sealed trait Distribution extends AnyRef
Specifies how tuples that share common expressions will be distributed when a query is executed in parallel on many machines.
Distribution here refers to inter-node partitioning of data. That is, it describes how tuples are partitioned across physical machines in a cluster. Knowing this property allows some operators (e.g., Aggregate) to perform partition local operations instead of global ones.
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- abstract def createPartitioning(numPartitions: Int): Partitioning
Creates a default partitioning for this distribution, which can satisfy this distribution while matching the given number of partitions.
- abstract def requiredNumPartitions: Option[Int]
The required number of partitions for this distribution.
The required number of partitions for this distribution. If it's None, then any number of partitions is allowed for this distribution.
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