ValueAggregator (Pinot local segment implementations 1.1.0 API)

Type Parameters:

R - Type of the raw value (non-aggregated)

A - Type of the aggregated value

All Known Implementing Classes:

AvgValueAggregator, CountValueAggregator, DistinctCountBitmapValueAggregator, DistinctCountCPCSketchValueAggregator, DistinctCountHLLPlusValueAggregator, DistinctCountHLLValueAggregator, DistinctCountThetaSketchValueAggregator, DistinctCountULLValueAggregator, IntegerTupleSketchValueAggregator, MaxValueAggregator, MinMaxRangeValueAggregator, MinValueAggregator, PercentileEstValueAggregator, PercentileTDigestValueAggregator, SumPrecisionValueAggregator, SumValueAggregator
```
public interface ValueAggregator<R,A>
```
A value aggregator that pre-aggregates on the input values for a specific type of aggregation.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`A`	`applyAggregatedValue(A value, A aggregatedValue)`	Applies an aggregated value to the current aggregated value.
`A`	`applyRawValue(A value, R rawValue)`	Applies a raw value to the current aggregated value.
`A`	`cloneAggregatedValue(A value)`	Clones an aggregated value.
`A`	`deserializeAggregatedValue(byte[] bytes)`	De-serializes an aggregated value from a byte array.
`FieldSpec.DataType`	`getAggregatedValueType()`	Returns the data type of the aggregated value.
`AggregationFunctionType`	`getAggregationType()`	Returns the type of the aggregation.
`A`	`getInitialAggregatedValue(R rawValue)`	Returns the initial aggregated value.
`int`	`getMaxAggregatedValueByteSize()`	Returns the maximum size in bytes of the aggregated values seen so far.
`byte[]`	`serializeAggregatedValue(A value)`	Serializes an aggregated value into a byte array.

- Method Detail
  - getAggregationType
```
AggregationFunctionType getAggregationType()
```
    Returns the type of the aggregation.
  - getAggregatedValueType
```
FieldSpec.DataType getAggregatedValueType()
```
    Returns the data type of the aggregated value.
  - getInitialAggregatedValue
```
A getInitialAggregatedValue(R rawValue)
```
    Returns the initial aggregated value.
  - applyRawValue
```
A applyRawValue(A value,
                R rawValue)
```
    Applies a raw value to the current aggregated value.
    NOTE: if value is mutable, will directly modify the value.
  - applyAggregatedValue
```
A applyAggregatedValue(A value,
                       A aggregatedValue)
```
    Applies an aggregated value to the current aggregated value.
    NOTE: if value is mutable, will directly modify the value.
  - cloneAggregatedValue
```
A cloneAggregatedValue(A value)
```
    Clones an aggregated value.
  - getMaxAggregatedValueByteSize
```
int getMaxAggregatedValueByteSize()
```
    Returns the maximum size in bytes of the aggregated values seen so far.
  - serializeAggregatedValue
```
byte[] serializeAggregatedValue(A value)
```
    Serializes an aggregated value into a byte array.
  - deserializeAggregatedValue
```
A deserializeAggregatedValue(byte[] bytes)
```
    De-serializes an aggregated value from a byte array.