Platforms: WhereOS, Spark, Hive Class: com.whereos.udf.IsochroneDistancePolygonsUDTF More functions can be added to WhereOS via Python

isnotnull(expr) – Returns true if `expr` is not null, or false otherwise. Platforms: WhereOS, Spark,

isnull(expr) – Returns true if `expr` is null, or false otherwise. Platforms: WhereOS, Spark, Hive

is_infinite(x) – Determine if x is infinite. Platforms: WhereOS, Spark, Hive Class: hivemall.tools.math.IsInfiniteUDF More functions

is_nan(x) – Determine if x is not-a-number. Platforms: WhereOS, Spark, Hive Class: hivemall.tools.math.IsNanUDF More functions

is_stopword(string word) – Returns whether English stopword or not Platforms: WhereOS, Spark, Hive Class: hivemall.tools.text.StopwordUDF