a new rule is needed: alter index (ATTACH PARTITION)

[polymorphm]

Postgresql since version 11 has an ability: partitioned index postgres .

so we need a new rule for it.. and for begin we need at least a DUMP-example :-) .

It seems that the alter rule for ATTACH PARTITION should be with priority mechanism similar as thing in issue #8 .

PG docs look like:

ALTER TABLE ONLY measurement ADD UNIQUE (city_id, logdate);

ALTER TABLE measurement_y2006m02 ADD UNIQUE (city_id, logdate);
ALTER INDEX measurement_city_id_logdate_key
    ATTACH PARTITION measurement_y2006m02_city_id_logdate_key;
...