MDEV-13784: query causes seg fault
When we have a nested subquery then a subquery that was a dependent subquery may change to an independent one when we optimizer the inner subqueries. This is handled st_select_lex::optimize_unflattened_subqueries. Currently a subquery that was changed to independent from dependent after optimization phase incorrectly shows dependent in the output of Explain, this happens because we don't update used_tables for the WHERE clause, ON clause, etc after the optimization phase.
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