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Apache Spark What is the difference between requiredChildDistribution and outputPartitioning?

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In Apache Spark, each physical operator in the physical plan has 4 properties:

  • outputPartitioning
  • outputOrdering​
  • requiredChildDistribution
  • requiredChildOrdering

But aren't outputPartioning and requiredChildDistribution the same? How are they different and what do they fundamentally represent? Same for outputOrdering and requiredChildOrdering?

scala apache-spark apache-spark-sql hdfs catalyst-optimizer
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