans_cleanup");

  DBUG_ASSERT(open_tables == NULL);
  DBUG_ASSERT(m_transaction_psi == NULL);

  /*
    If the thread was in the middle of an ongoing transaction (rolled
    back a few lines above) or under LOCK TABLES (unlocked the tables
    and left the mode a few lines above), there will be outstanding
    metadata locks. Release them.
  */
  mdl_context.release_transactional_locks(this);

  backup_end(this);
  backup_unlock(this);

  /* Release the global read lock, if acquired. */
  if (global_read_lock.is_acquired())
    global_read_lock.unlock_global_read_lock(this);

  if (user_connect)
  {
    decrease_user_connections(user_connect);
    user_connect= 0;                            // Safety
  }
  wt_thd_destroy(&transaction->wt);

  my_hash_free(&user_vars);
  my_hash_free(&sequences);
  sp_caches_clear();
  statement_rcontext_reinit();
  auto_inc_intervals_forced.empty();
  auto_inc_intervals_in_cur_stmt_for_binlog.empty();