创建唯一索引

teledb=# create unique index t_as_id_uidx on t_as using btree(id);
CREATE INDEX

非shard key 字段不能建立唯一索引

teledb=# create unique index t_as_id_uidx on t_as using btree(mc);
ERROR:  Unique index of partitioned table must contain the hash/modulo distribution column.