Horton

Fix initialization of pg_stat_get_lastscan()

Michael Paquier <michael@paquier.xyz>

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Commit: d7744d50a5394db8d973d1cfa034ed6640aec13c
Author: Michael Paquier <michael@paquier.xyz>
Date: 2022-11-08T01:50:09Z
Releases: 16.0 
Fix initialization of pg_stat_get_lastscan()

A NULL result should be reported when a stats timestamp is set to 0, but
c037471 missed that, leading to a confusing timestamp value after for
example a DML on a freshly-created relation with no scans done on it
yet.

This impacted the following attributes for two system views:
- pg_stat_all_tables.last_idx_scan
- pg_stat_all_tables.last_seq_scan
- pg_stat_all_indexes.last_idx_scan

Reported-by: Robert Treat
Analyzed-by: Peter Eisentraut
Author: Dave Page
Discussion: https://postgr.es/m/CABV9wwPzMfSaz3EfKXXDxKmMprbxwF5r6WPuxqA=5mzRUqfTGg@mail.gmail.com

Files

PathChange+/−
src/backend/utils/adt/pgstatfuncs.c modified +7 −1
src/test/regress/expected/stats.out modified +6 −0
src/test/regress/sql/stats.sql modified +1 −0

Discussion