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))
```
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