Jason Cu 2bf9f0d422 MDEV-32395: update_depend_map_for_order: SEGV at /mariadb-11.3.0/sql/sql_select.cc:16583 ...

MDEV-32329 (patch) pushdown from having into where: Server crashes at sub_select

When generating an Item_equal with a Item_ref that refers to a field
outside of a subselect, remove_item_direct_ref() causes the dependency
(depended_from) on the outer select to be lost, which causes trouble
for code downstream that can no longer determine the scope of the Item.
Not calling remove_item_direct_ref() retains the Item's dependency.

Test cases from MDEV-32395 and MDEV-32329 are included.

Some fixes from other developers:

Monty:
- Fixed wrong code in Item_equal::create_pushable_equalities()
  that could cause wrong item to be used if there was no matching items.
Daniel Black:
- Added test cases from MDEV-32329
Igor Babaev:
- Provided fix for removing call to remove_item_direct_ref() in
  eliminate_item_equal()

MDEV-32395: update_depend_map_for_order: SEGV at /mariadb-11.3.0/sql/sql_select.cc:16583

Include test cases from MDEV-32329.

2024-12-04 13:22:45 +02:00

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