[jira] [Closed] (CALCITE-4133) Shouldn't trim fields when it's under Union

["Andrei Sereda (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-4133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrei Sereda closed CALCITE-4133.
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> Shouldn't trim fields when it's under Union
> -------------------------------------------
>
>                 Key: CALCITE-4133
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4133
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Jiatao Tao
>            Assignee: Jiatao Tao
>            Priority: Major
>             Fix For: 1.25.0
>
>
> Consider case like this:
>  
> {code:java}
> String sql =
>     "select \n"
>     + "   gender, \n"
>     + "   count(*) \n"
>     + "from \n"
>     + "(\n"
>     + "  (select gender, empno from EMPS) \n"
>     + "  union \n"
>     + "  (select gender, empno from EMPS)\n"
>     + ") group by gender";
> {code}
> And the plan is:
>  
> {code:java}
> EnumerableAggregate(group=[{0}], EXPR$1=[COUNT()])
>   EnumerableUnion(all=[false])
>     EnumerableProject(GENDER=[$3])
>       EnumerableTableScan(table=[[SALES, EMPS]])
>     EnumerableProject(GENDER=[$3])
>       EnumerableTableScan(table=[[SALES, EMPS]])
> {code}
>  
> The col empno has been trimmed, this changes the semantics cuz union will distinct values.
>  
>  



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