PGroonga 2.3.4 released

Hi,

PGroonga 2.3.4 has been released!

### [About PGroonga](https://pgroonga.github.io/)

* 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]:https://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]: https://groonga.org/

See the following benchmark results for performance:

* Benchmark result for PGroonga, textsearch and pg_trgm with English Wikipedia
https://pgroonga.github.io/reference/pgroonga-versus-textsearch-and-pg-trgm.html
* Benchmark result for PGroonga and pg_bigm with Japanese Wikipedia
https://pgroonga.github.io/reference/pgroonga-versus-pg-bigm.html

PGroonga also supports JSON search. You can use each value
for condition. You can also perform full text search against
all texts in JSON like textsearch in PostgreSQL 10 does.

### Users

Here are PGroonga users:

* Zulip: https://zulipchat.com/
* Powerful open source group chat

https://pgroonga.github.io/users/

### Changes

We implemented big features in PGroonga 2.3.3.
Therefore, we also announce features of PGroonga 2.3.3 in this announcement.

Here are highlights in PGroonga 2.3.3 and 2.3.4:

* Added support for PostgreSQL's RLS(Row Level security)

* Dropped support for PostgreSQL 9.6.

* Added support for applying PGroonga's WAL automatically
in the standby server when we use stream replication.

* Added support for AlmaLinux 8.

* Fix a crash bug when EXPLAIN ANALYZE is executed with seqscan.

This bug only occures in PGroonga 2.3.3.

* Added support for crash safe. (Experimental feature)

See the following release note URL for details:

* https://groonga.org/en/blog/2021/11/09/pgroonga-2.3.4.html

### 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,