[word=the] | [□=□]
[word=the] | [word=□]
These operators must be named ' <' and '> ' ; you do not have any choice in the matter , since there is no provision for specifying them explicitly . However , this second option is possible only if explicitly enabled during the Postgres installation . There must be ' <' and '> ' ordering operators having the same left and right input datatypes as the mergejoinable operator itself .