2010/9/1 Tom Lane <tgl@sss.pgh.pa.us>:
> "David E. Wheeler" <david@kineticode.com> writes:
>> On Sep 1, 2010, at 11:09 AM, Pavel Stehule wrote:
>>> Then you can eliminate NULLs with simple function
>
>> Kind of defeats the purpose of the efficiency of the aggregate.
>
> Well, you can build your own version of array_agg with the same
> implementation, except you mark the transition function as strict ...
>
I am checking this now, and it is not possible - it needs a some
initial value and there isn't possible to set a "internal" value.
probably some C coding is necessary.
Regards
Pavel
> regards, tom lane
>