Good morning/afternoon all
I am currently writing a few articles about PostgreSQL's full text capabilities
and have a question about the Ispell dictionary which I cannot seem to find an
answer to. It is probably a very simple issue, so forgive my ignorance.
In one article I am explaining about dictionaries and I have setup a sample
configuration which maps most token categories to only use a Ispell dictionary
(timusan_ispell) which has a default configuration:
CREATE TEXT SEARCH DICTIONARY timusan_ispell (
TEMPLATE = ispell,
DictFile = en_us,
AffFile = en_us,
StopWords = english
);
When I run a simple query like "SELECT to_tsvector('timusan-ispell','smiling')"
I get back the following tsvector:
'smile':1 'smiling':1
As you can see I get two lexemes with the same pointer.
The question here is: why does this happen?
Is it normal behavior for the Ispell dictionary to emit multiple lexemes for a
single token? And if so, is this efficient? I mean, why could it not simply
save one lexeme 'smile' which (same as the snowball dictionary) would match
'smiling' as well if later matched with the accompanying tsquery?
Thanks!
Cheers,
Tim
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