Re: format() function with string_agg - Mailing list pgsql-admin

On Wednesday, September 24, 2014, Tom Lane <tgl@sss.pgh.pa.us> wrote:

Raj Gandhi <raj01gandhi@gmail.com> writes:
> SQL with VARIADIC also gives the same error in 9.1:
> select format('%s %s', VARIADIC array_agg(val))
> from (values ('1'),('2')) src (val)
> ==
> ERROR:  too few arguments for format

You need 9.3 or later for that to work.  Per the 9.3 release notes:

    * Allow concat() and format() to properly expand VARIADIC-labeled arguments (Pavel Stehule)

                        regards, tom lane

Found it.

 http://www.postgresql.org/docs/9.3/interactive/functions-string.html

In the comments after table 9.6

This whole feature could maybe be made more visible in the 9.3 documentation but (arguably) since it was a feature and not a bug fix back patching was not possible.  Specifically it seems like it was too invasive a change to make it work properly in the back branches.

David J.