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docs: replace dblink() mention with foreign data mention 

Reported-by: steven.winfield@cantabcapital.com

Discussion: https://postgr.es/m/20171031105039.17183.850@wrigleys.postgresql.org
This commit is contained in:
Bruce Momjian 2018-01-12 16:53:25 -05:00
parent e9f2703ab7
commit 255f14183a
1 changed files with 3 additions and 2 deletions
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doc/src/sgml/textsearch.sgml
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@ -3614,8 +3614,9 @@ SELECT plainto_tsquery('supernovae stars');
allows the implementation of very fast searches with online update.
Partitioning can be done at the database level using table inheritance,
or by distributing documents over
servers and collecting search results using the <xref linkend="dblink"/>
module. The latter is possible because ranking functions use
servers and collecting external search results, e.g. via <link
linkend="ddl-foreign-data">Foreign Data</link> access.
The latter is possible because ranking functions use
only local information.
</para>