Re: Strict Set Returning Functions
| От | Simon Riggs |
|---|---|
| Тема | Re: Strict Set Returning Functions |
| Дата | |
| Msg-id | BANLkTi=4ZJSHH4qA5-u3f7dHpCx_cCt2iA@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Strict Set Returning Functions (Tom Lane <tgl@sss.pgh.pa.us>) |
| Список | pgsql-hackers |
On Thu, Jun 16, 2011 at 12:24 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote: > 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. OK, thanks. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services
В списке pgsql-hackers по дате отправления: