Clarify docs about limitations of constraint exclusion with partitions

Michael Paquier <michael@paquier.xyz>

Commit: 6af8c79868a3d51d9d0ae96c71596bba33780c59
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-02-12T03:02:31Z
Releases: 11.3
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

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doc/src/sgml/ddl.sgml modified +2 −2

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