Swinky commented on a change in pull request #34062:
URL: https://github.com/apache/spark/pull/34062#discussion_r714823618
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/dynamicpruning/PartitionPruning.scala
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@@ -201,26 +201,46 @@ object PartitionPruning extends Rule[LogicalPlan] with
PredicateHelper with Join
}
/**
- * Returns whether an expression is likely to be selective
+ * Returns whether an expression is likely to be selective in dynamic
partition filtering.
+ * 1. the predicate is selective.
+ * 2. the filtering predicate must not be subset of join key. In case it is,
key then partition
+ * filter. can be inferred statically in optimization phase, hence return
false.
Review comment:
corrected
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