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Implement an API to let foreign-data wrappers actually be functional.

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This commit provides the core code and documentation needed.  A contrib
module test case will follow shortly.

Shigeru Hanada, Jan Urbanski, Heikki Linnakangas
This commit is contained in:
Tom Lane
2011-02-20 00:17:18 -05:00
parent d5813488a4
commit bb74240794
39 changed files with 1202 additions and 62 deletions
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13
doc/src/sgml/ref/create_foreign_data_wrapper.sgml
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@ -119,18 +119,13 @@ CREATE FOREIGN DATA WRAPPER <replaceable class="parameter">name</replaceable>
<title>Notes</title>
<para>
At the moment, the foreign-data wrapper functionality is very
rudimentary. The purpose of foreign-data wrappers, foreign
servers, and user mappings is to store this information in a
standard way so that it can be queried by interested applications.
One such application is <application>dblink</application>;
see <xref linkend="dblink">. The functionality to actually query
external data through a foreign-data wrapper library does not exist
yet.
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).
</para>
<para>
There is currently one foreign-data wrapper validator function
There is one built-in foreign-data wrapper validator function
provided:
<filename>postgresql_fdw_validator</filename>, which accepts
options corresponding to <application>libpq</> connection