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Support writable foreign tables.

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This patch adds the core-system infrastructure needed to support updates
on foreign tables, and extends contrib/postgres_fdw to allow updates
against remote Postgres servers.  There's still a great deal of room for
improvement in optimization of remote updates, but at least there's basic
functionality there now.

KaiGai Kohei, reviewed by Alexander Korotkov and Laurenz Albe, and rather
heavily revised by Tom Lane.
This commit is contained in:
Tom Lane
2013-03-10 14:14:53 -04:00
parent 7f49a67f95
commit 21734d2fb8
29 changed files with 3672 additions and 347 deletions
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10
doc/src/sgml/ref/create_foreign_data_wrapper.sgml
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@ -117,9 +117,10 @@ CREATE FOREIGN DATA WRAPPER <replaceable class="parameter">name</replaceable>
<title>Notes</title>
<para>
At the moment, the foreign-data wrapper functionality is rudimentary.
There is no support for updating a foreign table, and optimization of
queries is primitive (and mostly left to the wrapper, too).
<productname>PostgreSQL</>'s foreign-data functionality is still under
active development. Optimization of queries is primitive (and mostly left
to the wrapper, too). Thus, there is considerable room for future
performance improvements.
</para>
</refsect1>
@ -158,7 +159,7 @@ CREATE FOREIGN DATA WRAPPER mywrapper
9075-9 (SQL/MED), with the exception that the <literal>HANDLER</literal>
and <literal>VALIDATOR</literal> clauses are extensions and the standard
clauses <literal>LIBRARY</literal> and <literal>LANGUAGE</literal>
are not implemented in PostgreSQL.
are not implemented in <productname>PostgreSQL</>.
</para>
<para>
@ -175,6 +176,7 @@ CREATE FOREIGN DATA WRAPPER mywrapper
<member><xref linkend="sql-dropforeigndatawrapper"></member>
<member><xref linkend="sql-createserver"></member>
<member><xref linkend="sql-createusermapping"></member>
<member><xref linkend="sql-createforeigntable"></member>
</simplelist>
</refsect1>