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https://issues.apache.org/jira/browse/FLINK-2115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15035340#comment-15035340
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ASF GitHub Bot commented on FLINK-2115:
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Github user ChengXiangLi commented on the pull request:
https://github.com/apache/flink/pull/1377#issuecomment-161190371
Hi, @aljoscha , i guess you may forget this PR :smile: , could you help to
move this forward? it should be ready yet.
> 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
> Assignee: Chengxiang Li
>
> 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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