Horton

Re: patch: function xmltable

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>, Pavel Stehule <pavel.stehule@gmail.com>, Craig Ringer <craig@2ndquadrant.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2017-01-25T04:45:03Z
Lists: pgsql-hackers 
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.

			regards, tom lane

Commits

  1. Support XMLTABLE query expression

  2. Create <sect3> in the functions-xml section

  3. Improve handling of "UPDATE ... SET (column_list) = row_constructor".

  4. Add xmlexists function