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

"Regina Obe" <[email protected]> Thu, 8 Jan 2026 12:00:58 -0500
Newsgroups gmane.comp.gis.postgis
Message-ID <[email protected]>
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Arthur,

=20

Are you able to replicate?  I can=E2=80=99t with the same version of =
PostGIS and PostgreSQL.

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From: Arthur Bazin <[email protected]>=20
Sent: Thursday, January 8, 2026 11:55 AM
To: Paul Ramsey <[email protected]>
Cc: PostGIS Users Discussion <[email protected]>
Subject: Re: PostGIS 3.6.1 - ERROR: operator is not unique: =
public.geometry =3D public.geometry

=20

@paul, you have not the exact same version of PostGIS and therefore of =
GEOS and PROJ.=20

Maybe the origin of the non reproductibility ?=20

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Best regards

Arthur

=20

=20

=20

Le jeu. 8 janv. 2026, 17:26, Paul Ramsey via postgis-users =
<[email protected] <mailto:[email protected]> > =
a =C3=A9crit :

This is odd, I am not able to replicate...

=20

-------------------------------------------------------------------------=
-------------------------------------------------------------------------=
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-------------------------------------------------------------------------=
---
 POSTGIS=3D"3.6.1dev 3.6.0-6-gdb18a9a49" PGSQL=3D"180" =
GEOS=3D"3.15.0dev-CAPI-1.21.0" PROJ=3D"9.3.0 NETWORK_ENABLED=3DON =
URL_ENDPOINT=3Dhttps://cdn.proj.org =
USER_WRITABLE_DIRECTORY=3D/Users/pramsey/Library/Application =
Support/proj DATABASE_PATH=3D/usr/local/share/proj/proj.db" (compiled =
against PROJ 9.3.0) LIBXML=3D"2.9.13" LIBJSON=3D"0.17" =
LIBPROTOBUF=3D"1.4.1" WAGYU=3D"0.5.0 (Internal)"
(1 row)

postgis_reg=3D# SELECT 'POINT EMPTY'::public.geometry =3D 'POINT =
EMPTY'::public.geometry;
 ?column?=20
----------
 t
(1 row)

=20

=20

Is this a database that has gone through upgrade stages, or a blank =
fresh database?

=20

P

=20

On Thu, Jan 8, 2026 at 8:21=E2=80=AFAM Cedric Duprez =
<[email protected] <mailto:[email protected]> > 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=3D"3.6.1 =
f533623" [EXTENSION] PGSQL=3D"170" GEOS=3D"3.12.1-CAPI-1.18.1" =
PROJ=3D"9.4.0 NETWORK_ENABLED=3DOFF URL_ENDPOINT=3Dhttps://cdn.proj.org =
USER_WRITABLE_DIRECTORY=3D/tmp/proj =
DATABASE_PATH=3D/usr/share/proj/proj.db" (compiled against PROJ 9.4.0) =
GDAL=3D"GDAL 3.8.4, released 2024/02/08" LIBXML=3D"2.9.14" =
LIBJSON=3D"0.17" LIBPROTOBUF=3D"1.4.1" WAGYU=3D"0.5.0 (Internal)" RASTER

When I execute this query:=20
SELECT 'POINT EMPTY'::public.geometry =3D 'POINT =
EMPTY'::public.geometry;
I get the following error:
ERROR: operator is not unique: public.geometry =3D 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

