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https://issues.apache.org/jira/browse/FLINK-3474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15177586#comment-15177586
]
ASF GitHub Bot commented on FLINK-3474:
---------------------------------------
Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1746#issuecomment-191689616
Hi @ChengXiangLi, you need copy this code snippet from
`DataSetGroupReduce.translateToPlan()` to `DataSetMap.translateToPlan()` to
enforce `Row` as input type:
```
expectedType match {
case Some(typeInfo) if typeInfo.getTypeClass != classOf[Row] =>
throw new PlanGenException("GroupReduce operations currently only
support returning Rows.")
case _ => // ok
}
val inputDS = input.asInstanceOf[DataSetRel].translateToPlan(
config,
// tell the input operator that this operator currently only
supports Rows as input
Some(TypeConverter.DEFAULT_ROW_TYPE))
```
> Partial aggregate interface design and sort-based implementation
> ----------------------------------------------------------------
>
> Key: FLINK-3474
> URL: https://issues.apache.org/jira/browse/FLINK-3474
> Project: Flink
> Issue Type: Sub-task
> Components: Table API
> Reporter: Chengxiang Li
> Assignee: Chengxiang Li
>
> The scope of this sub task includes:
> # Partial aggregate interface.
> # Simple aggregate function implementation, such as SUM/AVG/COUNT/MIN/MAX.
> # DataSetAggregateRule which translate logical calcite aggregate node to
> Flink user functions. As hash-based combiner is not available yet(see PR
> #1517), we would use sort-based combine as default.
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