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https://issues.apache.org/jira/browse/LENS-603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14585837#comment-14585837
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Sushil Mohanty commented on LENS-603:
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rb entry : https://reviews.apache.org/r/35458/
> Skip expression rewrite 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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