[jira] [Resolved] (CALCITE-5745) CONCAT2 function (enabled in Oracle library) gets wrong result when one of the arguments is NULL

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

     [ https://issues.apache.org/jira/browse/CALCITE-5745?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde resolved CALCITE-5745.
----------------------------------
    Resolution: Fixed

Fixed in [94fce144|https://github.com/apache/calcite/commit/94fce144b1864edffec532638496993835468675]; thanks for the PR, [~VAE]!

> CONCAT2 function (enabled in Oracle library) gets wrong result when one of the arguments is NULL
> ------------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-5745
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5745
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.34.0
>            Reporter: ZheHu
>            Assignee: ZheHu
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.35.0
>
>
> Tested CONCAT function in Oracle and got the corresponding results.
> {code}
> select concat('a', cast(null as varchar(20))) from DUAL;
> --- results in 'a'
> {code}
> {code}
> select concat('a', null) from DUAL;
> select 'a' ||  null from DUAL;
> --- both result in 'a'
> {code}
> In Calcite(see checkConcat2Func() in SqlOperatorTest.java), CONCAT2 function gets null when running:
> {code}
> concat('a', cast(null as varchar))
> {code}



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