On 16 July 2018 at 06:55, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Also, in the Plan
> representation, I'd suggest avoiding situations where a data structure
> is sometimes a List of Lists of PartitionedRelPruneInfo and sometimes
> just a single-level List. Saving one ListCell isn't worth the code
> complexity and error-proneness of that.
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.
A parent partition is always going to have a lower relid than its
children, so that means that the top level parent will just have the
lowest member in the set.
There's already code in the inheritance_planner which rebuilds the
IntList from a Bitmapset:
while ((i = bms_next_member(partitioned_relids, i)) >= 0)
partitioned_rels = lappend_int(partitioned_rels, i);
ExecLockNonLeafAppendTables could be made to accept a Bitmapset rather
than a List. In fact, we could probably get rid of the nested loops if
we did it that way.
What do you think?
--
David Rowley http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
