[GitHub] [flink] wuchong commented on a change in pull request #9208: [FLINK-13378][table-planner-blink] Fix bug: Blink-planner not support SingleValueAggFunction

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wuchong commented on a change in pull request #9208: [FLINK-13378][table-planner-blink] Fix bug: Blink-planner not support SingleValueAggFunction
URL: https://github.com/apache/flink/pull/9208#discussion_r306745424
 
 

 ##########
 File path: flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/expressions/call.scala
 ##########
 @@ -221,3 +221,21 @@ case class PlannerTableFunctionCall(
   override def toString =
     s"${tableFunction.getClass.getCanonicalName}(${parameters.mkString(", ")})"
 }
+
+case class ThrowException(msg: PlannerExpression, tp: TypeInformation[_]) extends UnaryExpression {
+
+  override private[flink] def resultType = tp
 
 Review comment:
   nit: declare return types explicitly `resultType: TypeInformation[_]`

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