Example on SideInput #35935

[ankitkumarrain]

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[gemini-code-assist[bot]]

Summary of Changes

Hello @ankitkumarrain, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request adds a practical example to the Apache Beam Python SDK that illustrates how to implement a slowly updating side input. This pattern is valuable for pipelines that need to incorporate external data that changes infrequently, ensuring the main processing logic always has access to the most current information without constant re-evaluation. The new snippet provides a clear demonstration of combining periodic impulses with windowing and combiners to achieve this common data processing requirement.

Highlights

• New SideInput Example: Introduced a new Python snippet demonstrating a 'SlowUpdate' SideInput pattern within Apache Beam's examples.
• Periodic Data Generation: The example utilizes PeriodicImpulse to generate a stream of data for the side input, simulating infrequent updates.
• Latest Element Retrieval: It showcases the use of Latest.Globally() to efficiently retrieve the most recent element from the periodically updated side input.

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