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Bug#48052: Valgrind warning - uninitialized value in

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init_read_record() - (records.cc:274)
      
Item_cond::used_tables_cache was accessed in
records.cc#init_read_record() without being initialized. It had
not been initialized because it was wrongly assumed that the
Item's variables would not be accessed, and hence
quick_fix_field() was used instead of fix_fields() to save a few
CPU cycles at creation time.

The fix is to properly initilize the Item by replacing
quick_fix_field() with fix_fields().


mysql-test/r/select.result:
  Add test for BUG#48052
mysql-test/t/select.test:
  Add test for BUG#48052
sql/sql_select.cc:
  Properly initialize Item_cond_and by calling fix_fields (instead of quick_fix_field) when the Item that "ANDs" WHERE clause conditions with HAVING clause conditions is created.
This commit is contained in:
Jorgen Loland
2009-11-13 12:22:39 +01:00
parent cf872354a8
commit a120e969a8
3 changed files with 53 additions and 6 deletions
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8
sql/sql_select.cc
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@@ -2131,17 +2131,13 @@ JOIN::exec()
DBUG_VOID_RETURN;
if (!curr_table->select->cond)
curr_table->select->cond= sort_table_cond;
else // This should never happen
else
{
if (!(curr_table->select->cond=
new Item_cond_and(curr_table->select->cond,
sort_table_cond)))
DBUG_VOID_RETURN;
/*
Item_cond_and do not need fix_fields for execution, its parameters
are fixed or do not need fix_fields, too
*/
curr_table->select->cond->quick_fix_field();
curr_table->select->cond->fix_fields(thd, 0);
}
curr_table->select_cond= curr_table->select->cond;
curr_table->select_cond->top_level_item();