MERGE statement using joined table reference causes internal server error

Some MERGE statements cause an internal server error. This happens, if the statement contains a JOIN between USING and ON which is not part of a subquery.

Example

MERGE INTO t1
USING (t2 JOIN t3 ON t2.c = t3.c) ON t1.c = t2.c
WHEN NOT MATCHED THEN INSERT VALUES (1)

Rewrite the statement by replacing the joined table reference behind "USING" with a subselect:

MERGE INTO t1
USING (SELECT t2.c FROM t2 JOIN t3 ON t2.c = t3.c) AS sub ON t1.c = sub.c
WHEN NOT MATCHED THEN INSERT VALUES (1)