Our document states that EXPLAIN can generate "Subplan Removed":
https://www.postgresql.org/docs/current/ddl-partitioning.html#DDL-PARTITION-PRUNING
It is possible to determine the number of partitions which were removed
during this phase by observing the “Subplans Removed” property in the
EXPLAIN output.
However, I can't figure out how to generate that string in EXPLAIN
output. I tried many examples and searched the web for examples but I
can't generate it in queries using git master.
For example, this website:
https://gist.github.com/amitlan/cd13271142bb2d26ae46b69afb675a31
has several EXPLAIN examples that show "Subplan Removed" but running the
queries in git master doesn't generate it for me.
Does anyone know how to generate this? Thanks.
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EDB https://enterprisedb.com
Embrace your flaws. They make you human, rather than perfect,
which you will never be.
