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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