Hi, I'm working on adding information about prefetching for scans [1], which includes BitmapHeapScan. I realized the instrumentation added by this thread may not be quite right, resulting in missing instrumentation for non-parallel-aware scans in a parallel query.
A better description / explanation of the issue is posted here [2]. I've posted a proposed fix in the following message [3], in a patch: v8-0002-Show-Bitmap-Heap-Scan-stats-for-non-parallel-awar.patch I wonder if someone from this thread could review my analysis, and confirm this is not intentional. I don't see it discussed in the thread, so I assume no one noticed this behavior. I'd also appreciate a review of the proposed fix, or suggestions for alternative fixes. regards [1] https://www.postgresql.org/message-id/a177a6dd-240b-455a-8f25-aca0b1c08c6e%40vondra.me [2] https://www.postgresql.org/message-id/3bdbc70d-ad44-494a-8aab-868b5066fe8b%40vondra.me [3] https://www.postgresql.org/message-id/fce326bb-1210-4d48-8c97-bb3bca396eba%40vondra.me -- Tomas Vondra
