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Posted to dev@lens.apache.org by "Sushil Mohanty (JIRA)" <ji...@apache.org> on 2015/06/12 08:00:12 UTC

[jira] [Created] (LENS-603) Skip expression in columnar rewriter

Sushil Mohanty created LENS-603:
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             Summary: Skip expression in columnar rewriter
                 Key: LENS-603
                 URL: https://issues.apache.org/jira/browse/LENS-603
             Project: Apache Lens
          Issue Type: Bug
            Reporter: Sushil Mohanty
            Assignee: Sushil Mohanty


There are certain cases where expressions has conditions which needs to be applied for  each resultant row. For eg. sum(case when city_dim.city_name = 'abc' then total_count when city_dim.city_name is null then 0 end) .  Columnar rewriter is rewriting such expression as fact subquery and passing the result to main query. We should skip such rewrite and do it only once in the main query. 



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