[datafusion-spark]: Implement collect_set #17924
Description
Is your feature request related to a problem or challenge?
Implement collect_set equivalent of spark.
Note that, Spark doc explicitly mentions this for collect_set - The function is non-deterministic because the order of collected results depends on the order of the rows which may be non-deterministic after a shuffle., link.
Describe the solution you'd like
No response
Describe alternatives you've considered
No response
Additional context
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