Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/12340#discussion_r59961811 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala --- @@ -487,6 +487,43 @@ case class PrintToStderr(child: Expression) extends UnaryExpression { } /** + * A function throws an exception if 'condition' is not true. + */ +@ExpressionDescription( + usage = "_FUNC_(condition) - Throw an exception if 'condition' is not true (false, 0, null, '').") +case class AssertTrue(child: Expression) extends UnaryExpression { + + override def nullable: Boolean = true + + def dataType: DataType = NullType --- End diff -- override?
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