Function normalize_cond

sql/sql_parse.cc:8976–9006

*/

Item *normalize_cond(THD *thd, Item *cond)
{
  if (cond)
  {
    Item::Type type= cond->type();
    if (type == Item::FIELD_ITEM || type == Item::REF_ITEM)
    {
      item_base_t is_cond_flag= cond->base_flags &
        (item_base_t::IS_COND | item_base_t::AT_TOP_LEVEL);
      cond->base_flags&= ~item_base_t::IS_COND;
      cond= new (thd->mem_root) Item_func_istrue(thd, cond);
      if (cond)
        cond->base_flags|= is_cond_flag;
    }
    else
    {
      if (type == Item::FUNC_ITEM)
      {
        Item_func *func_item= (Item_func *)cond;
        if (func_item->functype() == Item_func::NOT_FUNC)
        {
          Item *arg= func_item->arguments()[0];
          if (arg->type() == Item::FIELD_ITEM ||
              arg->type() == Item::REF_ITEM)
            cond= new (thd->mem_root) Item_func_isfalse(thd, arg);
        }
      }
    }
  }
  return cond;
}


/**