Inherited from UnaryExecNode
Inherited from SparkPlan
Inherited from Serializable
Inherited from Serializable
Inherited from internal.Logging
Inherited from QueryPlan[SparkPlan]
Inherited from TreeNode[SparkPlan]
Inherited from Product
Inherited from Equals
Inherited from AnyRef
Inherited from Any
Special plan to collect top-level aggregation on driver itself and avoid an exchange for simple aggregates.