Re: Playing with 9.4devel - unnest

Hmm. So it is.
My bad, thanks Tom.

I hadn’t noticed the documentation where it clearly says "This is only
allowed in the FROM clause”

xml_test=# select unnest(*) from (select array[1,2],array[1,2,3]) foo;
ERROR: function unnest() does not exist

And, yes.. I was expecting the function signature to change. Thanks for
setting me straight.

Tim

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Date: Monday, 10 March 2014 15:10
To: Tim Kane <tim(dot)kane(at)gmail(dot)com>
Cc: pgsql-general General <pgsql-general(at)postgresql(dot)org>
Subject: Re: [GENERAL] Playing with 9.4devel - unnest

Tim Kane <tim(dot)kane(at)gmail(dot)com> writes:
> I decided to have a play with postgresql-9.4devel as I wanted to explore the
> functionality provided by
> unnest (anyarray, anyarray [, ╜])
> Iâ•˙ve taken the nightly snpahost, compiled, installed.. All good. (Obtained
> from http://ftp.postgresql.org/pub/snapshot/dev/ )
> However it seems the expected multi-argument unnest function doesnâ•˙t exist.

> Have I missed something?

It's there:

regression=# select * from unnest(array[1,2], array[3,4]);
unnest | unnest
--------+--------
1 | 3
2 | 4
(2 rows)

If you were expecting this to change, it didn't:

regression=# \df unnest
List of functions
Schema | Name | Result data type | Argument data types | Type
------------+--------+------------------+---------------------+--------
pg_catalog | unnest | SETOF anyelement | anyarray | normal
(1 row)

because the new functionality arises from a parser transformation,
not from a simple function.

regards, tom lane