Function open_ltable

sql/sql_base.cc:5683–5769

*/

TABLE *open_ltable(THD *thd, TABLE_LIST *table_list, thr_lock_type lock_type,
                   uint lock_flags)
{
  TABLE *table;
  Open_table_context ot_ctx(thd, lock_flags);
  bool error;
  DBUG_ENTER("open_ltable");

  /* Ignore temporary tables as they have already been opened. */
  if (table_list->table)
    DBUG_RETURN(table_list->table);

  THD_STAGE_INFO(thd, stage_opening_tables);
  thd->current_tablenr= 0;
  /* open_ltable can be used only for BASIC TABLEs */
  table_list->required_type= TABLE_TYPE_NORMAL;

  /* This function can't properly handle requests for such metadata locks. */
  DBUG_ASSERT(lock_flags & MYSQL_OPEN_HAS_MDL_LOCK  ||
              table_list->mdl_request.type < MDL_SHARED_UPGRADABLE);

  while ((error= open_table(thd, table_list, &ot_ctx)) &&
         ot_ctx.can_recover_from_failed_open())
  {
    /*
      Even though we have failed to open table we still need to
      call release_transactional_locks() to release metadata locks which
      might have been acquired successfully.
    */
    thd->mdl_context.rollback_to_savepoint(ot_ctx.start_of_statement_svp());
    table_list->mdl_request.ticket= 0;
    if (ot_ctx.recover_from_failed_open())
      break;
  }

  if (likely(!error))
  {
    /*
      We can't have a view or some special "open_strategy" in this function
      so there should be a TABLE instance.
    */
    DBUG_ASSERT(table_list->table);
    table= table_list->table;
    if (table->file->ha_table_flags() & HA_CAN_MULTISTEP_MERGE)
    {
      /* A MERGE table must not come here. */
      /* purecov: begin tested */
      my_error(ER_WRONG_OBJECT, MYF(0), table->s->db.str,
               table->s->table_name.str, "BASE TABLE");
      table= 0;
      goto end;
      /* purecov: end */
    }

    table_list->lock_type= lock_type;
    table->grant= table_list->grant;
    if (thd->locked_tables_mode)
    {