At file:///home/psergey/dev/mariadb-5.1-knielsen/
------------------------------------------------------------
revno: 2797
revision-id: psergey@askmonty.org-20100309100049-n986bg9spx4mlamp
parent: knielsen@knielsen-hq.org-20100304080603-qq61atw8t0im9qf4
committer: Sergey Petrunya
branch nick: mariadb-5.1-knielsen
timestamp: Tue 2010-03-09 13:00:49 +0300
message:
Fixed valgrind failure in select_describe(), read of uninitialized
Item_subselect::eliminated:
- it turns out we can call select_describe() without having fixed
subquery items for child subselects. These are not the kind of subqueries
that we could eliminate, so the fix is to ensure that
item_subselect->eliminated==FALSE even before fix_fields is called.
Also added code to reset item_subselect->eliminated back to FALSE in
Item::reset() call.
=== modified file 'sql/item_subselect.cc'
--- a/sql/item_subselect.cc 2010-01-15 15:27:55 +0000
+++ b/sql/item_subselect.cc 2010-03-09 10:00:49 +0000
@@ -39,7 +39,8 @@
Item_subselect::Item_subselect():
Item_result_field(), value_assigned(0), thd(0), substitution(0),
engine(0), old_engine(0), used_tables_cache(0), have_to_be_excluded(0),
- const_item_cache(1), in_fix_fields(0), engine_changed(0), changed(0), is_correlated(FALSE)
+ const_item_cache(1), in_fix_fields(0), eliminated(FALSE),
+ engine_changed(0), changed(0), is_correlated(FALSE)
{
with_subselect= 1;
reset();
@@ -431,6 +432,7 @@
void Item_singlerow_subselect::reset()
{
+ eliminated= FALSE;
null_value= 1;
if (value)
value->null_value= 1;
=== modified file 'sql/item_subselect.h'
--- a/sql/item_subselect.h 2010-01-15 15:27:55 +0000
+++ b/sql/item_subselect.h 2010-03-09 10:00:49 +0000
@@ -90,6 +90,7 @@
void cleanup();
virtual void reset()
{
+ eliminated= FALSE;
null_value= 1;
}
virtual trans_res select_transformer(JOIN *join);
@@ -235,6 +236,7 @@
subs_type substype() { return EXISTS_SUBS; }
void reset()
{
+ eliminated= FALSE;
value= 0;
}
@@ -306,6 +308,7 @@
subs_type substype() { return IN_SUBS; }
void reset()
{
+ eliminated= FALSE;
value= 0;
null_value= 0;
was_null= 0;
