com.google.cloud.dataflow.sdk.transforms

Class Count

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.Count

public class Count
extends java.lang.Object

Count transforms can be used to count the number of elements in a PCollection. Count.PerElement can be used to count the number of occurrences of each distinct element in the PCollection. Count.Globally can be used to count the total number of elements in a PCollection.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Count.Globally<T> Count.Globally<T> takes a PCollection<T> and returns a PCollection<Long> containing a single element that is the total number of elements in the PCollection.
static class	Count.PerElement<T> Count.PerElement<T> takes a PCollection<T> and returns a PCollection<KV<T, Long>> representing a map from each distinct element of the input PCollection to the number of times that element occurs in the input.

Constructor Summary

Constructors

Constructor and Description
Count()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> Count.Globally<T>	globally() Returns a Count.Globally PTransform that counts the number of elements in its input PCollection.
static <T> Count.PerElement<T>	perElement() Returns a Count.PerElement PTransform that counts the number of occurrences of each element in its input PCollection.

Methods inherited from class java.lang.Object

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

Constructor Detail

Count

public Count()

Method Detail

globally

public static <T> Count.Globally<T> globally()

Returns a Count.Globally PTransform that counts the number of elements in its input PCollection.

See Count.Globally for more details.

perElement

public static <T> Count.PerElement<T> perElement()

Returns a Count.PerElement PTransform that counts the number of occurrences of each element in its input PCollection.

See Count.PerElement for more details.