Re: partition tree inspection functions

Hi,

On 08/03/2018 08:59 AM, Robert Haas wrote:
> On Fri, Aug 3, 2018 at 8:35 AM, Jesper Pedersen
> <jesper.pedersen@redhat.com> wrote:
>> If you are given a leaf partition as input, then you will have to keep
>> executing the query until you find the root, and count those. So, I think it
>> should be either be the level to the root, or there should be another column
>> that lists that (rootlevel).
> 
> I disagree.  I think Amit has got the right semantics -- it gives you
> everything rooted at the partition you name, relative to that root.
> We could have another function which, given the OID of a partition,
> returns the topmost parent (or the immediate parent), but I think that
> if you say "tell me all the partitions of X", it should just tell you
> about stuff that's under X, regardless of what's over X.
> 

We had the 2 pg_partition_level() functions and 
pg_partition_leaf_children() in v8, so it would be good to get those back.

Best regards,
  Jesper