org.apache.flink.table.runtime.operators.aggregate

类 RecordCounter

java.lang.Object

org.apache.flink.table.runtime.operators.aggregate.RecordCounter

所有已实现的接口:

Serializable

public abstract class RecordCounter
extends Object
implements Serializable

The RecordCounter is used to count the number of input records under the current key.

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
RecordCounter()

方法概要

限定符和类型	方法和说明
static RecordCounter	of(int indexOfCountStar) Creates a RecordCounter depends on the index of count(*).

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

RecordCounter

public RecordCounter()

方法详细资料

of

public static RecordCounter of(int indexOfCountStar)

Creates a RecordCounter depends on the index of count(*). If index is less than zero, returns AccumulationRecordCounter, otherwise, RetractionRecordCounter.

参数:

indexOfCountStar - The index of COUNT(*) in the aggregates. -1 when the input doesn't contain COUNT(*), i.e. doesn't contain retraction messages. We make sure there is a COUNT(*) if input stream contains retraction.