[Feature Request]: Iceberg IO Hash Distribution Mode Support for Spark Based Runners

[barunkumaracharya]

What would you like to happen?

In Beam's latest release 2.74.0, Hash Distribution Mode and AutoSharding for ICEBERG IO WRITES were enabled via this PR 38061.
This PR introduced a new transform WriteToPartitions (file WriteToPartitions.java, new in 2.74.0) and this file uses GroupIntoBatches Transform which is not supported in Spark Runners as Spark Runner does not support @OnWindowExpiration annotation (States and Timers) which is why i m unable to use the new feature in Spark Runner.

When i use SparkStructuredStreamingRunner, the code fails at this line

When i use SparkRunner, the code fails at this line

Is there a workaround or solve for Spark Runner Users to use the "hash" distribution mode with "autoSharding" for Iceberg Writes using Beam.

Issue Priority

Priority: 2 (default / most feature requests should be filed as P2)

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