Produces a collection containing distinct elements of the input collection.
On some data sets, it might be more efficient to compute an approximate
ApproximateUnique, which also allows for determining distinct
values for each key.
See BEAM-7703 for updates.
- Count counts the number of elements within each aggregation.
- ApproximateUnique estimates the number of distinct elements in a collection.
Last updated on 2020/08/14
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