Doc: Improve clarity on partitioned table limitations

David Rowley <drowley@postgresql.org>

Commit: 5610ffaf00a53877ec973881b9b0b7a1acad689a
Author: David Rowley <drowley@postgresql.org>
Date: 2020-09-30T00:03:01Z
Releases: 13.1
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

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doc/src/sgml/ddl.sgml modified +2 −2

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