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optimized single value subselect (to be used as row) (SCRUM)

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This commit is contained in:
bell@sanja.is.com.ua
2002-12-19 07:38:32 +02:00
parent b96a17a817
commit b785e980bd
4 changed files with 154 additions and 66 deletions
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26
sql/sql_class.cc
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@ -932,31 +932,7 @@ bool select_singleval_subselect::send_data(List<Item> &items)
}
List_iterator_fast<Item> li(items);
Item *val_item= li++; // Only one (single value subselect)
/*
Following val() call have to be first, because function AVG() & STD()
calculate value on it & determinate "is it NULL?".
*/
it->real_value= val_item->val_result();
if ((it->null_value= val_item->null_value))
{
it->reset();
}
else
{
it->max_length= val_item->max_length;
it->decimals= val_item->decimals;
it->set_charset(val_item->charset());
it->int_value= val_item->val_int_result();
String *s= val_item->str_result(&it->string_value);
if (s != &it->string_value)
{
it->string_value.set(*s, 0, s->length());
}
// TODO: remove when correct charset handling appeared for Item
it->str_value.set(*s, 0, s->length()); // store charset
it->res_type= val_item->result_type();
}
it->store(val_item);
it->assigned(1);
DBUG_RETURN(0);
}