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https://issues.apache.org/jira/browse/CALCITE-5745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17731270#comment-17731270
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Julian Hyde commented on CALCITE-5745:
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Postgres' CONCAT function should behave like Oracle CONCAT, and ignore null
arguments. Calcite's behavior (e.g. in {{SqlOperatorTest.testConcatFunc}} is
currently wrong. Let's fix as part of CALCITE-5741.
> 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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