Jeff Janes writes:
> On Fri, Jun 9, 2017 at 9:06 AM, Tom Lane wrote:
>> The issue is how to initialize the state value to begin with.
> Why does it need to be initialized? initializing a NULL state upon first
> use is already the job of sfunc.
Right, but for partial aggregation the combinefunc
On Fri, Jun 9, 2017 at 9:06 AM, Tom Lane wrote:
> Jeff Janes writes:
> > The docs for creating aggregates for 9.6 and beyond say:
> > "For aggregate functions whose state_data_type is internal, the
> combinefunc
> > must not be strict. In this case the combinefunc must ensure that null
> > state
Jeff Janes writes:
> The docs for creating aggregates for 9.6 and beyond say:
> "For aggregate functions whose state_data_type is internal, the combinefunc
> must not be strict. In this case the combinefunc must ensure that null
> states are handled correctly and that the state being returned is p
