Tutorial 3f – Combine Core Transform in Apache Beam смотреть онлайн

github url: https://github.com/vigneshSs-07/Cloud-AI-Analytics/tree/main/Apache%20Beam%20-Python

Combine:
● Combine is a Beam core transform for combining collections of elements or values in your data.
● Combine has variants that work on entire PCollections, and some that combine the values for each key in PCollections of key/value pairs.
● When you apply a Combine transform, you must provide the function that contains the logic for combining the elements or values.
● The combining function should be commutative(mean and division) and associative.
● The Beam SDK also provides some pre-built combine functions for common numeric combination operations such as sum, min, and max.
● complex combination operations might require you to create a subclass of CombineFn that has an accumulation type distinct from the input/output type.

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