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https://issues.apache.org/jira/browse/CALCITE-5741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17731299#comment-17731299
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ZheHu commented on CALCITE-5741:
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I've submitted a patch for CALCITE-5771, maybe we can catch 1.35.0.
> Add support for MSSQL CONCAT_WS function
> ----------------------------------------
>
> Key: CALCITE-5741
> URL: https://issues.apache.org/jira/browse/CALCITE-5741
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.34.0
> Reporter: ZheHu
> Assignee: ZheHu
> Priority: Minor
>
> CONCAT_WS function in MSSQL has the following syntax:
> {code:java}
> CONCAT_WS ( separator, argument1, argument2 [, argumentN]... )
> {code}
> This function returns a string resulting from the concatenation, or joining,
> of two or more string values in an end-to-end manner. It separates those
> concatenated string values with the delimiter specified in the first function
> argument. Moreover, the amount of arguments varies from 3 to 254.
> Unlike CONCAT function, CONCAT_WS ignores NULL value, for example:
> {code:java}
> select concat_ws(',', 'a', 'b', null, null, 'c');
> -- result in 'a,b,c'
> {code}
> For more details, see
> [doc|https://learn.microsoft.com/en-us/sql/t-sql/functions/concat-ws-transact-sql?view=sql-server-ver16].
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