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Posted to issues@calcite.apache.org by "Julian Hyde (JIRA)" <ji...@apache.org> on 2014/08/29 21:55:54 UTC

[jira] [Created] (OPTIQ-393) If no fields are projected from a table, field trimmer should project a dummy expression

Julian Hyde created OPTIQ-393:
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             Summary: If no fields are projected from a table, field trimmer should project a dummy expression
                 Key: OPTIQ-393
                 URL: https://issues.apache.org/jira/browse/OPTIQ-393
             Project: Optiq
          Issue Type: Bug
            Reporter: Julian Hyde
            Assignee: Julian Hyde


If no fields are projected from a table, field trimmer should project a dummy expression. Projecting no expressions is wrong, because it confuses other parts of the system; projecting all fields is wrong, because we would get data volume stats wrong and lose the opportunity to read less data from disk.



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