dimsum_mapper(array row, map colNorms [, const string options]) – Returns column-wise partial similarities
Platforms: WhereOS, Spark, Hive
Class: hivemall.knn.similarity.DIMSUMMapperUDTF
More functions can be added to WhereOS via Python or R bindings or as Java & Scala UDF (user-defined function), UDAF (user-defined aggregation function) and UDTF (user-defined table generating function) extensions. Custom libraries can be added on via Settings-page or installed from WhereOS Store.