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https://issues.apache.org/jira/browse/FLINK-2115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15010977#comment-15010977
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ASF GitHub Bot commented on FLINK-2115:
---------------------------------------
GitHub user ChengXiangLi opened a pull request:
https://github.com/apache/flink/pull/1377
[FLINK-2115] [Table API] support no aggregation after groupBy.
`JavaBatchTranslator` does not support no aggregation `select` after
`groupBy` previously, add the logic in this PR.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ChengXiangLi/flink flink-2115
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1377.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1377
----
commit 461f60ceb5e07ca192451c07813a405b83470acc
Author: chengxiang li <[email protected]>
Date: 2015-11-18T11:02:11Z
[FLINK-2115] [Table API] support no aggregation after groupBy.
----
> 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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