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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