From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Andrew Bartley <ambartley(at)gmail(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: intagg |
Date: | 2013-06-20 19:40:43 |
Message-ID: | 25041.1371757243@sss.pgh.pa.us |
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Lists: | pgsql-general |
Andrew Bartley <ambartley(at)gmail(dot)com> writes:
> function int_array_aggregate(integer[]) does not exist
int_array_aggregate() takes integers, not arrays of integers.
Depending on exactly what semantics you'd like to have, you could
probably build a custom aggregate to do this without any new C code
--- try basing it on array_cat() for instance.
regression=# create aggregate myagg (anyarray) (
sfunc = array_cat,
stype = anyarray,
initcond = '{}');
CREATE AGGREGATE
regression=# select * from x;
transactions
--------------
{1,2}
{3,4,5}
(2 rows)
regression=# select myagg(transactions) from x;
myagg
-------------
{1,2,3,4,5}
(1 row)
regards, tom lane
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