Function check_unique_table

sql/sql_update.cc:1434–1444

Check that we are not using table that we are updating in a sub select @param thd Thread handle @param table_list List of table with first to check @retval TRUE Error @retval FALSE OK */

  @retval FALSE OK
*/
bool check_unique_table(THD *thd, TABLE_LIST *table_list)
{
  TABLE_LIST *duplicate;
  DBUG_ENTER("check_unique_table");
  if ((duplicate= unique_table(thd, table_list, table_list->next_global, 0)))
  {
    update_non_unique_table_error(table_list, "UPDATE", duplicate);
    DBUG_RETURN(TRUE);
  }
  DBUG_RETURN(FALSE);
}

/***************************************************************************
  Update multiple tables from join