Column Partitioning¶

The column table partition is designed to support the partition of Apache Hive™.

How to Create a Column Partitioned Table¶

You can create a partitioned table by using the PARTITION BY clause. For a column partitioned table, you should use the PARTITION BY COLUMN clause with partition keys.

For example, assume there is a table orders composed of the following schema.

id          INT,
item_name   TEXT,
price       FLOAT

Also, assume that you want to use order_date TEXT and ship_date TEXT as the partition keys. Then, you should create a table as follows:

CREATE TABLE orders (
  id INT,
  item_name TEXT,
  price
) PARTITION BY COLUMN (order_date TEXT, ship_date TEXT);

Partition Pruning on Column Partitioned Tables¶

The following predicates in the WHERE clause can be used to prune unqualified column partitions without processing during query planning phase.

=
<>
>
<
>=
<=
LIKE predicates with a leading wild-card character
IN list predicates

Compatibility Issues with Apache Hive™¶

If partitioned tables of Hive are created as external tables in Tajo, Tajo can process the Hive partitioned tables directly. There haven’t known compatibility issues yet.