ALTER TABLE table_name ADD PARTITION partition_column | hidden_partition_spec

hidden_partition_spec:
    Supported transformations are:
        years(ts): partition by year
        months(ts): partition by month
        days(ts) or date(ts): equivalent to dateint partitioning
        hours(ts) or date_hour(ts): equivalent to dateint and hour partitioning
        bucket(N, col): partition by hashed value mod N buckets
        truncate(L, col): partition by value truncated to L
            Strings are truncated to the given length
            Integers and longs truncate to bins: truncate(10, i) produces partitions 0, 10, 20, 30, …

ALTER TABLE prod.db.sample DROP PARTITION FIELD catalog
ALTER TABLE prod.db.sample DROP PARTITION FIELD bucket(16, id)
ALTER TABLE prod.db.sample DROP PARTITION FIELD truncate(data, 4)
ALTER TABLE prod.db.sample DROP PARTITION FIELD years(ts)
ALTER TABLE prod.db.sample DROP PARTITION FIELD shard