说明
支持内核:Presto、SparkSQL。
适用表范围:原生 Iceberg 表、外部表。
用途:为数据表新增单个分区字段。
标准语法
ALTER TABLE table_name ADD PARTITION partition_column | hidden_partition_spec [AS alias]hidden_partition_spec:Supported transformations are:years(ts): partition by yearmonths(ts): partition by monthdays(ts) or date(ts): equivalent to dateint partitioninghours(ts) or date_hour(ts): equivalent to dateint and hour partitioningbucket(N, col): partition by hashed value mod N bucketstruncate(L, col): partition by value truncated to LStrings are truncated to the given lengthIntegers and longs truncate to bins: truncate(10, i) produces partitions 0, 10, 20, 30, …
参数说明
table_name
:需要的表名字。partition_column
: 分区列。alias
: 分区列增加的别名。示例
ALTER TABLE prod.db.sample ADD PARTITION FIELD bucket(16, id)ALTER TABLE prod.db.sample ADD PARTITION FIELD truncate(data, 4)ALTER TABLE prod.db.sample ADD PARTITION FIELD years(ts)-- use optional AS keyword to specify a custom name for the partition fieldALTER TABLE prod.db.sample ADD PARTITION FIELD bucket(16, id) AS shard