From: Manu <manuelreyesbravo@gmail.com>
To: pgsql-bugs@lists.postgresql.org
Cc: kehan5800@gmail.com
Subject: Re: BUG #19701: GIN trigram index loses rows at similarity_threshold
 0
Date: Wed, 23 Sep 2026 16:26:42 -0300
Message-ID: <179019160285.4009503.14265883830439530659@gmail.com>
In-Reply-To: <19701-c861a62e79bf49ce@postgresql.org>
References: <19701-c861a62e79bf49ce@postgresql.org>
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Hi,

I can reproduce this on master (374522aa63a), and it is wider than the
report.  With the thresholds at 0, on 5002 rows (100 of them empty
strings), a sequential scan returns all 5002 rows for each of these
queries.  The indexes return:

- v % 'apple', 'apple' <% v, 'apple' <<% v: GIN 315, GiST 5002
- v % '', v % '#' (no trigrams): GIN 0, GiST 0

So all three similarity operators are affected in GIN, and GiST is
affected too, when the query has no trigrams.  There are two causes:

1. gin_extract_query_trgm() returns the query's trigrams, so a GIN scan
   only visits rows that share one of them.  At a threshold of 0 every
   row matches, including the ones that share none.  The fix asks for
   GIN_SEARCH_MODE_ALL when the threshold is 0, as the function already
   does when the query has no trigrams.

2. When the query has no trigrams, gin_trgm_consistent() and
   gin_trgm_triconsistent() return false outright, and so does
   gtrgm_consistent() on GiST internal pages.  The similarity with
   such a query is 0, which a threshold of 0 accepts.  GiST leaf pages
   already get this right, which is why the report's three-row table
   (a single leaf page) shows GiST as correct.

The attached patch fixes both and adds a test to the existing threshold
test on the restaurants table, for GiST and GIN.  Without the C changes
the new test fails (GiST returns 0 for the empty query, GIN returns
10000 and 0 instead of 20000); with them, pg_trgm's tests pass.  With
the default thresholds, all the queries above return the same as
before.

It applies cleanly to REL_14_STABLE through REL_19_STABLE; I built and
ran the pg_trgm tests on REL_18_STABLE as well.

Regards,
Manu

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