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