Partition evolution feature

Partition evolution means you can change the partition layout of the table without rewriting existing data files. Old data files can remain partitioned by the old partition layout, while newly added data files are partitioned based on the new layout.

You can use the ALTER TABLE SET PARTITION SPEC statement to change the partition layout of an Iceberg table. A change to the partition spec results in a new metadata.json and a commit, but does not create a new snapshot.

The VOID transform might be used to replace the transform in an existing partition field so that the field is effectively dropped in v1 tables.

ALTER TABLE table_name SET PARTITION SPEC ([col_name][, spec(value)][, spec(value)]...)]

ALTER TABLE t 
SET PARTITION SPEC ( TRUNCATE(5, level), HOUR(event_time), 
BUCKET(15, message), price);

ALTER TABLE ice_p
SET PARTITION SPEC (VOID(i), VOID(d), TRUNCATE(3, s), HOUR(t), i);