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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2115) TableAPI throws ExpressionException for "Dangling GroupBy operation"
Date Thu, 19 Nov 2015 09:17:10 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15013200#comment-15013200
] 

ASF GitHub Bot commented on FLINK-2115:
---------------------------------------

Github user aljoscha commented on the pull request:

    https://github.com/apache/flink/pull/1377#issuecomment-157997049
  
    OK, I see your point. We can go with the MySQL way then. Thanks for explaining it. :smile:

    
    Could you please update the documentation with a small paragraph that explains the behavior?


> 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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