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Tom Lane 3d351d916b Redefine pg_class.reltuples to be -1 before the first VACUUM or ANALYZE. ... Historically, we've considered the state with relpages and reltuples both zero as indicating that we do not know the table's tuple density. This is problematic because it's impossible to distinguish "never yet vacuumed" from "vacuumed and seen to be empty". In particular, a user cannot use VACUUM or ANALYZE to override the planner's normal heuristic that an empty table should not be believed to be empty because it is probably about to get populated. That heuristic is a good safety measure, so I don't care to abandon it, but there should be a way to override it if the table is indeed intended to stay empty. Hence, represent the initial state of ignorance by setting reltuples to -1 (relpages is still set to zero), and apply the minimum-ten-pages heuristic only when reltuples is still -1. If the table is empty, VACUUM or ANALYZE (but not CREATE INDEX) will override that to reltuples = relpages = 0, and then we'll plan on that basis. This requires a bunch of fiddly little changes, but we can get rid of some ugly kluges that were formerly needed to maintain the old definition. One notable point is that FDWs' GetForeignRelSize methods will see baserel->tuples = -1 when no ANALYZE has been done on the foreign table. That seems like a net improvement, since those methods were formerly also in the dark about what baserel->tuples = 0 really meant. Still, it is an API change. I bumped catversion because code predating this change would get confused by seeing reltuples = -1. Discussion: https://postgr.es/m/F02298E0-6EF4-49A1-BCB6-C484794D9ACC@thebuild.com		5 years ago
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data	pg_prewarm: Add automatic prewarm feature.	8 years ago
expected	…
input	file_fdw: Fix for generated columns	6 years ago
output	file_fdw: Fix for generated columns	6 years ago
sql	…
.gitignore	Support "make check" in contrib	14 years ago
Makefile	Add file version information to most installed Windows binaries.	11 years ago
file_fdw--1.0.sql	Throw a useful error message if an extension script file is fed to psql.	14 years ago
file_fdw.c	Redefine pg_class.reltuples to be -1 before the first VACUUM or ANALYZE.	5 years ago
file_fdw.control	…