Method resolve_optimizer_hints

sql/opt_hints.cc:1813–1834

@brief Perform "Hint Resolution" for Optimizer Hints (see opt_hints.h for definition). @detail Hints use "Explain select numbering", so this must be called after the call to LEX::fix_first_select_number(). On the other hand, this must be called before the first attempt to check any hint. */

    any hint.
*/
void LEX::resolve_optimizer_hints()
{
  if (selects_for_hint_resolution.is_empty())
    return;

  Query_arena *arena, backup;
  arena= thd->activate_stmt_arena_if_needed(&backup);

  List_iterator<SELECT_LEX> it(selects_for_hint_resolution);
  SELECT_LEX *sel;
  while ((sel= it++))
  {
    if (!sel->parsed_optimizer_hints)
      continue;
    Parse_context pc(thd, sel);
    sel->parsed_optimizer_hints->resolve(&pc);
  }

  selects_for_hint_resolution.empty();
  if (arena)
    thd->restore_active_arena(arena, &backup);
}


#ifndef DBUG_OFF