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Posted to issues@calcite.apache.org by "Julian Hyde (JIRA)" <ji...@apache.org> on 2015/06/17 23:38:01 UTC

[jira] [Commented] (CALCITE-760) Aggregate recommender blows up if row count estimate is too high

    [ https://issues.apache.org/jira/browse/CALCITE-760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14590658#comment-14590658 ] 

Julian Hyde commented on CALCITE-760:
-------------------------------------

Test case and workaround added in http://git-wip-us.apache.org/repos/asf/incubator-calcite/commit/e7d15add but issue is not fixed yet.

> Aggregate recommender blows up if row count estimate is too high
> ----------------------------------------------------------------
>
>                 Key: CALCITE-760
>                 URL: https://issues.apache.org/jira/browse/CALCITE-760
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>
> If you run the aggregate recommendation algorithm with a value of rowCountEstimate that is wrong and large, the algorithm runs for a long time and eventually fails with "OutOfMemoryError: GC overhead limit exceeded".
> I have added LatticeTest.testLatticeWithBadRowCountEstimate as a test case.



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