Don't guess, but read docs
http://www.postgresql.org/docs/8.4/interactive/textsearch-dictionaries.html#TEXTSEARCH-SIMPLE-DICTIONARY
12.6.2. Simple Dictionary
The simple dictionary template operates by converting the input token to lower case and checking it against a file of stop words. If it is found in the file then an empty array is returned, causing the token to be discarded. If not, the lower-cased form of the word is returned as the normalized lexeme. Alternatively, the dictionary can be configured to report non-stop-words as unrecognized, allowing them to be passed on to the next dictionary in the list.
d=# \dFd+ simple
List of text search dictionaries
Schema | Name | Template | Init options | Description
------------+--------+-------------------+--------------+-----------------------------------------------------------
pg_catalog | simple | pg_catalog.simple | | simple dictionary: just lower case and check for stopword
By default it has no Init options, so it doesn't check for stopwords.
On Thu, 22 Jul 2010, Andreas Joseph Krogh wrote:
On 07/22/2010 06:27 PM, John Gage wrote:
The easiest way to look at this is to give the simple dictionary a document
with to_tsvector() and see if stopwords pop out.
In my experience they do. In my experience, the simple dictionary just
breaks the document down into the space etc. separated words in the
document. It doesn't analyze further.
That's my experience too, I just want to make sure it doesn't actually have
any stopwords which I've missed. Trying many phrases and checking for
stopwords isn't really proving anything.
Can anybody confirm the "simple" dict. only lowercases the words and
"uniques" them?
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@xxxxxxxxxx, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
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