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Posted to issues@calcite.apache.org by "pengzhiwei (JIRA)" <ji...@apache.org> on 2018/10/13 04:09:00 UTC

[jira] [Comment Edited] (CALCITE-2620) Simplify "coalesce(null,x)" to "x"

    [ https://issues.apache.org/jira/browse/CALCITE-2620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16648733#comment-16648733 ] 

pengzhiwei edited comment on CALCITE-2620 at 10/13/18 4:09 AM:
---------------------------------------------------------------

[~julianhyde],In  -CALCITE-2506- this issue has not fixed. I fix it in the [PR882|https://github.com/apache/calcite/pull/882]


was (Author: pzw2018):
[~julianhyde],In  -CALCITE-2506- this issue has not fixed. I fix it in the [PR882|[http://example.com|https://github.com/apache/calcite/pull/882]]

> Simplify "coalesce(null,x)" to "x"
> ----------------------------------
>
>                 Key: CALCITE-2620
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2620
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.18.0
>            Reporter: pengzhiwei
>            Assignee: Julian Hyde
>            Priority: Major
>
> "coalesce(x0,x1,.....)" can be simplified if any of "xi" is null literal.
> e.g.  "coalesce(null,x)" can simplify to "x", "coalesce(x,null,y)" can simplify to "coalesce(x,y)"



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