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Fixed some possible race conditions when doing many reopen/close on the same
tables under heavy load! This can happen if you execute
mysqladmin
refresh often. This could in some very rare cases corrupt the header of the
index file and cause error 126 or 138.
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Fixed fatal bug in
refresh() when running with the --skip-locking
option.
There was a ``very small'' time gap after a mysqladmin refresh when
a table could be corrupted if one thread updated a table while another
thread did mysqladmin refresh and another thread started a new update
ont the same table before the first thread had finished.
A refresh (or --flush-tables) will now not return until all used tables
are closed!
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SELECT DISTINCT with a WHERE clause that didn't match any rows
returned a row in some contexts (bug only in 3.21.31).
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GROUP BY + ORDER BY returned one empty row when no rows where
found.
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Fixed a bug in the range optimizer that wrote
Use_count: Wrong count for ... in the error log file.
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