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Clarify docs about limitations of constraint exclusion with partitions 

The current wording can confuse the reader about constraint exclusion
being available at query execution, but this only applies to partition
pruning.

Reported-by: Shouyu Luo
Author: David Rowley
Reviewed-by: Chapman Flack, Amit Langote
Discussion: https://postgr.es/m/15629-2ef8b22e61f8333f@postgresql.org
This commit is contained in:
Michael Paquier 2019-02-12 12:02:31 +09:00
parent 6cd404b344
commit 6af8c79868
1 changed files with 2 additions and 2 deletions
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doc/src/sgml/ddl.sgml
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@ -4009,8 +4009,8 @@ EXPLAIN SELECT count(*) FROM measurement WHERE logdate >= DATE '2008-01-01';
<itemizedlist>
<listitem>
<para>
Constraint exclusion is only applied during query planning; unlike
partition pruning, it cannot be applied during query execution.
Constraint exclusion is only applied during query planning, unlike
partition pruning, which can also be applied during query execution.
</para>
</listitem>