Function run_set_statement_if_requested

sql/sql_parse.cc:3346–3474

*/

bool run_set_statement_if_requested(THD *thd, LEX *lex)
{
  if (!lex->stmt_var_list.is_empty() && !thd->slave_thread)
  {
    Query_arena backup;
    DBUG_PRINT("info", ("SET STATEMENT %d vars", lex->stmt_var_list.elements));

    lex->old_var_list.empty();
    List_iterator_fast<set_var_base> it(lex->stmt_var_list);
    set_var_base *var;

    if (lex->set_arena_for_set_stmt(&backup))
      return true;

    MEM_ROOT *mem_root= thd->mem_root;
    while ((var= it++))
    {
      DBUG_ASSERT(var->is_system());
      set_var *o= NULL, *v= (set_var*)var;
      if (!v->var->is_set_stmt_ok())
      {
        my_error(ER_SET_STATEMENT_NOT_SUPPORTED, MYF(0), v->var->name.str);
        lex->reset_arena_for_set_stmt(&backup);
        lex->old_var_list.empty();
        lex->free_arena_for_set_stmt();
        return true;
      }
      if (v->var->session_is_default(thd))
        o= new set_var(thd,v->type, v->var, &v->base, NULL);
      else
      {
        switch (v->var->option.var_type & GET_TYPE_MASK)
        {
          case GET_BIT:
          case GET_BOOL:
          case GET_INT:
          case GET_LONG:
          case GET_LL:
          {
            bool null_value;
            longlong val= v->var->val_int(&null_value, thd, v->type, &v->base);
            o= new set_var(thd, v->type, v->var, &v->base,
                           (null_value ?
                            (Item *) new (mem_root) Item_null(thd) :
                            (Item *) new (mem_root) Item_int(thd, val)));
          }
          break;
          case GET_UINT:
          case GET_ULONG:
          case GET_ULL:
          {
            bool null_value;
            ulonglong val= v->var->val_int(&null_value, thd, v->type, &v->base);
            o= new set_var(thd, v->type, v->var, &v->base,
                           (null_value ?
                            (Item *) new (mem_root) Item_null(thd) :
                            (Item *) new (mem_root) Item_uint(thd, val)));
          }