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RepartitionExec batch coalescer size is only controllable via session config #25174

Description

@Rich-T-kid

Is your feature request related to a problem or challenge?

There is no way to set the target batch size for RepartitionExec's output coalescer on a per-node basis. The coalescer always reads SessionConfig::batch_size, so callers who want a different batch size for a specific repartition step must change the global session config, which affects all operators. A with_batch_size builder method would allow per-node override without touching the session.

Describe the solution you'd like

have a field on RepartitionExec's that allows the coalescer to be fine tuned

Describe alternatives you've considered

No response

Additional context

No response

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