[jira] [Created] (FLINK-2115) TableAPI throws ExpressionException for "Dangling GroupBy operation"

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-2115:
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             Summary: TableAPI throws ExpressionException for "Dangling GroupBy operation"
                 Key: FLINK-2115
                 URL: https://issues.apache.org/jira/browse/FLINK-2115
             Project: Flink
          Issue Type: Bug
          Components: Table API
    Affects Versions: 0.9
            Reporter: Fabian Hueske


The following program below throws an ExpressionException due to a "Dangling GroupBy operation".
However, I think the program is semantically correct and should execute.

{code}
public static void main(String[] args) throws Exception {

  ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

  DataSet<Integer> data = env.fromElements(1,2,2,3,3,3,4,4,4,4);
  DataSet<Tuple2<Integer, Integer>> tuples = data
      .map(new MapFunction<Integer, Tuple2<Integer, Integer>>() {
        @Override
        public Tuple2<Integer, Integer> map(Integer i) throws Exception {
          return new Tuple2<Integer, Integer>(i, i*2);
        }
      });

  TableEnvironment tEnv = new TableEnvironment();
  Table t = tEnv.toTable(tuples).as("i, i2")
      .groupBy("i, i2").select("i, i2")
      .groupBy("i").select("i, i.count as cnt");

  tEnv.toSet(t, Row.class).print();
}
{code}



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