kazuyukitanimura commented on a change in pull request #33930:
URL: https://github.com/apache/spark/pull/33930#discussion_r721796559
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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@@ -813,6 +860,37 @@ object NullPropagation extends Rule[LogicalPlan] {
}
+/**
+ * Unwrap the input of IsNull/IsNotNull if the input is NullIntolerant
+ * E.g. IsNull(Not(null)) == IsNull(null)
+ */
+object NullDownPropagation extends Rule[LogicalPlan] {
+ // Not all NullIntolerant can be propagated
+ // Return false if the expression may return null without non-null inputs.
+ // E.g. Cast is NullIntolerant; however, cast('Infinity' as integer) returns
true
+ // Cannot apply to `ExtractValue` as the query planner uses the trait to
resolve the columns.
+ // E.g. the planner may resolve column `a` to `a#123`, then IsNull(a#123)
cannot be optimized
+ // Cannot apply to `EqualTo` as applying this optimization is too disruptive
for some tests.
+ // E.g. [SPARK-32290]
+ private def supportedNullIntolerant(e: NullIntolerant): Boolean = (e match {
+ case _: Not => true
+ case _: GreaterThan | _: GreaterThanOrEqual | _: LessThan | _:
LessThanOrEqual => true
Review comment:
Thank you. Good point. Updated!
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