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Directly modify foreign tables.

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postgres_fdw can now sent an UPDATE or DELETE statement directly to
the foreign server in simple cases, rather than sending a SELECT FOR
UPDATE statement and then updating or deleting rows one-by-one.

Etsuro Fujita, reviewed by Rushabh Lathia, Shigeru Hanada, Kyotaro
Horiguchi, Albe Laurenz, Thom Brown, and me.
This commit is contained in:
Robert Haas
2016-03-18 13:48:58 -04:00
parent 3422feccca
commit 0bf3ae88af
21 changed files with 1515 additions and 125 deletions
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9
doc/src/sgml/postgres-fdw.sgml
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@ -484,6 +484,15 @@
extension that's listed in the foreign server's <literal>extensions</>
option. Operators and functions in such clauses must
be <literal>IMMUTABLE</> as well.
For an <command>UPDATE</> or <command>DELETE</> query,
<filename>postgres_fdw</> attempts to optimize the query execution by
sending the whole query to the remote server if there are no query
<literal>WHERE</> clauses that cannot be sent to the remote server,
no local joins for the query, and no row-level local <literal>BEFORE</> or
<literal>AFTER</> triggers on the target table. In <command>UPDATE</>,
expressions to assign to target columns must use only built-in data types,
<literal>IMMUTABLE</> operators, or <literal>IMMUTABLE</> functions,
to reduce the risk of misexecution of the query.
</para>
<para>