Thread: pgsql: Fix EXPLAIN Bitmap heap scan to count pages with no visible tupl
pgsql: Fix EXPLAIN Bitmap heap scan to count pages with no visible tupl
From
Heikki Linnakangas
Date:
Fix EXPLAIN Bitmap heap scan to count pages with no visible tuples Previously, bitmap heap scans only counted lossy and exact pages for explain when there was at least one visible tuple on the page. heapam_scan_bitmap_next_block() returned true only if there was a "valid" page with tuples to be processed. However, the lossy and exact page counters in EXPLAIN should count the number of pages represented in a lossy or non-lossy way in the constructed bitmap, regardless of whether or not the pages ultimately contained visible tuples. Backpatch to all supported versions. Author: Melanie Plageman Discussion: https://www.postgresql.org/message-id/CAAKRu_ZwCwWFeL_H3ia26bP2e7HiKLWt0ZmGXPVwPO6uXq0vaA@mail.gmail.com Discussion: https://www.postgresql.org/message-id/CAAKRu_bxrXeZ2rCnY8LyeC2Ls88KpjWrQ%2BopUrXDRXdcfwFZGA@mail.gmail.com Branch ------ REL_12_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/f3e4581acdc83258ff75a4c03950ff89762c98e6 Modified Files -------------- src/backend/executor/nodeBitmapHeapscan.c | 10 +++++----- src/test/regress/expected/partition_prune.out | 5 ++++- 2 files changed, 9 insertions(+), 6 deletions(-)