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Correct docs about partitions and EXCLUDE constraints.

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In version 17 we added support for cross-partition EXCLUDE
constraints, as long as they included all partition key columns and
compared them with equality (see 8c852ba9a4). I updated the docs for
exclusion constraints, but I missed that the docs for CREATE TABLE
still said that they were not supported. This commit fixes that.

Author: Paul A. Jungwirth <pj@illuminatedcomputing.com>
Co-authored-by: Jeff Davis <pgsql@j-davis.com>
Discussion: https://postgr.es/m/c955d292-b92d-42d1-a2a0-1ec6715a2546@illuminatedcomputing.com
Backpatch-through: 17
This commit is contained in:
Jeff Davis
2025-06-19 12:43:27 -07:00
parent 25505082f0
commit 0f5ac7f321
1 changed files with 12 additions and 5 deletions
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17
doc/src/sgml/ref/create_table.sgml
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@ -442,11 +442,6 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
the values in the new row, an error will be reported.
</para>
<para>
Partitioned tables do not support <literal>EXCLUDE</literal> constraints;
however, you can define these constraints on individual partitions.
</para>
<para>
See <xref linkend="ddl-partitioning"/> for more discussion on table
partitioning.
@ -1125,6 +1120,18 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
exclusion constraint on a subset of the table; internally this creates a
partial index. Note that parentheses are required around the predicate.
</para>
<para>
When establishing an exclusion constraint for a multi-level partition
hierarchy, all the columns in the partition key of the target
partitioned table, as well as those of all its descendant partitioned
tables, must be included in the constraint definition. Additionally,
those columns must be compared using the equality operator. These
restrictions ensure that potentially-conflicting rows will exist in the
same partition. The constraint may also refer to other columns which
are not a part of any partition key, which can be compared using any
appropriate operator.
</para>
</listitem>
</varlistentry>