Old versions of opclass parameters patch supported ability to specify DEFAULT
as the opclass name in CREATE INDEX command. This ability was removed in the
final version, but
911e702077 still mentions that in the documentation.
CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF NOT EXISTS ] name ] ON [ ONLY ] table_name [ USING method ]
- ( { column_name | ( expression ) } [ COLLATE collation ] { opclass | DEFAULT } [ ( opclass_parameter = value [, ... ] ) ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ] [, ...] )
+ ( { column_name | ( expression ) } [ COLLATE collation ] [ opclass [ ( opclass_parameter = value [, ... ] ) ] ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ] [, ...] )
[ INCLUDE ( column_name [, ...] ) ]
[ WITH ( storage_parameter = value [, ... ] ) ]
[ TABLESPACE tablespace_name ]