Method add_index_hint

sql/sql_lex.cc:3407–3413

adds an element to the array storing index usage hints (ADD/FORCE/IGNORE INDEX). SYNOPSIS add_index_hint() thd current thread. str name of the index. length number of characters in str. RETURN VALUE 0 on success, non-zero otherwise */

    0 on success, non-zero otherwise
*/
bool st_select_lex::add_index_hint (THD *thd, char *str, uint length)
{
  return index_hints->push_front (new (thd->mem_root) 
                                 Index_hint(current_index_hint_type,
                                            current_index_hint_clause,
                                            str, length));
}


st_select_lex::type_enum st_select_lex::type(const THD *thd)