Consider the following:
CREATE TEMP TABLE tbl (
id SERIAL NOT NULL,
PRIMARY KEY (id)
);
COPY tbl (id) FROM stdin;
1
2
3
4
\.
SELECT substring ('1234567890' FOR (SELECT count (*) FROM tbl)::int);
This returns '1234', as expected. But
SELECT substring ('1234567890' FOR (SELECT count (*) FROM tbl));
returns NULL. I think the problem is that "SELECT count(*)" returns a
BIGINT whereas "substring" expects an INT. Shouldn't there be a warning?
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