implementation is tightly integrated in the RDBMS in the sense that it defines
operators so instead of the traditional operators (= and <>) you can use ~~~
and ! (any of these operators represents a similarity function).
pg_similarity has three main components:
* Functions: a set of functions that implements similarity algorithms available
in the literature. These functions can be used as UDFs and, will be the base
for implementing the similarity operators;
* Operators: a set of operators defined at the top of similarity functions. They
use similarity functions to obtain the similarity threshold and, compare its
value to a user-defined threshold to decide if it is a match or not;
* Session Variables: a set of variables that store similarity function
parameters. Theses variables can be defined at run time.
WWW: http://pgsimilarity.projects.pgfoundry.org
PR: 220428
Submitted by: Jov <amutu@amutu.com>
Sponsored by: iXsystems Inc.
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