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MDEV-16765: Missing rows with pushdown condition defined with CASE using Item_cond

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The bug appears because of the wrong pushdown into the WHERE clause of the
materialized derived table/view work. For the excl_dep_on_grouping_fields()
method that checks if the condition can be pushed into the WHERE clause
the case when Item_cond is used is missing. For Item_cond elements this
method always returns positive result (that condition can be pushed).
So this condition is pushed even if is shouldn't be pushed.

To fix it new Item_cond::excl_dep_on_grouping_fields() method is added.
This commit is contained in:
Galina Shalygina 2018-08-20 17:42:49 +03:00
commit 0de3c423cc
4 changed files with 275 additions and 0 deletions
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13
sql/item_cmpfunc.cc
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@ -4970,6 +4970,19 @@ Item *Item_cond::build_clone(THD *thd, MEM_ROOT *mem_root)
}
bool Item_cond::excl_dep_on_grouping_fields(st_select_lex *sel)
{
List_iterator_fast<Item> li(list);
Item *item;
while ((item= li++))
{
if (!item->excl_dep_on_grouping_fields(sel))
return false;
}
return true;
}
void Item_cond_and::mark_as_condition_AND_part(TABLE_LIST *embedding)
{
List_iterator<Item> li(list);