:: Experimental ::
A base class for user-defined aggregations, which can be used in
Dataset operations to take
all of the elements of a group and reduce them to a single value.
The input type for the aggregation.
The type of the intermediate value of the reduction.
The type of the final output result.
Row representing a mutable aggregation buffer.
The base class for implementing user-defined aggregate functions (UDAF).
A user-defined function.
Utility functions for defining window in DataFrames.
A window specification that defines the partitioning, ordering, and frame boundaries.