org.apache.flink.api.java.summarize.aggregation

类 ValueSummaryAggregator<VT extends org.apache.flink.types.Value,PT,R,A extends Aggregator<PT,R>>

java.lang.Object

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

类型参数:

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

所有已实现的接口:

Serializable, Aggregator<VT,R>

直接已知子类:

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.

另请参阅:

序列化表格

嵌套类概要

嵌套类

限定符和类型	类和说明
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.

构造器概要

构造器

构造器和说明
ValueSummaryAggregator()

方法概要

限定符和类型	方法和说明
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.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

ValueSummaryAggregator

public ValueSummaryAggregator()

方法详细资料

aggregate

public void aggregate(VT value)

从接口复制的说明: Aggregator

Add a value to the current aggregation.

指定者:

aggregate 在接口中 Aggregator<VT extends org.apache.flink.types.Value,R>

combine

public void combine(Aggregator<VT,R> otherSameType)

从接口复制的说明: Aggregator

Combine two aggregations of the same type.

(Implementations will need to do an unchecked cast).

指定者:

combine 在接口中 Aggregator<VT extends org.apache.flink.types.Value,R>

result

public R result()

从接口复制的说明: Aggregator

Provide the final result of the aggregation.

指定者:

result 在接口中 Aggregator<VT extends org.apache.flink.types.Value,R>

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.