Query fails when SRFs are part of FROM clause (Commit id: 69f4b9c85f)

Consider the below test;

CREATE TABLE tab ( a int primary key);

SELECT *
FROM pg_constraint pc,
CAST(CASE WHEN pc.contype IN ('f','u','p') THEN generate_series(1,
array_upper(pc.conkey, 1)) ELSE NULL END AS int) AS position;

Above query is failing with "set-valued function called in context that
cannot
accept a set". But if I remove the CASE from the query then it working just
good.

Like:

SELECT *
FROM pg_constraint pc,
CAST(generate_series(1, array_upper(pc.conkey, 1)) AS int) AS position;

This started failing with 69f4b9c85f168ae006929eec44fc44d569e846b9. It seems
check_srf_call_placement() sets the hasTargetSRFs flag and but when the SRFs
at the rtable ofcourse this flag doesn't get set. It seems like missing
something
their, but I might be completely wrong as not quire aware of this area.

regards,
Rushabh Lathia
www.EnterpriseDB.com