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https://issues.apache.org/jira/browse/OPTIQ-400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14122211#comment-14122211
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Julian Hyde commented on OPTIQ-400:
-----------------------------------
{{JdbcTest.testCountStar}} seems to test for this exact case. I added it in
https://github.com/apache/incubator-optiq/commit/e60fa76e207f7a9d8c7bdaf0a5dea951f9b561a5
as part of the fix for OPTIQ-393 and it succeeds in every commit since then.
What case are you running into that isn't handled by this code?
> RelField Trimmer needs to handle cross Joins
> --------------------------------------------
>
> Key: OPTIQ-400
> URL: https://issues.apache.org/jira/browse/OPTIQ-400
> Project: Optiq
> Issue Type: Bug
> Reporter: Laljo John Pullokkaran
> Assignee: Laljo John Pullokkaran
> Attachments: optiq-400.patch
>
>
> select R1.key from R1 Join R2 would result in field trimmer asking for
> nothing from R2. This is obviously wrong:
> It should either add a constant or get any one field so that cardinality of
> join is maintained.
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