Github user jaceklaskowski commented on a diff in the pull request: https://github.com/apache/spark/pull/14435#discussion_r73332573 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala --- @@ -53,6 +53,40 @@ case class Project(projectList: Seq[NamedExpression], child: LogicalPlan) extend override def validConstraints: Set[Expression] = child.constraints.union(getAliasedConstraints(projectList)) + + override def sql: String = { + if (projectList.exists(expr => expr.find(e => e.isInstanceOf[NonSQLExpression]).isDefined)) { + throw new UnsupportedOperationException("NonSQLExpression") --- End diff -- Would `assert` be applicable here?
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