Re: Internal error XX000 with enable_partition_pruning=on, pg 11 beta1 on Debian

On 2018-Jul-16, David Rowley wrote:

> On 16 July 2018 at 12:55, David Rowley <david(dot)rowley(at)2ndquadrant(dot)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.

--
Álvaro Herrera https://www.2ndQuadrant.com/
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