SAP HANA supports STRING_AGG function. https://help.sap.com/viewer/4fe29514fd584807ac9f2a04f6754767/2.0.04/en-US/a924ee1e98ab435a874efa32e6f0ae14.html
Also SQL Server and Azure Synapse support STRING_AGG https://docs.microsoft.com/en-us/sql/t-sql/functions/string-agg-transact-sql
In Oracle there is LISTAGG. https://docs.oracle.com/cd/E11882_01/server.112/e41084/functions089.htm#SQLRF30030
This aggregate function is currently not available in Spotfire, see screenshot, but is very useful is lots of situations.
The Spotfire function Concatenate() should be mapped to this like it is available for In-Memory data.