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Add support of rand() expression  #1198

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@akupchinskiy

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@akupchinskiy

What is the problem the feature request solves?

Native-comet implementation of spark rand() function.

Describe the potential solution

No response

Additional context

Vanilla-spark implementation relies on the partition awareness, so the comet planner also needs to be made partition-aware. That property can be reused for other partition-aware-expressions like spark_partition_id.

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