[jira] [Created] (CALCITE-5741) Add support for MSSQL CONCAT_WS function

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

ZheHu created CALCITE-5741:
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             Summary: 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


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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