From 5ae245664830219bab2e2ada11d2379875f4501a Mon Sep 17 00:00:00 2001 From: Heikki Linnakangas Date: Sat, 30 Sep 2023 17:03:50 +0300 Subject: [PATCH] Fix briefly showing old progress stats for ANALYZE on inherited tables. ANALYZE on a table with inheritance children analyzes all the child tables in a loop. When stepping to next child table, it updated the child rel ID value in the command progress stats, but did not reset the 'sample_blks_total' and 'sample_blks_scanned' counters. acquire_sample_rows() updates 'sample_blks_total' as soon as the scan starts and 'sample_blks_scanned' after processing the first block, but until then, pg_stat_progress_analyze would display a bogus combination of the new child table relid with old counter values from the previously processed child table. Fix by resetting 'sample_blks_total' and 'sample_blks_scanned' to zero at the same time that 'current_child_table_relid' is updated. Backpatch to v13, where pg_stat_progress_analyze view was introduced. Reported-by: Justin Pryzby Discussion: https://www.postgresql.org/message-id/20230122162345.GP13860%40telsasoft.com --- src/backend/commands/analyze.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c index 9c160c1ff5..01efdd5b04 100644 --- a/src/backend/commands/analyze.c +++ b/src/backend/commands/analyze.c @@ -1534,8 +1534,25 @@ acquire_inherited_sample_rows(Relation onerel, int elevel, AcquireSampleRowsFunc acquirefunc = acquirefuncs[i]; double childblocks = relblocks[i]; - pgstat_progress_update_param(PROGRESS_ANALYZE_CURRENT_CHILD_TABLE_RELID, - RelationGetRelid(childrel)); + /* + * Report progress. The sampling function will normally report blocks + * done/total, but we need to reset them to 0 here, so that they don't + * show an old value until that. + */ + { + const int progress_index[] = { + PROGRESS_ANALYZE_CURRENT_CHILD_TABLE_RELID, + PROGRESS_ANALYZE_BLOCKS_DONE, + PROGRESS_ANALYZE_BLOCKS_TOTAL + }; + const int64 progress_vals[] = { + RelationGetRelid(childrel), + 0, + 0, + }; + + pgstat_progress_update_multi_param(3, progress_index, progress_vals); + } if (childblocks > 0) {