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 ------ master Details ------- https://git.postgresql.org/pg/commitdiff/0960ae1967d0569be4d118c20e51a2ed98d76f65 Modified Files -------------- src/backend/executor/nodeBitmapHeapscan.c | 10 +++++----- src/test/regress/expected/partition_prune.out | 4 +++- 2 files changed, 8 insertions(+), 6 deletions(-)