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Fixed bug in MAX() optimization when used with JOIN and ON expressions

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(Patch from 4.0.5)
This commit is contained in:
monty@hundin.mysql.fi
2002-12-02 13:41:08 +02:00
parent f89d91c53c
commit fab1fcea8b
5 changed files with 100 additions and 1 deletions
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39
sql/item_cmpfunc.cc
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@@ -1207,6 +1207,45 @@ longlong Item_cond_or::val_int()
return 0;
}
/*
Create an AND expression from two expressions
SYNOPSIS
and_expressions()
a expression or NULL
b expression.
org_item Don't modify a if a == *org_item
If a == NULL, org_item is set to point at b,
to ensure that future calls will not modify b.
NOTES
This will not modify item pointed to by org_item or b
The idea is that one can call this in a loop and create and
'and' over all items without modifying any of the original items.
RETURN
NULL Error
Item
*/
Item *and_expressions(Item *a, Item *b, Item **org_item)
{
if (!a)
return (*org_item= (Item*) b);
if (a == *org_item)
{
Item_cond *res;
if ((res= new Item_cond_and(a, (Item*) b)))
res->used_tables_cache= a->used_tables() | b->used_tables();
return res;
}
if (((Item_cond_and*) a)->add((Item*) b))
return 0;
((Item_cond_and*) a)->used_tables_cache|= b->used_tables();
return a;
}
longlong Item_func_isnull::val_int()
{
/*