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Allow ALTER TABLE ONLY on partitioned tables

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There is no need to forbid ALTER TABLE ONLY on partitioned tables,
when no partitions exist yet.  This can be handy for users who are
building up their partitioned table independently and will create actual
partitions later.

In addition, this is how pg_dump likes to operate in certain instances.

Author: Amit Langote, with some error message word-smithing by me
This commit is contained in:
Stephen Frost
2017-04-25 16:57:43 -04:00
parent 5f2b48d1dd
commit 9139aa1942
6 changed files with 108 additions and 48 deletions
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18
doc/src/sgml/ddl.sgml
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@ -2944,17 +2944,23 @@ VALUES ('Albany', NULL, NULL, 'NY');
Both <literal>CHECK</literal> and <literal>NOT NULL</literal>
constraints of a partitioned table are always inherited by all its
partitions. <literal>CHECK</literal> constraints that are marked
<literal>NO INHERIT</literal> are not allowed.
<literal>NO INHERIT</literal> are not allowed to be created on
partitioned tables.
</para>
</listitem>
<listitem>
<para>
The <literal>ONLY</literal> notation used to exclude child tables
will cause an error for partitioned tables in the case of
schema-modifying commands such as most <literal>ALTER TABLE</literal>
commands. For example, dropping a column from only the parent does
not make sense for partitioned tables.
Using <literal>ONLY</literal> to add or drop a constraint on only the
partitioned table is supported when there are no partitions. Once
partitions exist, using <literal>ONLY</literal> will result in an error
as adding or dropping constraints on only the partitioned table, when
partitions exist, is not supported. Instead, constraints can be added
or dropped, when they are not present in the parent table, directly on
the partitions. As a partitioned table does not have any data
directly, attempts to use <command>TRUNCATE</command>
<literal>ONLY</literal> on a partitioned table will always return an
error.
</para>
</listitem>