Em dom., 17 de mai. de 2020 às 10:31, Justin Pryzby <pryzby@xxxxxxxxxxxxx> escreveu:
On Sun, May 17, 2020 at 09:32:47AM -0300, Ranier Vilela wrote:
> I redid the same tests with vanila postgres and with empty tables.
> I'm surprised, why does the plan have 2550 rows in explain?
That's the *estimated* rowcount.
The planner tends to ignore table statistics which say the table is empty,
since that can lead to a terrible plan if it's not true (stats are out of date
or autovacuum threshold not hit).
Thanks for the explanation.
regards,
Ranier Vilela
