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--></style></head><body lang=EN-US link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>I can’t replicate on my PostgreSQL 17.7 either even with upgrading from PostGIS 3.5.3 to 3.6.1<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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)"<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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 = <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Can you show what the below queries output:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>SELECT oprcode, oprleft::regtype, oprright::regtype <o:p></o:p></p><p class=MsoNormal>FROM pg_catalog.pg_operator <o:p></o:p></p><p class=MsoNormal>WHERE oprname = '=' AND oprleft::regtype::text IN('geometry', 'geography')<o:p></o:p></p><p class=MsoNormal>ORDER BY oprleft, oprright;<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Should be:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> oprcode | oprleft | oprright<o:p></o:p></p><p class=MsoNormal>--------------+-----------+-----------<o:p></o:p></p><p class=MsoNormal> geometry_eq | geometry | geometry<o:p></o:p></p><p class=MsoNormal> geography_eq | geography | geography<o:p></o:p></p><p class=MsoNormal>(2 rows)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>SELECT extname, extversion FROM pg_catalog.pg_extension;<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Paul Ramsey via postgis-users <postgis-users@lists.osgeo.org> <br><b>Sent:</b> Thursday, January 8, 2026 11:26 AM<br><b>To:</b> Cedric Duprez <cedric.duprez@ign.fr><br><b>Cc:</b> postgis-users@lists.osgeo.org<br><b>Subject:</b> Re: PostGIS 3.6.1 - ERROR: operator is not unique: public.geometry = public.geometry<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>This is odd, I am not able to replicate...<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------<br> 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=<a href="https://cdn.proj.org">https://cdn.proj.org</a> 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)"<br>(1 row)<br><br>postgis_reg=# SELECT 'POINT EMPTY'::public.geometry = 'POINT EMPTY'::public.geometry;<br> ?column? <br>----------<br> t<br>(1 row)<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Is this a database that has gone through upgrade stages, or a blank fresh database?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>P<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Thu, Jan 8, 2026 at 8:21<span style='font-family:"Arial",sans-serif'> </span>AM Cedric Duprez <<a href="mailto:cedric.duprez@ign.fr">cedric.duprez@ign.fr</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><p class=MsoNormal>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() : 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=<a href="https://cdn.proj.org" target="_blank">https://cdn.proj.org</a> 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<br><br>When I execute this query: <br>SELECT 'POINT EMPTY'::public.geometry = 'POINT EMPTY'::public.geometry;<br>I get the following error:<br>ERROR: operator is not unique: public.geometry = 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></div></div></body></html>