Re: Changed SRF in targetlist handling

"David G. Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> writes:
> If the SRFs return a different number of rows the LCM behavior kicks in and
> you get Robert's second result.

Only if the periods of the SRFs are relatively prime. That is, neither of
his examples demonstrate the full weirdness of the current behavior; for
that, you need periods that are multiples of each other. For instance:

SELECT generate_series(1, 2), generate_series(1, 4);
generate_series | generate_series
-----------------+-----------------
1 | 1
2 | 2
1 | 3
2 | 4
(4 rows)

That doesn't comport with any behavior available from LATERAL.

regards, tom lane