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Sync our Snowball stemmer dictionaries with current upstream.

Browse Source 
We haven't touched these since text search functionality landed in core
in 2007 :-(.  While the upstream project isn't a beehive of activity,
they do make additions and bug fixes from time to time.  Update our
copies of these files.

Also update our documentation about how to keep things in sync, since
they're not making distribution tarballs these days.  Fortunately,
their source code turns out to be a breeze to build.

Notable changes:

* The non-UTF8 version of the hungarian stemmer now works in LATIN2
not LATIN1.

* New stemmers have appeared for arabic, indonesian, irish, lithuanian,
nepali, and tamil.  These all work in UTF8, and the indonesian and
irish ones also work in LATIN1.

(There are some new stemmers that I did not incorporate, mainly because
their names don't match the underlying languages, suggesting that they're
not to be considered mainstream.)

Worth noting: the upstream Nepali dictionary was contributed by
Arthur Zakirov.

initdb forced because the contents of snowball_create.sql have
changed.

Still TODO: see about updating the stopword lists.

Arthur Zakirov, minor mods and doc work by me

Discussion: https://postgr.es/m/20180626122025.GA12647@zakirov.localdomain
Discussion: https://postgr.es/m/20180219140849.GA9050@zakirov.localdomain
This commit is contained in:
Tom Lane
2018-09-24 17:29:08 -04:00
parent b076eb7669
commit fd582317e1
88 changed files with 13198 additions and 7408 deletions
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10
doc/src/sgml/textsearch.sgml
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@ -3792,9 +3792,10 @@ Parser: "pg_catalog.default"
List text search dictionaries (add <literal>+</literal> for more detail).
<screen>
=&gt; \dFd
List of text search dictionaries
Schema | Name | Description
List of text search dictionaries
Schema | Name | Description
------------+-----------------+-----------------------------------------------------------
pg_catalog | arabic_stem | snowball stemmer for arabic language
pg_catalog | danish_stem | snowball stemmer for danish language
pg_catalog | dutch_stem | snowball stemmer for dutch language
pg_catalog | english_stem | snowball stemmer for english language
@ -3802,7 +3803,11 @@ Parser: "pg_catalog.default"
pg_catalog | french_stem | snowball stemmer for french language
pg_catalog | german_stem | snowball stemmer for german language
pg_catalog | hungarian_stem | snowball stemmer for hungarian language
pg_catalog | indonesian_stem | snowball stemmer for indonesian language
pg_catalog | irish_stem | snowball stemmer for irish language
pg_catalog | italian_stem | snowball stemmer for italian language
pg_catalog | lithuanian_stem | snowball stemmer for lithuanian language
pg_catalog | nepali_stem | snowball stemmer for nepali language
pg_catalog | norwegian_stem | snowball stemmer for norwegian language
pg_catalog | portuguese_stem | snowball stemmer for portuguese language
pg_catalog | romanian_stem | snowball stemmer for romanian language
@ -3810,6 +3815,7 @@ Parser: "pg_catalog.default"
pg_catalog | simple | simple dictionary: just lower case and check for stopword
pg_catalog | spanish_stem | snowball stemmer for spanish language
pg_catalog | swedish_stem | snowball stemmer for swedish language
pg_catalog | tamil_stem | snowball stemmer for tamil language
pg_catalog | turkish_stem | snowball stemmer for turkish language
</screen>
</para>