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Bug#34773: query with explain extended and derived table / other table

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crashes server

When creating temporary table that contains aggregate functions a 
non-reversible source transformation was performed to redirect aggregate
function arguments towards temporary table columns.
This caused EXPLAIN EXTENDED to fail because it was trying to resolve
references to the (freed) temporary table.
Fixed by preserving the original aggregate function arguments and
using them (instead of the transformed ones) for EXPLAIN EXTENDED.
This commit is contained in:
Georgi Kodinov
2008-10-06 17:17:25 +03:00
parent 77e54c03ac
commit b5f152dcd8
8 changed files with 143 additions and 24 deletions
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2
sql/opt_range.cc
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@ -9157,7 +9157,7 @@ get_best_group_min_max(PARAM *param, SEL_TREE *tree)
DBUG_RETURN(NULL);
/* The argument of MIN/MAX. */
Item *expr= min_max_item->args[0]->real_item();
Item *expr= min_max_item->get_arg(0)->real_item();
if (expr->type() == Item::FIELD_ITEM) /* Is it an attribute? */
{
if (! min_max_arg_item)