=09

=20


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style=3D'word-wrap:break-word'><div class=3DWordSection1><p =
class=3DMsoNormal>Arthur,<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Are you able =
to replicate?=C2=A0 I can=E2=80=99t with the same version of PostGIS and =
PostgreSQL.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt'><div><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Arthur Bazin &lt;[email protected]&gt; <br><b>Sent:</b> Thursday, =
January 8, 2026 11:55 AM<br><b>To:</b> Paul Ramsey =
&lt;[email protected]&gt;<br><b>Cc:</b> PostGIS Users Discussion =
&lt;[email protected]&gt;<br><b>Subject:</b> Re: PostGIS =
3.6.1 - ERROR: operator is not unique: public.geometry =3D =
public.geometry<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><div><p =
class=3DMsoNormal>@paul, you have not the exact same version of PostGIS =
and therefore of GEOS and PROJ.&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal>Maybe the origin of the non reproductibility =
?&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Best regards<o:p></o:p></p></div><div><p =
class=3DMsoNormal>Arthur<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>Le =
jeu. 8 janv. 2026, 17:26, Paul Ramsey via postgis-users &lt;<a =
href=3D"mailto:[email protected]" =
target=3D"_blank">[email protected]</a>&gt; a =
=C3=A9crit&nbsp;:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><p class=3DMsoNormal>This =
is odd, I am not able to replicate...<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>-------------------------------------------------------=
-------------------------------------------------------------------------=
-------------------------------------------------------------------------=
-------------------------------------------------------------------------=
-------------------------------------------------------------------------=
---------------------<br>&nbsp;POSTGIS=3D&quot;3.6.1dev =
3.6.0-6-gdb18a9a49&quot; PGSQL=3D&quot;180&quot; =
GEOS=3D&quot;3.15.0dev-CAPI-1.21.0&quot; PROJ=3D&quot;9.3.0 =
NETWORK_ENABLED=3DON URL_ENDPOINT=3D<a href=3D"https://cdn.proj.org" =
target=3D"_blank">https://cdn.proj.org</a> =
USER_WRITABLE_DIRECTORY=3D/Users/pramsey/Library/Application =
Support/proj DATABASE_PATH=3D/usr/local/share/proj/proj.db&quot; =
(compiled against PROJ 9.3.0) LIBXML=3D&quot;2.9.13&quot; =
LIBJSON=3D&quot;0.17&quot; LIBPROTOBUF=3D&quot;1.4.1&quot; =
WAGYU=3D&quot;0.5.0 (Internal)&quot;<br>(1 row)<br><br>postgis_reg=3D# =
SELECT 'POINT EMPTY'::public.geometry =3D 'POINT =
EMPTY'::public.geometry;<br>&nbsp;?column? =
<br>----------<br>&nbsp;t<br>(1 row)<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Is this a database that has gone through upgrade =
stages, or a blank fresh database?<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>P<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>On =
Thu, Jan 8, 2026 at 8:21<span =
style=3D'font-family:"Arial",sans-serif'>=E2=80=AF</span>AM Cedric =
Duprez &lt;<a href=3D"mailto:[email protected]" =
target=3D"_blank">[email protected]</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><p class=3DMsoNormal>Hi =
all,<br><br>I'm facing a potential bug with PostGIS 3.6.1 on PostgreSQL =
17.7.<br>Here is what I get with postgis_full_version() :&nbsp; =
POSTGIS=3D&quot;3.6.1 f533623&quot; [EXTENSION] PGSQL=3D&quot;170&quot; =
GEOS=3D&quot;3.12.1-CAPI-1.18.1&quot; PROJ=3D&quot;9.4.0 =
NETWORK_ENABLED=3DOFF URL_ENDPOINT=3D<a href=3D"https://cdn.proj.org" =
target=3D"_blank">https://cdn.proj.org</a> =
USER_WRITABLE_DIRECTORY=3D/tmp/proj =
DATABASE_PATH=3D/usr/share/proj/proj.db&quot; (compiled against PROJ =
9.4.0) GDAL=3D&quot;GDAL 3.8.4, released 2024/02/08&quot; =
LIBXML=3D&quot;2.9.14&quot; LIBJSON=3D&quot;0.17&quot; =
LIBPROTOBUF=3D&quot;1.4.1&quot; WAGYU=3D&quot;0.5.0 (Internal)&quot; =
RASTER<br><br>When I execute this query:&nbsp;<br>SELECT 'POINT =
EMPTY'::public.geometry =3D 'POINT EMPTY'::public.geometry;<br>I get the =
following error:<br>ERROR: operator is not unique: public.geometry =3D =
public.geometry<br><br>It seems to be a regression, since I didn't have =
this error on previous versions of PostGIS (3.5).<br><br>How can this =
problem be solved?<br>Thanks in advance for you =
help,<br><br>Cedric<o:p></o:p></p></div></blockquote></div></blockquote><=
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class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></div></div></div></div></di=
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