[GitHub] [spark] cloud-fan commented on a change in pull request #34070: [SPARK-36840][SQL] Support DPP if there is no selective predicate on the filtering side

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cloud-fan commented on a change in pull request #34070:
URL: https://github.com/apache/spark/pull/34070#discussion_r716487286



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File path: sql/core/src/main/scala/org/apache/spark/sql/execution/dynamicpruning/PartitionPruning.scala
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@@ -225,16 +230,6 @@ object PartitionPruning extends Rule[LogicalPlan] with PredicateHelper with Join
     }.isDefined
   }
 
-  /**
-   * To be able to prune partitions on a join key, the filtering side needs to
-   * meet the following requirements:
-   *   (1) it can not be a stream
-   *   (2) it needs to contain a selective predicate used for filtering

Review comment:
       IIUC, the eventual goal is to make sure the "filtering side" is small. How do you guarantee it without selective predicates?




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