Simon Riggs <simon@2ndQuadrant.com> writes:
> On Wed, Jun 15, 2011 at 8:05 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> Simon Riggs <simon@2ndQuadrant.com> writes:
>>> So a function that is both STRICT and SET RETURNING will return rows.
>> Really? The case behaves as expected for me.
> Seems that's the wrong question. Let me return to why I raised this:
> Why does evaluate_function() specifically avoid returning NULL for a
> set returning function?
Because replacing the SRF call with a constant NULL would produce the
wrong result, ie, a single row containing NULL, not zero rows.
regards, tom lane