On 15.07.2016 21:34, Stefan Keller wrote:
I actually expect that stemming takes place for english and german.
And we will in fact have queries in english and in german as well.
So I think we still have some issues to resolve...?
I performed the following things:
- patch for PostgreSQL:
https://github.com/select-artur/postgres/tree/join_tsconfig
It adds new option for FTS dictionary mapping (JOIN). I want to
propose this patch to -hackers.
- dict_translate dictionary based on dict_xsyn contrib:
https://github.com/select-artur/dict_translate
This things are made for multilingual purpose and are interesting for
us. Maybe they will be helpful for you too.
Example:
1 - Create files:
$SHAREDIR/tsearch_data/geo_en.trn:
forest wald forst holz
$SHAREDIR/tsearch_data/geo_de.trn:
wald forest wood
forst forest wood
holz forest wood
2 - Execute queries:
=# CREATE TEXT SEARCH DICTIONARY geo_en (
Template = translate,
DictFile = geo_en,
InputDict = pg_catalog.english_stem);
=# CREATE TEXT SEARCH DICTIONARY geo_de (
Template = translate,
DictFile = geo_de,
InputDict = pg_catalog.german_stem);
=# CREATE TEXT SEARCH CONFIGURATION geo(COPY='simple');
=# ALTER TEXT SEARCH CONFIGURATION geo_ths
ALTER MAPPING FOR asciiword, asciihword, hword_asciipart,
word, hword, hword_part
WITH geo_en (JOIN), english_stem (JOIN), geo_de (JOIN), german_stem
(JOIN);
=# CREATE TABLE geo (id int, body_en text, body_de text);
=# INSERT INTO geo VALUES (1, 'forest', NULL), (2, NULL, 'wald');
3 - Sample queries:
=# SELECT * FROM geo WHERE to_tsvector('geo', body_en) @@
to_tsquery('geo', 'forests');
id | body_en | body_de
----+---------+---------
1 | forest | (null)
(1 row)
=# SELECT * FROM geo WHERE to_tsvector('geo', body_de) @@
to_tsquery('geo', 'forests');
id | body_en | body_de
----+---------+---------
2 | (null) | wald
3 | (null) | forst
(2 rows)
=# SELECT * FROM geo WHERE to_tsvector('geo', body_en) @@
to_tsquery('geo', 'walde');
id | body_en | body_de
----+---------+---------
1 | forest | (null)
(1 row)
I will be glad for your comments.
--
Artur Zakirov
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company
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