[ANN] PGroonga 1.1.1 - Make PostgreSQL fast full text search platform for all languages

Hi,

PGroonga 1.1.1 has been released!

http://groonga.org/en/blog/2016/08/31/pgroonga-1.1.1.html

### About PGroonga

https://pgroonga.github.io/

PGroonga is a PostgreSQL extension that makes PostgreSQL
fast full text search platform for all languages!
It's released under PostgreSQL license.

There are some PostgreSQL extensions that improves full text
search feature of PostgreSQL such as pg_trgm(*1).

(*1) http://www.postgresql.org/docs/current/static/pgtrgm.html

pg_trgm doesn't support languages that use non-alphanumerics
characters such as Japanese and Chinese.

PGroonga supports all languages, provides rich full text
search related features and is very fast. Because PGroonga
uses Groonga(*2) that is a full-fledged full text search
engine as backend.

(*2) http://groonga.org/

PGroonga also supports JSON search. You can use each value
for condition. You can also perform full text search against
all texts in JSON. No other extension such as JsQuery(*3)
doesn't provide full text search feature against JSON.

(*3) https://github.com/postgrespro/jsquery

### Changes

In this release, performance improvement is major
improvement. You can get more performance by just upgrading
to 1.1.1.

Here are changes since 1.0.9:

* Improved the number of hits estimation. It helps that
planner choose suitable index use or not index
use. Therefore, total performance is improved.

* Fixed a bug that needless recheck is ran on bitmap heap
scan. If recheck is ran, performance is down.

* Added pgroonga.match_positions_character function that
returns match positions in character.

https://pgroonga.github.io/reference/functions/pgroonga-match-positions-character.html

* Added pgroonga.flush function that flushes buffered
changes in memory.

https://pgroonga.github.io/reference/functions/pgroonga-flush.html

### New users

Zulip, open source group chat application by Dropbox, starts
supporting full text search for all languages. It's based on
PGroonga. Zulip used built-in full text search feature. So
Zulip supports only one language (English) at the same
time. PGroonga can support all languages at the same.

Zulip: https://zulip.org/

If you're a PGroonga user, please tell your use case:
https://pgroonga.github.io/users/

### Usage

You can use PGroonga without full text search knowledge. You
just create an index and puts a condition into WHERE:

CREATE INDEX index_name ON table USING pgroonga (column);

SELECT * FROM table WHERE column @@ 'PostgreSQL';

You can also use LIKE to use PGroonga. PGroonga provides a
feature that performs LIKE with index. LIKE with PGroonga
index is faster than LIKE without index. It means that you
can improve performance without changing your application
that uses the following SQL:

SELECT * FROM table WHERE column LIKE '%PostgreSQL%';

Are you interested in PGroonga? Please install(*4) and try
tutorial(*5). You can know all PGroonga features.

(*4) https://pgroonga.github.io/install/
(*5) https://pgroonga.github.io/tutorial/

You can install PGroonga easily. Because PGroonga provides
packages for major platforms. There are binaries for
Windows.

Thanks,
--
kou