"David G. Johnston" <david.g.johns...@gmail.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
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