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From twalthr <...@git.apache.org>
Subject [GitHub] flink pull request #3026: [FLINK-2980] [table] Support for GROUPING SETS cla...
Date Mon, 23 Jan 2017 14:13:14 GMT
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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