expressions

Type Members

1. abstract class Aggregator[-I, B, O] extends Serializable

   A base class for user-defined aggregations, which can be used in DataFrame and Dataset operations to take all of the elements of a group and reduce them to a single value.

2. abstract class MutableAggregationBuffer extends Row

   :: Experimental :: A Row representing an mutable aggregation buffer.

3. abstract class UserDefinedAggregateFunction extends Serializable

   :: Experimental :: The base class for implementing user-defined aggregate functions (UDAF).

4. class Window extends AnyRef

   :: Experimental :: Utility functions for defining window in DataFrames.

5. class WindowSpec extends AnyRef

   :: Experimental :: A window specification that defines the partitioning, ordering, and frame boundaries.