[jira] [Resolved] (CALCITE-727) Constant folding involving CASE and NULL

["Julian Hyde (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-727?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde resolved CALCITE-727.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 1.4.0-incubating

Fixed in http://git-wip-us.apache.org/repos/asf/incubator-calcite/commit/21cf1259.

[~ashutoshc], FYI.

> Constant folding involving CASE and NULL
> ----------------------------------------
>
>                 Key: CALCITE-727
>                 URL: https://issues.apache.org/jira/browse/CALCITE-727
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>             Fix For: 1.4.0-incubating
>
>
> There are a few Hive issues relating to constant reduction of NULL and CASE. Calcite should do the same.
> HIVE-9645:
> {code}
> select count(1) from store_sales where null=1;
> # should simplify to
> select count(1) from store_sales where false;
> {code}
> HIVE-9644:
> {code}
> select count(1) from store_sales where (case ss_sold_date when '1998-01-01' then 1 else null end)=1;
> # should simplify to
> select count(1) from store_sales where ss_sold_date= '1998-01-01' ;
> {code}



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