Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/8983#discussion_r41188938 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala --- @@ -305,12 +305,17 @@ object HiveTypeCoercion { /** * Convert all expressions in in() list to the left operator type + * except when the left operator type is NullType. In case when left hand + * operator type is NullType create a Literal(Null). */ object InConversion extends Rule[LogicalPlan] { def apply(plan: LogicalPlan): LogicalPlan = plan resolveExpressions { // Skip nodes who's children have not been resolved yet. case e if !e.childrenResolved => e + case i @ In(a, b) if (a.dataType == NullType) => + Literal.create(null, BooleanType) --- End diff -- instead of just casting null to boolean, can we come up with a better idea according to the data types of `b`?
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