The input table must contain the columns described in the following table. The input table can have additional columns, but the function ignores them.
|Column Name||Data Type||Description|
|id_column||Any||Column containing the IDs to be clustered (that is, the set of users).|
|items_column||BIGINT, INTEGER, HEX, or STRING||Column containing the set of items on which the clustering is based (that is, the set of items that each user purchased).|