From: Tom Lane <tgl@sss.pgh.pa.us>
To: bjdev.gthb@laposte.net
Cc: pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #18654: From fuzzystrmatch, levenshtein function with costs parameters produce incorrect results
Date: Mon, 14 Oct 2024 12:01:03 -0400
Message-ID: <3737494.1728921663@sss.pgh.pa.us> (raw)
In-Reply-To: <18654-c09f568d3ba6dfcd@postgresql.org>
References: <18654-c09f568d3ba6dfcd@postgresql.org>
PG Bug reporting form <noreply@postgresql.org> writes:
> But if we use this function with parameters other than 1 (the default) the
> result is incorrect
> SELECT levenshtein('horses','shorse',1,1,1) => 2 (correct)
> SELECT levenshtein('horses','shorse',100,10,1) => 101 (INCORRECT)
> The correct result is 6 (all the letter have to be substitute and it's not
> possible to have a lower score with others operations)
Hmm, works for me:
u8=# create extension fuzzystrmatch;
CREATE EXTENSION
u8=# SELECT levenshtein('horses','shorse',1,1,1);
levenshtein
-------------
2
(1 row)
u8=# SELECT levenshtein('horses','shorse',100,10,1);
levenshtein
-------------
6
(1 row)
I confess bafflement about why you're getting wrong answers.
You seem to be using a slightly out of date Postgres, but
none of this code has changed meaningfully since about 2016.
Maybe you hit a compiler bug? Where did you get this copy
of Postgres from --- or if you built it yourself, what build
options did you use?
regards, tom lane
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To: pgsql-bugs@postgresql.org
Cc: tgl@sss.pgh.pa.us, bjdev.gthb@laposte.net, pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #18654: From fuzzystrmatch, levenshtein function with costs parameters produce incorrect results
In-Reply-To: <3737494.1728921663@sss.pgh.pa.us>
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