我需要有与此exclusion
约束等效的东西
drop table if exists t;
create table t (
i int,
tsr tstzrange,
exclude using gist (i with =, tsr with &&)
);
ERROR: data type integer has no default operator class for access method "gist"
HINT: You must specify an operator class for the index or define a default operator class for the data type.
我猜这个问题从错误消息中很明显。怎么做?