maropu commented on a change in pull request #23783: [SPARK-26854][SQL] Support
ANY/SOME subquery
URL: https://github.com/apache/spark/pull/23783#discussion_r257505242
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
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@@ -798,3 +901,11 @@ case class GreaterThanOrEqual(left: Expression, right:
Expression)
protected override def nullSafeEval(input1: Any, input2: Any): Any =
ordering.gteq(input1, input2)
}
+
+/**
+ * Only be used in PredicateSubquery, and will be rewrite as Not(EqualTo(left,
right)).
+ */
+case class NotEqualTo(left: Expression, right: Expression) extends
BinaryComparison {
Review comment:
We don't like this. Could you look for another approach?
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