Merge lp:~laurynas-biveinis/percona-server/bug1394967 into lp:percona-server/5.6

Proposed by Laurynas Biveinis on 2014-11-22
Status: Merged
Approved by: Sergei Glushchenko on 2014-12-09
Approved revision: no longer in the source branch.
Merged at revision: 707
Proposed branch: lp:~laurynas-biveinis/percona-server/bug1394967
Merge into: lp:percona-server/5.6
To merge this branch: bzr merge lp:~laurynas-biveinis/percona-server/bug1394967
Reviewer Review Type Date Requested Status
Sergei Glushchenko g2 2014-11-22 Approve on 2014-12-09
Review via email: mp+242557@code.launchpad.net

Description of the change

Fix bug 1394967 / https://tokutek.atlassian.net/browse/DB-751 /
http://bugs.mysql.com/bug.php?id=57430 (query optimizer does not pick
covering index for some "order by" queries).

Apply the fix by Zardosht Kasheff that changes
test_if_cheaper_ordering to pick the covering index over non-covering
one if the row estimate is equal for both. Add a testcase.

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