LP:603186 - RQG: Virtual persistent columns not computed properly for default NULL values

In the example below, the virtual persistent column does not agree that the result from INTERVAL ( NULL , NULL ) is -1 . If the computation is executed without the aid of a virtual column, or if the virtual column is not persisted, the result is correct.

CREATE TABLE t1 ( f1 CHAR(32), f2 CHAR(32), v1 INT AS ( INTERVAL( f2 , NULL ) ) PERSISTENT );
INSERT INTO t1 ( f1 ) VALUES ( NULL );

SELECT INTERVAL(NULL , NULL), v1, ( INTERVAL( f2, NULL ) ) FROM t1;