Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/9409#discussion_r44210935
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -419,3 +419,30 @@ case class Greatest(children: Seq[Expression]) extends
Expression {
"""
}
}
+
+/** Operator that drops a row when it contains any nulls. */
+case class DropAnyNull(child: Expression) extends UnaryExpression {
+ override def nullable: Boolean = true
+ override def dataType: DataType = child.dataType
+
+ protected override def nullSafeEval(input: Any): InternalRow = {
+ val row = input.asInstanceOf[InternalRow]
--- End diff --
So it turns out this is actually correct. The ```eval``` method of
```UnaryExpression``` will call ```eval``` on the ```child``` expression and
pass the result on the ```nullSafeEval``` method if it's not null.
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