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

[Cedric Duprez]

I get two lines with the following query:

SELECT oprcode, oprleft::regtype, oprright::regtype
FROM pg_catalog.pg_operator
WHERE oprname = '=' AND oprleft::regtype::text IN('public.geometry', 
'public.geography')
ORDER BY oprleft, oprright;

Query result:

oprcode            |oprleft         |oprright
-------------------+----------------+----------------
public.geometry_eq |public.geometry |public.geometry
public.geography_eq|public.geography|public.geography

Extensions are :

extname           |extversion
------------------+----------
plpgsql           |1.0
ogr_fdw           |1.1
plr               |8.4.8.2
pg_stat_statements|1.11
pgcrypto          |1.3
tablefunc         |1.0
postgis_raster    |3.6.1
postgis           |3.6.1

Le 08/01/2026 à 17:58, Regina Obe a écrit :
>
> I can’t replicate on my PostgreSQL 17.7 either even with upgrading 
> from PostGIS 3.5.3 to 3.6.1
>
> PostgreSQL 17.7 on x86_64-windows, compiled by msvc-19.44.35221, 
> 64-bit POSTGIS="3.6.1 3.6.1" [EXTENSION] PGSQL="170" 
> GEOS="3.14.1-CAPI-1.20.5" PROJ="8.2.1 NETWORK_ENABLED=OFF 
> URL_ENDPOINT=https://cdn.proj.org 
> USER_WRITABLE_DIRECTORY=C:\Windows\ServiceProfiles\NetworkService\AppData\Local/proj 
> DATABASE_PATH=C:\Program 
> Files\PostgreSQL\18\share\contrib\postgis-3.6\proj\proj.db" (compiled 
> against PROJ 8.2.1) LIBXML="2.12.5" LIBJSON="0.12" LIBPROTOBUF="1.2.1" 
> WAGYU="0.5.0 (Internal)"
>
> Perhaps you are having a conflict with another extension or it’s issue 
> with upgrade from earlier.  I recall we did have to fix an issue with =
>
> Can you show what the below queries output:
>
> SELECT oprcode, oprleft::regtype, oprright::regtype
>
> FROM pg_catalog.pg_operator
>
> WHERE oprname = '=' AND oprleft::regtype::text IN('geometry', 'geography')
>
> ORDER BY oprleft, oprright;
>
> Should be:
>
>    oprcode    |  oprleft  | oprright
>
> --------------+-----------+-----------
>
> geometry_eq  | geometry  | geometry
>
> geography_eq | geography | geography
>
> (2 rows)
>
> SELECT  extname, extversion FROM pg_catalog.pg_extension;
>
> *From:*Paul Ramsey via postgis-users <postgis-users at lists.osgeo.org>
> *Sent:* Thursday, January 8, 2026 11:26 AM
> *To:* Cedric Duprez <cedric.duprez at ign.fr>
> *Cc:* postgis-users at lists.osgeo.org
> *Subject:* Re: PostGIS 3.6.1 - ERROR: operator is not unique: 
> public.geometry = public.geometry
>
> 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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