org.postgresql.util.PSQLException: ERROR: could not identify an equality operator for type xml

Hi All,

I have added one column with xml type ,after adding I am getting following
error.

org.postgresql.util.PSQLException: ERROR: could not identify an equality
operator for type xml

If I have removed column following query works fine

select * from (select * from KM_COURSE_MAST where ID in (select OBJ_ID from
(select OBJ_ID,PERFORMER_TYPE,PERFORMER_ID from KM_REL_OBJ_PER_ACTION
where OBJ_TYPE='COURSETYPE') g where PERFORMER_TYPE='GROUP' and
PERFORMER_ID in ((WITH RECURSIVE parents as ( select PARENT_ID from
KM_REL_SELF_GROUP where CHILD_ID in ( SELECT GROUP_ID FROM KM_REL_GRP_USER
WHERE USER_ID=46467) UNION select a.PARENT_ID FROM KM_REL_SELF_GROUP a
,parents p where a.CHILD_ID = p.PARENT_ID ) select PARENT_ID from parents
order by PARENT_ID asc)union SELECT GROUP_ID FROM KM_REL_GRP_USER WHERE
USER_ID=46467)) union select * from KM_COURSE_MAST where
CREATED_BY='46467') KM_COURSE_MAST order by DISPLAYORDER

Thanks,
Gajendra