Github user kai-zeng commented on a diff in the pull request:
https://github.com/apache/spark/pull/4685#discussion_r26779854
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
---
@@ -18,21 +18,28 @@
package org.apache.spark.sql.catalyst.expressions
import org.apache.spark.sql.catalyst.analysis.UnresolvedException
-import org.apache.spark.sql.catalyst.errors.TreeNodeException
import org.apache.spark.sql.types._
case class UnaryMinus(child: Expression) extends UnaryExpression {
type EvaluatedType = Any
+ override lazy val resolved = child.resolved &&
+ (child.dataType.isInstanceOf[NumericType] ||
child.dataType.isInstanceOf[NullType])
--- End diff --
Something like "SELECT null FROM table"
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