PostGIS 3.6.1 - ERROR: operator is not unique: public.geometry = public.geometry

[Paul Ramsey]

No, this is clearly a postgres/postgis thing, it doesn't hit on geos or
proj code lines. I was testing with pg18, but I see now Regina has
replicated on pg17 also, so that was the one thing I was working on
clarifying in terms of reproduction.

P

On Thu, Jan 8, 2026 at 8:54 AM Arthur Bazin <arthurbazin at gmail.com> wrote:

> @paul, you have not the exact same version of PostGIS and therefore of
> GEOS and PROJ.
> Maybe the origin of the non reproductibility ?
>
> Best regards
> Arthur
>
>
>
> Le jeu. 8 janv. 2026, 17:26, Paul Ramsey via postgis-users <
> postgis-users at lists.osgeo.org> a écrit :
>
>> This is odd, I am not able to replicate...
>>
>>
>> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>>  POSTGIS="3.6.1dev 3.6.0-6-gdb18a9a49" PGSQL="180"
>> GEOS="3.15.0dev-CAPI-1.21.0" PROJ="9.3.0 NETWORK_ENABLED=ON URL_ENDPOINT=
>> https://cdn.proj.org
>> USER_WRITABLE_DIRECTORY=/Users/pramsey/Library/Application Support/proj
>> DATABASE_PATH=/usr/local/share/proj/proj.db" (compiled against PROJ 9.3.0)
>> LIBXML="2.9.13" LIBJSON="0.17" LIBPROTOBUF="1.4.1" WAGYU="0.5.0 (Internal)"
>> (1 row)
>>
>> postgis_reg=# SELECT 'POINT EMPTY'::public.geometry = 'POINT
>> EMPTY'::public.geometry;
>>  ?column?
>> ----------
>>  t
>> (1 row)
>>
>>
>> Is this a database that has gone through upgrade stages, or a blank fresh
>> database?
>>
>> P
>>
>> On Thu, Jan 8, 2026 at 8:21 AM Cedric Duprez <cedric.duprez at ign.fr>
>> wrote:
>>
>>> Hi all,
>>>
>>> I'm facing a potential bug with PostGIS 3.6.1 on PostgreSQL 17.7.
>>> Here is what I get with postgis_full_version() :  POSTGIS="3.6.1
>>> f533623" [EXTENSION] PGSQL="170" GEOS="3.12.1-CAPI-1.18.1" PROJ="9.4.0
>>> NETWORK_ENABLED=OFF URL_ENDPOINT=https://cdn.proj.org
>>> USER_WRITABLE_DIRECTORY=/tmp/proj DATABASE_PATH=/usr/share/proj/proj.db"
>>> (compiled against PROJ 9.4.0) GDAL="GDAL 3.8.4, released 2024/02/08"
>>> LIBXML="2.9.14" LIBJSON="0.17" LIBPROTOBUF="1.4.1" WAGYU="0.5.0 (Internal)"
>>> RASTER
>>>
>>> When I execute this query:
>>> SELECT 'POINT EMPTY'::public.geometry = 'POINT EMPTY'::public.geometry;
>>> I get the following error:
>>> ERROR: operator is not unique: public.geometry = public.geometry
>>>
>>> It seems to be a regression, since I didn't have this error on previous
>>> versions of PostGIS (3.5).
>>>
>>> How can this problem be solved?
>>> Thanks in advance for you help,
>>>
>>> Cedric
>>>
>>
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