Querying SQL Server variant type for a string fails

Table on SQL Server source created as

CREATE TABLE table_with_variant(id INT, var SQL_VARIANT)

and loaded with int, float and string data.

Running the following query against a dynamic VDB with metadata import

SELECT cast(var AS string) FROM table_with_variant WHERE id = 1

fails with

java.sql.SQLException: Remote com.microsoft.sqlserver.jdbc.SQLServerException: The "variant" data type is not supported.

This query used to work with DV 6.4.2, it appears it is a further regression from TEIID-5313 . Querying rows with non-string data works as expected.

SOURCE SRC command with 6.4.2 (working):

SELECT cast(g_0."var" AS varchar(4000)) FROM "dballo05"."dbo"."table_with_variant" g_0 WHERE g_0."id" = 1

SOURCE SRC command with 6.4.3 (not working), note missing cast to varchar:

SELECT g_0."var" FROM "dballo06"."dbo"."table_with_variant" g_0 WHERE g_0."id" = 1