constraint_exclusion not working correctly
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/16/ddl-partitioning.html
Description:
Hello,
I have noted that, in order for constraint exclusion to work correctly when
partitioning using inheritance, we must use simple comparisons in check
constraints (e.g., =, >=, <=, BETWEEN, etc.). If conditions are combined
using AND or OR, unnecessary partitions may be scanned.
Therefore, the example in this PostgreSQL documentation will not work
properly with constraints like CHECK (logdate >= DATE '2006-02-01' AND
logdate < DATE '2006-03-01'). However, it will work with the BETWEEN
operator.
Regards
PG Doc comments form <noreply@postgresql.org> writes:
I have noted that, in order for constraint exclusion to work correctly when
partitioning using inheritance, we must use simple comparisons in check
constraints (e.g., =, >=, <=, BETWEEN, etc.). If conditions are combined
using AND or OR, unnecessary partitions may be scanned.
Therefore, the example in this PostgreSQL documentation will not work
properly with constraints like CHECK (logdate >= DATE '2006-02-01' AND
logdate < DATE '2006-03-01'). However, it will work with the BETWEEN
operator.
The example in the documentation works perfectly well for me.
regards, tom lane