Re: [HACKERS] patch: function xmltable
| От | Pavel Stehule |
|---|---|
| Тема | Re: [HACKERS] patch: function xmltable |
| Дата | |
| Msg-id | CAFj8pRBUF2en2XyBcT+L5RVybQ_KPELnwFxEjPjc=CtPiKzqSw@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: [HACKERS] patch: function xmltable (Tom Lane <tgl@sss.pgh.pa.us>) |
| Список | pgsql-hackers |
2017-01-25 5:45 GMT+01:00 Tom Lane <tgl@sss.pgh.pa.us>:
Andres Freund <andres@anarazel.de> writes:
> On 2017-01-24 21:32:56 -0300, Alvaro Herrera wrote:
>> XMLTABLE is specified by the standard to return multiple rows ... but
>> then as far as my reading goes, it is only supposed to be supported in
>> the range table (FROM clause) not in the target list. I wonder if
>> this would end up better if we only tried to support it in RT. I asked
>> Pavel to implement it like that a few weeks ago, but ...
> Right - it makes sense in the FROM list - but then it should be an
> executor node, instead of some expression thingy.
+1 --- we're out of the business of having simple expressions that
return rowsets.
If we do decision so this kind of function will have different behave than other SRF functions, then I remove support for this.
There are not technical reasons (maybe I don't see it) - last Andres changes do well support for my code.
Regards
Pavel
regards, tom lane
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