[HACKERS] 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.