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Merge mysql.com:/home/emurphy/src/bk-clean/tmp_merge

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into  mysql.com:/home/emurphy/src/bk-clean/mysql-5.1
This commit is contained in:
elliot@mysql.com
2006-06-23 17:27:54 -04:00
parent ebe57fc707 6043f29810
commit d4796d9df6
8 changed files with 96 additions and 73 deletions
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32
sql/item_cmpfunc.cc
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@@ -80,9 +80,6 @@ static void agg_result_type(Item_result *type, Item **items, uint nitems)
NOTES
Aggregation rules:
If all items are constants the type will be aggregated from all items.
If there are some non-constant items then only types of non-constant
items will be used for aggregation.
If there are DATE/TIME fields/functions in the list and no string
fields/functions in the list then:
The INT_RESULT type will be used for aggregation instead of original
@@ -169,34 +166,29 @@ static void agg_cmp_type(THD *thd, Item_result *type, Item **items, uint nitems)
}
}
}
/* Reset to 0 on first occurence of non-const item. 1 otherwise */
bool is_const= items[0]->const_item();
/*
If the first item is a date/time function then its result should be
compared as int
*/
if (field)
{
/* Suppose we are comparing dates and some non-constant items are present. */
/* Suppose we are comparing dates */
type[0]= INT_RESULT;
is_const= 0;
}
else
type[0]= items[0]->result_type();
for (i= 0; i < nitems ; i++)
{
if (!items[i]->const_item())
{
Item_result result= field && items[i]->result_as_longlong() ?
INT_RESULT : items[i]->result_type();
type[0]= is_const ? result : item_cmp_type(type[0], result);
is_const= 0;
}
else if (is_const)
type[0]= item_cmp_type(type[0], items[i]->result_type());
else if (field)
convert_constant_item(thd, field, &items[i]);
Item_result result= items[i]->result_type();
/*
Use INT_RESULT as result type for DATE/TIME fields/functions and
for constants successfully converted to DATE/TIME
*/
if (field &&
((!items[i]->const_item() && items[i]->result_as_longlong()) ||
(items[i]->const_item() && convert_constant_item(thd, field,
&items[i]))))
result= INT_RESULT;
type[0]= item_cmp_type(type[0], result);
}
if (res == Item::FUNC_ITEM && field)