I'm using Spark 2.0.

I've created a dataset from a parquet file and repartition on one of the 
columns (docId) and persist the repartitioned dataset.

val om = ds.repartition($"docId").persist(StorageLevel.MEMORY_AND_DISK)

When I try to confirm the partitioner, with


I get

Option[org.apache.spark.Partitioner] = None

I would have thought it would be HashPartitioner.

Does anyone know why this would be None and not HashPartitioner?



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