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https://issues.apache.org/jira/browse/FLINK-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15702286#comment-15702286
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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_r89809360
--- Diff:
flink-libraries/flink-table/src/test/scala/org/apache/flink/api/scala/batch/table/AggregationsITCase.scala
---
@@ -400,5 +400,37 @@ class AggregationsITCase(
TestBaseUtils.compareResultAsText(results.asJava, expected)
}
+ @Test
+ def testAggregateEmptyDataSets(): Unit = {
--- End diff --
Table API and SQL are internally represented the same way.
We can drop the expensive ITCase for the Table API and add tests that check
the plan based on `TableTestBase` for the Table API instead.
> 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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