[Bug 220428] [NEW PORT] databases/pg_similarity: Set of functions and operators for executing similarity queries

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220428

            Bug ID: 220428
           Summary: [NEW PORT] databases/pg_similarity: Set of functions
                    and operators for executing similarity queries
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: amutu at amutu.com

Created attachment 184004
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=184004&action=edit
pg_similarity.shar

Pg_similarity is an extension to support similarity queries on PostgreSQL. The
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

QA:
portlint -AC
looks fine.

poudriere testport passed on 11.0R-amd64

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