Hi,
Thanks for working it! I'm interested in this feature, so I'd like to participate in the
patch review. Though I've just started looking at the patch, I have two comments
about the v6 patch. (And I want to confirm the thread active.)
1) Unify the print format of leader and worker
In show_tidbitmap_info(), the number of exact/loosy blocks of the leader and workers
are printed. I think the printed format should be same. Currently, the leader does not
print the blocks of exact/lossy with a value of 0, but the workers could even if it is 0.
IMHO, it's better to print both exact/lossy blocks if at least one of the numbers of
exact/lossy blocks is greater than 0. After all, the print logic is redundant for leader
and workers, but I thought it would be better to make it a common function.
2) Move es->workers_state check
In show_tidbitmap_info(), ExplainOpenWorker() and ExplainCloseWorker() are called
after checking es->worker_state is not NULL. However, es->workers_state seem to be
able to be NULL only for the Gather node (I see ExplainPrintPlan()). Also, reading the
comments, there is a description that each worker information needs to be hidden
when printing the plan.
Even if es->workers_state becomes NULL in BitmapHeapScan node in the future,
I think that workers' information(Heap Blocks) should not be printed. Therefore,
I think es->workers_state check should be move to the place of
"if (planstate->pstate != NULL)" like ExplainNode(), doesn't it?
IIUC, we need to correct show_sort_info() and so on too…
Regards,
--
Masahiro Ikeda
NTT DATA CORPORATION
