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mirror of https://github.com/MariaDB/server.git synced 2025-05-28 13:01:41 +03:00
Igor Babaev bd305d6b21 Fixed bug mdev-4220.
This bug is a regression bug. The regression was introduced by
the patch for mdev-3851, that tried to weaken the condition when
a ref access with an extended key can be converted to an eq_ref
access. The patch incorrectly formed this condition. As a result,
while improving performance for some queries, the patch caused 
worse performance for another queries.
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