Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/3026#discussion_r97312088
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/Expression.scala
---
@@ -86,3 +85,44 @@ abstract class UnaryExpression extends Expression {
abstract class LeafExpression extends Expression {
private[flink] val children = Nil
}
+
+class GroupedExpression(
+ private[flink] val children: Seq[Expression]
+ ) extends Expression {
+
+ def this(product: Product) {
+ this(
+ product.productIterator
+ .map {
+ case e: Expression => e
+ case s: Symbol => UnresolvedFieldReference(s.name)
+ case p: Product => new GroupedExpression(p)
+ case _ => throw new IllegalArgumentException()
--- End diff --
Please throw an `TableException` here and give a meaningful message.
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