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https://issues.apache.org/jira/browse/FLINK-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15684619#comment-15684619
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ASF GitHub Bot commented on FLINK-4832:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/2840#discussion_r88978720
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/api/scala/batch/sql/AggregationsITCase.scala
---
@@ -258,4 +258,42 @@ class AggregationsITCase(
// must fail. grouping sets are not supported
tEnv.sql(sqlQuery).toDataSet[Row]
}
+
+ @Test
+ def testDummyRecords(): Unit = {
--- End diff --
rename method to `testAggregateEmptyDataSets`.
> Count/Sum 0 elements
> --------------------
>
> Key: FLINK-4832
> URL: https://issues.apache.org/jira/browse/FLINK-4832
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Anton Mushin
>
> Currently, the Table API is unable to count or sum up 0 elements. We should
> improve DataSet aggregations for this. Maybe by union the original DataSet
> with a dummy record or by using a MapPartition function. Coming up with a
> good design for this is also part of this issue.
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