Count
Counts the number of elements within each aggregation. The Count
transform has three varieties:
Count.globally()
counts the number of elements in the entirePCollection
. The result is a collection with a single element.Count.perKey()
counts how many elements are associated with each key. It ignores the values. The resulting collection has one output for every key in the input collection.Count.perElement()
counts how many times each element appears in the input collection. The output collection is a key-value pair, containing each unique element and the number of times it appeared in the original collection.
Examples
Example 1: Count.globally
Example 2: Count.perKey
Related transforms
- ApproximateUnique estimates the number of distinct elements or distinct values in key-value pairs
- Sum computes the sum of elements in a collection
Last updated on 2024/11/14
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