Github user yjshen commented on a diff in the pull request: https://github.com/apache/flink/pull/2025#discussion_r64383299 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/nodes/dataset/DataSetUnion.scala --- @@ -69,16 +73,23 @@ class DataSetUnion( rows + metadata.getRowCount(child) } - planner.getCostFactory.makeCost(rowCnt, 0, 0) + planner.getCostFactory.makeCost( + rowCnt, + if (all) 0 else rowCnt, + if (all) 0 else rowCnt) } override def translateToPlan( tableEnv: BatchTableEnvironment, expectedType: Option[TypeInformation[Any]]): DataSet[Any] = { - val leftDataSet = left.asInstanceOf[DataSetRel].translateToPlan(tableEnv) - val rightDataSet = right.asInstanceOf[DataSetRel].translateToPlan(tableEnv) - leftDataSet.union(rightDataSet).asInstanceOf[DataSet[Any]] + val leftDataSet = left.asInstanceOf[DataSetRel].translateToPlan(tableEnv, expectedType) + val rightDataSet = right.asInstanceOf[DataSetRel].translateToPlan(tableEnv, expectedType) --- End diff -- `expectedType` is passed down to `Union`'s children, enables possible conversion to `Row` enforced by `Aggregate`.
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