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

[Cedric Duprez]

Hi Paul,

Thanks for your answer.
The database was restored from a cold physical backup (PGDATA copy).

Cedric

Le 08/01/2026 à 17:25, Paul Ramsey 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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