PostGIS 3.6.1 - ERROR: operator is not unique: public.geometry = public.geometry
Cedric Duprez
cedric.duprez at ign.fr
Thu Jan 8 09:30:24 PST 2026
Well done!
You're right, I changed my search path excluding "public" from it before
playing the query.
If I add "public" in the search path, it works fine again.
Cedric
Le 08/01/2026 à 18:14, Regina Obe a écrit :
>
> Cedric,
>
> Good news. I was able to replicate.
>
> I noticed in your output you have the fully qualified type name, which
> means you don’t have postgis schema in your search path.
>
> To replicate I did:
>
> set search_path='pg_catalog';
>
> SELECT 'POINT EMPTY'::public.geometry = 'POINT EMPTY'::public.geometry;
>
> Gives:
>
> ERROR: operator is not unique: public.geometry = public.geometry LINE
> 1: SELECT 'POINT EMPTY'::public.geometry = 'POINT EMPTY'::publi... ^
>
> So I’m guessing we have some code in our = path that is not schema
> qualified.
>
> I’ve ticketed the issue here:
>
> https://trac.osgeo.org/postgis/ticket/6033
>
> Paul,
>
> Can you confirm you can replicate by changing your search_path?
>
> *From:*Cedric Duprez <cedric.duprez at ign.fr>
> *Sent:* Thursday, January 8, 2026 12:05 PM
> *To:* Regina Obe <lr at pcorp.us>; 'Paul Ramsey' <pramsey at cleverelephant.ca>
> *Cc:* postgis-users at lists.osgeo.org
> *Subject:* Re: PostGIS 3.6.1 - ERROR: operator is not unique:
> public.geometry = public.geometry
>
> 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
> <file:///C:/Windows/ServiceProfiles/NetworkService/AppData/Local/proj>
> DATABASE_PATH=C:\Program <file:///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>
> <mailto:postgis-users at lists.osgeo.org>
> *Sent:* Thursday, January 8, 2026 11:26 AM
> *To:* Cedric Duprez <cedric.duprez at ign.fr>
> <mailto: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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