[GitHub] [spark] c21 commented on pull request #35552: [SPARK-38237][SQL][SS] Rename back StatefulOpClusteredDistribution to HashClusteredDistribution

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c21 commented on pull request #35552:
URL: https://github.com/apache/spark/pull/35552#issuecomment-1043249947


   Second to @sunchao and @viirya, would love a more elaborated explanation for motivation. btw I think we discussed this before that `HashPartitioning` with subset of grouping keys satisfying `ClusteredDistribution`, can be a tradeoff. On one hand, it can be bad because it may cause data skew if the cardinality of subset of keys are not big enough. On the other hand, it can be good because it can help avoid the shuffle before join/group-by/etc. Even if we want to change an existing non-stateful operator, or for a new operator to use `HashClusteredDistribution` than `ClusteredDistribution`, we still need to discuss the tradeoff in depth. 


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