Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/4685#discussion_r26900980
--- 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])
+
def dataType = child.dataType
override def foldable = child.foldable
def nullable = child.nullable
override def toString = s"-$child"
- lazy val numeric = dataType match {
- case n: NumericType => n.numeric.asInstanceOf[Numeric[Any]]
- case other => sys.error(s"Type $other does not support numeric
operations")
- }
+ val numeric =
+ if (resolved) {
+ dataType match {
+ case n: NumericType => n.numeric.asInstanceOf[Numeric[Any]]
+ case n: NullType => UnresolvedNumeric
+ }
+ } else {
+ UnresolvedNumeric
+ }
--- End diff --
`UnresolvedNumeric` provides better error message than an NPE.
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