Re: Parallel Bitmap Heap Scan reports per-worker stats in EXPLAIN ANALYZE

Hi,

On 1/20/23 09:34, David Geier wrote:
> EXPLAIN ANALYZE for parallel Bitmap Heap Scans currently only reports
> the number of heap blocks processed by the leader. It's missing the
> per-worker stats. The attached patch adds that functionality in the
> spirit of e.g. Sort or Memoize. Here is a simple test case and the
> EXPLAIN ANALYZE output with and without the patch:

Attached is a rebased version of the patch. I would appreciate someone
taking a look.

As background: the change doesn't come out of thin air. We repeatedly
took wrong conclusions in our query analysis because we assumed that the
reported block counts include the workers.

If no one objects I would also register the patch at the commit fest.
The patch is passing cleanly on CI.

--
David Geier
(ServiceNow)