From: David Rowley <drowley@postgresql.org>
Date: Wed, 30 Sep 2020 00:05:18 +0000 (+1300)
Subject: Doc: Improve clarity on partitioned table limitations
X-Git-Tag: REL_11_10~71
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ab0c9c073563c61f9761d8d5fa02ea070a55cb85;p=thirdparty%2Fpostgresql.git

Doc: Improve clarity on partitioned table limitations

Explicitly mention that primary key constraints are also included in the
limitation that the constraint columns must be a superset of the partition key
columns.

Wording suggestion from Tom Lane.

Discussion: https://postgr.es/m/64062533.78364.1601415362244@mail.yahoo.com
Backpatch-through: 11, where unique constraints on partitioned tables were added
---

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index 18155f1a475..27922867a7a 100644
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -3460,8 +3460,8 @@ ALTER INDEX measurement_city_id_logdate_key
 
      <listitem>
       <para>
-       Unique constraints on partitioned tables must include all the
-       partition key columns.  This limitation exists because
+       Unique constraints (and hence primary keys) on partitioned tables must
+       include all the partition key columns.  This limitation exists because
        <productname>PostgreSQL</productname> can only enforce
        uniqueness in each partition individually.
       </para>