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We're hitting the problem in MDEV-9504 (
https://jira.mariadb.org/browse/MDEV-9504).  I see from the commit at
that this change was backed out due to test failures.  I ran through all
the mysql-tests with and without the change and haven't been able to
pinpoint a difference though.

The reverting commit indicates the correct value for select_limit is only
computed when the query plan changes.  Any chance someone could provide
more detail on what needs to be changed to avoid regression with this fix?
If there are sample queries that regress with only the original MDEV-9504
changes, that would be helpful.

Thanks in advance!