-584 INVALID USE OF NULL

Explanation

The NULL keyword is not valid as specified. One of the following error
situations occurred:

The NULL keyword was used in the USING source-table clause of the MERGE
statement, but the NULL keyword was not explicitly cast to a supported data type.

System action
The statement cannot be processed.

User response

Take the following action:

Specify the NULL keyword within a CAST expression when using NULL within the USING VALUES clause
of the MERGE statement.

SQLSTATE
42608