* Better self-recursion protection in Item_subselect::fix_fields.
Don't go into branch that calls upper_refs.empty() more than once per PREPARE or EXECUTE * Avoid crashing when processing references to outside from subquery's HAVING (will explain in more details in email) sql/item.h: * Avoid crashing when processing references to outside from subquery's HAVING (will explain in more details in email) sql/item_subselect.cc: * Better self-recursion protection in Item_subselect::fix_fields. Don't go into branch that calls upper_refs.empty() more than once per PREPARE or EXECUTE
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