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Support MERGE into updatable views.

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This allows the target relation of MERGE to be an auto-updatable or
trigger-updatable view, and includes support for WITH CHECK OPTION,
security barrier views, and security invoker views.

A trigger-updatable view must have INSTEAD OF triggers for every type
of action (INSERT, UPDATE, and DELETE) mentioned in the MERGE command.
An auto-updatable view must not have any INSTEAD OF triggers. Mixing
auto-update and trigger-update actions (i.e., having a partial set of
INSTEAD OF triggers) is not supported.

Rule-updatable views are also not supported, since there is no
rewriter support for non-SELECT rules with MERGE operations.

Dean Rasheed, reviewed by Jian He and Alvaro Herrera.

Discussion: https://postgr.es/m/CAEZATCVcB1g0nmxuEc-A+gGB0HnfcGQNGYH7gS=7rq0u0zOBXA@mail.gmail.com
This commit is contained in:
Dean Rasheed
2024-02-29 15:56:59 +00:00
parent 8b29a119fd
commit 5f2e179bd3
23 changed files with 1380 additions and 288 deletions
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22
doc/src/sgml/ref/merge.sgml
View File

@@ -132,9 +132,9 @@ DELETE
<term><replaceable class="parameter">target_table_name</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of the target table to merge into.
If <literal>ONLY</literal> is specified before the table name, matching
rows are updated or deleted in the named table only. If
The name (optionally schema-qualified) of the target table or view to
merge into. If <literal>ONLY</literal> is specified before a table
name, matching rows are updated or deleted in the named table only. If
<literal>ONLY</literal> is not specified, matching rows are also updated
or deleted in any tables inheriting from the named table. Optionally,
<literal>*</literal> can be specified after the table name to explicitly
@@ -142,6 +142,16 @@ DELETE
<literal>ONLY</literal> keyword and <literal>*</literal> option do not
affect insert actions, which always insert into the named table only.
</para>
<para>
If <replaceable class="parameter">target_table_name</replaceable> is a
view, it must either be automatically updatable with no
<literal>INSTEAD OF</literal> triggers, or it must have
<literal>INSTEAD OF</literal> triggers for every type of action
(<literal>INSERT</literal>, <literal>UPDATE</literal>, and
<literal>DELETE</literal>) specified in the <literal>WHEN</literal>
clauses. Views with rules are not supported.
</para>
</listitem>
</varlistentry>
@@ -486,7 +496,11 @@ MERGE <replaceable class="parameter">total_count</replaceable>
the action's event type.
</para>
</listitem>
</orderedlist></para>
</orderedlist>
If the target relation is a view with <literal>INSTEAD OF ROW</literal>
triggers for the action's event type, they are used to perform the
action instead.
</para>
</listitem>
</orderedlist></para>
</listitem>