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Redefine pg_class.reltuples to be -1 before the first VACUUM or ANALYZE.

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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
This commit is contained in:
Tom Lane
2020-08-30 12:21:51 -04:00
parent 9511fb37ac
commit 3d351d916b
20 changed files with 77 additions and 69 deletions
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7
contrib/postgres_fdw/postgres_fdw.c
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@ -692,15 +692,14 @@ postgresGetForeignRelSize(PlannerInfo *root,
else
{
/*
* If the foreign table has never been ANALYZEd, it will have relpages
* and reltuples equal to zero, which most likely has nothing to do
* with reality. We can't do a whole lot about that if we're not
* If the foreign table has never been ANALYZEd, it will have
* reltuples < 0, meaning "unknown". We can't do much if we're not
* allowed to consult the remote server, but we can use a hack similar
* to plancat.c's treatment of empty relations: use a minimum size
* estimate of 10 pages, and divide by the column-datatype-based width
* estimate to get the corresponding number of tuples.
*/
if (baserel->pages == 0 && baserel->tuples == 0)
if (baserel->tuples < 0)
{
baserel->pages = 10;
baserel->tuples =