On 18 July 2018 at 06:01, Alvaro Herrera <alvherre@2ndquadrant.com> wrote:
> On 2018-Jul-16, David Rowley wrote:
>
>> On 16 July 2018 at 12:55, David Rowley <david.rowley@2ndquadrant.com> wrote:
>> > Thinking about this some more, I don't quite see any reason that the
>> > partitioned_rels for a single hierarchy couldn't just be a Bitmapset
>> > instead of an IntList.
>>
>> Of course, this is not possible since we can't pass a List of
>> Bitmapsets to the executor due to Bitmapset not being a node type.
>
> Maybe we can just add a new node type that wraps a lone bitmapset. The
> naive implementation (just print out individual members) should be
> pretty straightforward; a more sophisticated one (print out the "words")
> may end up more compact or not depending on density, but much harder for
> debugging, and probably means a catversion bump when BITS_PER_BITMAPWORD
> is changed, so probably not a great idea anyway.
>
> I suppose the only reason we haven't done this yet is nobody has needed
> it. Sounds like its time has come.
I don't mind doing the work if that's what's wanted, but I'd rather
wait for Tom to provide a bit more input into this as he seems to have
some ideas that I don't understand well enough to write code for.
--
David Rowley http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
