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Posted to issues@calcite.apache.org by "Julian Hyde (JIRA)" <ji...@apache.org> on 2014/09/06 02:10:28 UTC

[jira] [Resolved] (OPTIQ-404) MergeProjectRule should not construct RexPrograms for simple mappings

     [ https://issues.apache.org/jira/browse/OPTIQ-404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde resolved OPTIQ-404.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 0.9.1-incubating

Fixed in http://git-wip-us.apache.org/repos/asf/incubator-optiq/commit/6fbefcec.

> MergeProjectRule should not construct RexPrograms for simple mappings
> ---------------------------------------------------------------------
>
>                 Key: OPTIQ-404
>                 URL: https://issues.apache.org/jira/browse/OPTIQ-404
>             Project: Optiq
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>             Fix For: 0.9.1-incubating
>
>
> MergeProjectRule should not construct RexPrograms when it is dealing with projections that are simple mappings or permutations. It can combine the mappings using less computation and memory.
> Further, if either of the projects is the identity, MergeProjectRule should do nothing; it should let RemoveTrivialProjectRule deal with it.
> This should reduce the amount of memory required for complex planning, in particular when there are large joins and many calls to SwapJoinRule.  OPTIQ-62 is a better but more complex solution to the same issue.



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