| Class | Description |
|---|---|
| Aggregator<IN,BUF,OUT> |
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. |
| MutableAggregationBuffer |
A
Row representing a mutable aggregation buffer. |
| UserDefinedAggregateFunction |
The base class for implementing user-defined aggregate functions (UDAF).
|
| UserDefinedFunction |
A user-defined function.
|
| Window |
Utility functions for defining window in DataFrames.
|
| WindowSpec |
A window specification that defines the partitioning, ordering, and frame boundaries.
|