ImperativeAggregate — Contract for Aggregate Function Expressions with Imperative Methods

ImperativeAggregate is the contract for aggregate functions that are expressed in terms of imperative initialize, update, and merge methods (that operate on Row-based aggregation buffers).

ImperativeAggregate is a Catalyst expression with CodegenFallback.

Table 1. ImperativeAggregate’s Direct Implementations
Name Description

HyperLogLogPlusPlus

PivotFirst

ScalaUDAF

TypedImperativeAggregate

ImperativeAggregate Contract

package org.apache.spark.sql.catalyst.expressions.aggregate

abstract class ImperativeAggregate {
  def initialize(mutableAggBuffer: InternalRow): Unit
  val inputAggBufferOffset: Int
  def merge(mutableAggBuffer: InternalRow, inputAggBuffer: InternalRow): Unit
  val mutableAggBufferOffset: Int
  def update(mutableAggBuffer: InternalRow, inputRow: InternalRow): Unit
  def withNewInputAggBufferOffset(newInputAggBufferOffset: Int): ImperativeAggregate
  def withNewMutableAggBufferOffset(newMutableAggBufferOffset: Int): ImperativeAggregate
}
Table 2. ImperativeAggregate Contract (in alphabetical order)
Method Description

initialize

Used when:

inputAggBufferOffset

merge

Used when:

mutableAggBufferOffset

update

Used when:

withNewInputAggBufferOffset

withNewMutableAggBufferOffset

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