Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/10757#discussion_r53012681
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -255,6 +236,19 @@ trait Unevaluable extends Expression {
/**
+ * Expressions that don't have SQL representation should extend this
trait. Examples are
+ * `ScalaUDF`, `ScalaUDAF`, and object expressions like `MapObjects` and
`Invoke`.
+ */
+trait NonSQLExpression extends Expression {
+ override def sql: String = {
--- End diff --
One exception is the `PythonUDF` case mentioned above.
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