Re: Backend crash with user defined aggregate

Ron Mayer <rm_pg@cheapcomplexdevices.com> writes:
> I tried making an aggregate function that concatenates
> any non-null strings it encounters, as shown below.
> The function works fine on small tables; but when I run
> it on one of my larger tables it seems to me that it
> crashes the backend - though I don't see anything obvious
> in the log.

I tried this example in CVS tip and didn't see any particular misbehavior.
What PG version are you running?  Does EXPLAIN show that the query is
being done with a group or hash aggregation?  What do you have sort_mem
set to?

            regards, tom lane