[stable3.7] fix(db): Delete recipients without sub query #9813
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MySQL does not use indexes for the "dependent" subquery. It's either a bug or a missing optimization. EXPLAIN for the two queries is fine in isolation but when you DELETE with subquery neither the inner nor the outher query use an index. This causes a full table scan on very large tables. Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>
ChristophWurst
approved these changes
Jul 8, 2024
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Backport of PR #9761