The following bug has been logged on the website:
Bug reference: 6401
Logged by: Kenaniah Cerny
Email address: kenaniah@gmail.com
PostgreSQL version: 9.1.2
Operating system: Centos 6 x86_64
Description:=20=20=20=20=20=20=20=20
----
SELECT point(2, 3) IS DISTINCT FROM point(2, 3);
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ERROR: operator does not exist: point =3D point
LINE 1: SELECT point(2, 3) IS DISTINCT FROM point(2, 3)
^
HINT: No operator matches the given name and argument type(s). You might
need to add explicit type casts.
----
According to the docs
(http://www.postgresql.org/docs/current/static/functions-geometry.html#FUNC=
TIONS-GEOMETRY),
the "same as" operator is the ~=3D operator, not the =3D operator.=20
This problem cascades to the comparison of complex types, such as "OLD IS
DISTINCT FROM NEW" in the context of plpgsql.=20
