UDF

udf.UserDefinedFunction.asNondeterministic()	Updates UserDefinedFunction to nondeterministic.
udf.UserDefinedFunction.returnType
UDFRegistration.register(name, f[, returnType])	Register a Python function (including lambda function) or a user-defined function as a SQL function.
UDFRegistration.registerJavaFunction(name, …)	Register a Java user-defined function as a SQL function.
UDFRegistration.registerJavaUDAF(name, …)	Register a Java user-defined aggregate function as a SQL function.

pyspark.sql.Observation.get pyspark.sql.udf.UserDefinedFunction.asNondeterministic