PG Bug reporting form <noreply@postgresql.org> writes:
> The following script:
> CREATE TABLE t (a int);
> INSERT INTO t VALUES(1), (2);
> CREATE VIEW v AS SELECT a FROM t WHERE EXISTS (SELECT 1 FROM t);
> MERGE INTO v USING (SELECT * FROM generate_series(1,1)) AS s(a)
> ON s.a = v.a WHEN NOT MATCHED BY SOURCE THEN DELETE;
> produces:
> ERROR: XX000: wrong varnullingrels (b) (expected (b 4)) for Var 5/1
> LOCATION: search_indexed_tlist_for_var, setrefs.c:2847
I haven't run this fully to ground, but what it looks like
is that preprocess_targetlist is generating row identity
Vars that lack required varnullingrels. I don't understand
though why this only seems to affect MERGE.
regards, tom lane
