tanelk commented on a change in pull request #28642:
URL: https://github.com/apache/spark/pull/28642#discussion_r738038077
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -1215,6 +1215,14 @@ object InferFiltersFromConstraints extends
Rule[LogicalPlan]
}
}
+ // Whether the result of this expression may be null. For example:
CAST(strCol AS double)
+ // We will infer an IsNotNull expression for this expression to avoid skew
join.
+ private def resultMayBeNull(exp: Expression): Boolean = exp match {
Review comment:
perhaps also check the nullability of exp
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