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  1. MariaDB Server
  2. MDEV-5337

Wrong result in mariadb 5.5.32 with ORDER BY + LIMIT when index_condition_pushdown=on

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    Description

      The query following:

      select aid,bid from tbl where bid in (...) and cid = ? order by aid limit 20000,20

      when the set (...) is large and the limit offset is big enough like 20000, then it will return wrong result that here the value of column bid is not in the where condition. And if I turn off the index_condition_pushdown, it will return correct result.

      Note: I tested it in mariadb 5.5.33a, 5.5.34, 5.5.32 and 10.0.6, all these version have the issue. Also, the issue only occurs in innodb/xtradb. Myisam does not have this issue.

      How to repeat:

      Test case:
      I put all the test cases and data source file in the attachement.
      There are two test cases: test-innodb-9090.sql, test-myisam-9090.sql.
      The 9090 means that the "where in (...)" contains 9090 items.

      The test case do the following:
      create table and load data.
      run the query
      explain the query
      turn off the index_condition_pushdown
      run the query again
      explain the query again

      run the two test cases:
      mysql test < test-innodb-9090.sql > r/result-innodb-9090
      mysql test < test-myisam-9090.sql > r/result-myisam-9090

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            Thanks for reporting and for the test case.
            Reproducible as described.

            elenst Elena Stepanova added a comment - Thanks for reporting and for the test case. Reproducible as described.

            Debugged, this is the same issue as MDEV-5512. The testcase passed after the fix.

            psergei Sergei Petrunia added a comment - Debugged, this is the same issue as MDEV-5512 . The testcase passed after the fix.

            Thanks for the bug report, and for the detailed testcase. The fix is pushed into 5.3 and 5.5 trees, and will be available in the next releases.

            psergei Sergei Petrunia added a comment - Thanks for the bug report, and for the detailed testcase. The fix is pushed into 5.3 and 5.5 trees, and will be available in the next releases.

            One fix for this issue and MDEV-5512

            psergei Sergei Petrunia added a comment - One fix for this issue and MDEV-5512

            Re-opening just to change Resolution from 'Duplicate' to the more appropriate 'Fixed'

            elenst Elena Stepanova added a comment - Re-opening just to change Resolution from 'Duplicate' to the more appropriate 'Fixed'
            dbart Daniel Bartholomew added a comment - http://bazaar.launchpad.net/~maria-captains/maria/5.5/revision/2502.567.187
            dbart Daniel Bartholomew added a comment - http://bazaar.launchpad.net/~maria-captains/maria/5.5/revision/4026.1.1

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              psergei Sergei Petrunia
              zvictorino Zhixin Zhang
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              Dates

                Created:
                Updated:
                Resolved:

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