For following vdb:

<vdb name="a" version="1">
    <model name="vm1" type="VIRTUAL">
        <metadata type="DDL"><![CDATA[
            CREATE GLOBAL TEMPORARY TABLE teiidtemp(val integer) OPTIONS (UPDATABLE 'TRUE');

            CREATE VIRTUAL FUNCTION f1() RETURNS string AS
            BEGIN
                INSERT INTO teiidtemp(val) VALUES (1);
                DECLARE string v1 = SELECT 'default'||COUNT(val) FROM teiidtemp;
                RETURN v1;
            END;
	    CREATE VIRTUAL PROCEDURE p1() RETURNS (v1 string) AS
            BEGIN
                INSERT INTO teiidtemp(val) VALUES (1);
                SELECT 'default'||COUNT(val) FROM teiidtemp;
            END;
		]]>
        </metadata>
     </model>
</vdb>

The following errors occur when invoking procedure or function:

1. SELECT f1()

   • 15:49:17,608 WARN [org.teiid.PROCESSOR] (Worker1_QueryProcessorQueue14) TEIID30020 Processing exception for request 3rGTFUcDmmRP.0 'TEIID30328 Unable to evaluate f1(): TEIID30167 java.lang.NullPointerException'. Originally ExpressionEvaluationException TempTableDataManager.java:227. Enable more detailed logging to see the entire stacktrace.

2. SELECT a.v1 FROM (CALL p1()) a

   • 15:49:59,581 WARN [org.teiid.PROCESSOR] (Worker1_QueryProcessorQueue15) TEIID30020 Processing exception for request 3rGTFUcDmmRP.1 'TEIID30167 java.lang.NullPointerException'. Originally ProcedureErrorInstructionException TempTableDataManager.java:227. Enable more detailed logging to see the entire stacktrace.