ValueSummaryAggregator (Flink : Java 1.18.1-cp2 API)

java.lang.Object
- org.apache.flink.api.java.summarize.aggregation.ValueSummaryAggregator<VT,PT,R,A>

Type Parameters:

VT - the "Value Type" to aggregate, e.g. DoubleValue, StringValue

PT - the "Primitive Type" that "Value Type" can be naturally converted to, e.g. DoubleValue converts to Double

R - the result type of the aggregation, e.g. NumericColumnSummary<Double>

A - the underlying primitive Aggregator that does the actual work, e.g. DoubleSummaryAggregator

All Implemented Interfaces:

Serializable, Aggregator<VT,R>

Direct Known Subclasses:

ValueSummaryAggregator.BooleanValueSummaryAggregator, ValueSummaryAggregator.DoubleValueSummaryAggregator, ValueSummaryAggregator.FloatValueSummaryAggregator, ValueSummaryAggregator.IntegerValueSummaryAggregator, ValueSummaryAggregator.LongValueSummaryAggregator, ValueSummaryAggregator.ShortValueSummaryAggregator, ValueSummaryAggregator.StringValueSummaryAggregator
```
@Internal
public abstract class ValueSummaryAggregator<VT extends org.apache.flink.types.Value,PT,R,A extends Aggregator<PT,R>>
extends Object
implements Aggregator<VT,R>
```
This is a generic Aggregator for Value types like StringValue, DoubleValue, etc. This class makes it easy to re-use the implementation of another aggregator.

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`ValueSummaryAggregator.BooleanValueSummaryAggregator`	A `ValueSummaryAggregator` for `Boolean`.
`static class`	`ValueSummaryAggregator.DoubleValueSummaryAggregator`	A `ValueSummaryAggregator` for `Double`.
`static class`	`ValueSummaryAggregator.FloatValueSummaryAggregator`	A `ValueSummaryAggregator` for `Float`.
`static class`	`ValueSummaryAggregator.IntegerValueSummaryAggregator`	A `ValueSummaryAggregator` for `Integer`.
`static class`	`ValueSummaryAggregator.LongValueSummaryAggregator`	A `ValueSummaryAggregator` for `Long`.
`static class`	`ValueSummaryAggregator.ShortValueSummaryAggregator`	A `ValueSummaryAggregator` for `Short`.
`static class`	`ValueSummaryAggregator.StringValueSummaryAggregator`	A `ValueSummaryAggregator` for `String`.

Constructor Summary

Constructors
Constructor Description

ValueSummaryAggregator()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`aggregate(VT value)`	Add a value to the current aggregation.
`void`	`combine(Aggregator<VT,R> otherSameType)`	Combine two aggregations of the same type.
`protected abstract PT`	`getValue(VT value)`	Get the value out of a value type.
`protected abstract A`	`initPrimitiveAggregator()`	Initialize an aggregator that can be used for the underlying primitive in the Value type.
`R`	`result()`	Provide the final result of the aggregation.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ValueSummaryAggregator
```
public ValueSummaryAggregator()
```
- Method Detail
  - aggregate
```
public void aggregate(VT value)
```
    Description copied from interface: Aggregator
    
    Add a value to the current aggregation.
    
    Specified by:
    
    aggregate in interface Aggregator<VT extends org.apache.flink.types.Value,PT>
  - combine
```
public void combine(Aggregator<VT,R> otherSameType)
```
    Description copied from interface: Aggregator
    
    Combine two aggregations of the same type.
    (Implementations will need to do an unchecked cast).
    
    Specified by:
    
    combine in interface Aggregator<VT extends org.apache.flink.types.Value,PT>
  - result
```
public R result()
```
    Description copied from interface: Aggregator
    
    Provide the final result of the aggregation.
    
    Specified by:
    
    result in interface Aggregator<VT extends org.apache.flink.types.Value,PT>
  - initPrimitiveAggregator
```
protected abstract A initPrimitiveAggregator()
```
    Initialize an aggregator that can be used for the underlying primitive in the Value type.
    E.g. DoubleValues can easily be converted to Double and could use an underlying Aggregator<Double,?>
  - getValue
```
protected abstract PT getValue(VT value)
```
    Get the value out of a value type.