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mariadb/mysql-test/t
Sergei Petrunia c72c77ca3b MDEV-24925: Server crashes in Item_subselect::init_expr_cache_tracker
(trivial backport to 10.2)
The optimizer removes redundant GROUP BY operations. If GROUP BY element
is a subselect, it is "eliminated".

However one must not eliminate the item if it is used both in the select
list and in the GROUP BY, like so:

  select (select ... ) as SUBQ from ... group by SUBQ

Do not eliminate such items.
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