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| author | Igor Babaev <igor@askmonty.org> | 2012-11-01 14:54:33 -0700 |
|---|---|---|
| committer | Igor Babaev <igor@askmonty.org> | 2012-11-01 14:54:33 -0700 |
| commit | 7714739b2d6a50c4ca69421c0e19a9e08ff3b5c7 (patch) | |
| tree | ad8a87f9312075ed3f90255f9d7916055cd56d28 /storage/xtradb/include/os0sync.h | |
| parent | 9b6fe965033aab5eb20a4f2eefa482534b15c424 (diff) | |
| download | mariadb-git-7714739b2d6a50c4ca69421c0e19a9e08ff3b5c7.tar.gz | |
Fixed bug mdev-585 (LP bug #637962)
If, when executing a query with ORDER BY col LIMIT n, the optimizer chose
an index-merge scan to access the table containing col while there existed
an index defined over col then optimizer did not consider the possibility
of using an alternative range scan by this index to avoid filesort. This
could cause a performance degradation if the optimizer flag index_merge was
set up to 'on'.
Diffstat (limited to 'storage/xtradb/include/os0sync.h')
0 files changed, 0 insertions, 0 deletions