acos(expr) – Returns the inverse cosine (a.k.a. arc cosine) of `expr`, as if computed by `java.lang.Math.acos`.
Platforms: WhereOS, Spark, Hive
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.