Igor Babaev bef20b5f36 MDEV-30538 Plans for SELECT and multi-table UPDATE/DELETE unexpectedly differ ...

This patch allowed transformation of EXISTS subqueries into equivalent
IN predicands at the top level of WHERE conditions for multi-table UPDATE
and DELETE statements. There was no reason to prohibit the transformation
for such statements. The transformation provides more opportunities of
using semi-join optimizations.

Approved by Oleksandr Byelkin <sanja@mariadb.com>

2023-02-03 11:17:03 -08:00

28 KiB

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