Add batch Iceberg AddFiles yaml IT

[ahmedabu98]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request addresses a potential issue in the Iceberg 'AddFiles' transform by ensuring the Iceberg table is properly initialized within the '@ProcessElement' method, making it more robust against serialization or state-related problems. Additionally, it introduces a comprehensive YAML integration test to verify the correct behavior of batch Iceberg 'AddFiles' operations, enhancing test coverage and stability.

Highlights

• Iceberg AddFiles Initialization Fix: Relocated the 'table' initialization logic within the 'CommitFilesDoFn' from the '@StartBundle' method to the '@ProcessElement' method. This ensures the table is loaded correctly for each element, preventing potential null pointer exceptions in certain execution environments.
• New Batch Iceberg AddFiles YAML IT: Introduced a new YAML-based integration test to validate the functionality of batch 'IcebergAddFiles'. This test pipeline writes dummy Parquet files, registers them with an Iceberg table, and then verifies the contents by reading from the Iceberg table.

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R: @damccorm for label python.
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