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bsrikanth-mariadb dc28140c89 MDEV-31255: Crash with fulltext search subquery in explain delete/update 
ft_handler isn't getting initialized for subqueries inside explain
delete/update queries. However, ft_handler is accessed inside ha_ft_read(),
and is the reason for NULL pointer exception.
This is not the case with non-explain delete/update queries, as
well as explain/non-explain select queries.

Follow the approach the SELECT statements are using in
JOIN::optimize_constant_subqueries(): remove SELECT_DESCRIBE
flag when invoking optimization of constant subqueries.

Single-table UPDATE/DELETEs have SELECT_LEX but don't have JOIN.
So, we make optimize_constant_subqueries() not to be a member
of JOIN class, and instead move it to SELECT_LEX, and then
invoke it from single-table UPDATE/DELETE as well as for SELECT queries.
2026-01-27 16:42:41 +05:30
..
r MDEV-31255: Crash with fulltext search subquery in explain delete/update 2026-01-27 16:42:41 +05:30
t MDEV-31255: Crash with fulltext search subquery in explain delete/update 2026-01-27 16:42:41 +05:30