twalthr commented on a change in pull request #8062:  [FLINK-11884][table] 
Implement expression resolution on top of new Expressions
URL: https://github.com/apache/flink/pull/8062#discussion_r273117051
 
 

 ##########
 File path: 
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/plan/logical/groupWindows.scala
 ##########
 @@ -18,22 +18,25 @@
 
 package org.apache.flink.table.plan.logical
 
+import java.util.Optional
+import java.util.{List => JList}
+
 import org.apache.flink.table.api.{BatchTableEnvironment, 
StreamTableEnvironment, TableEnvironment}
 import 
org.apache.flink.table.expressions.PlannerExpressionUtils.{isRowCountLiteral, 
isRowtimeAttribute, isTimeAttribute, isTimeIntervalLiteral}
 import org.apache.flink.table.expressions._
-import org.apache.flink.table.typeutils.TypeCheckUtils.{isTimePoint, isLong}
+import org.apache.flink.table.typeutils.TypeCheckUtils.{isLong, isTimePoint}
 import org.apache.flink.table.validate.{ValidationFailure, ValidationResult, 
ValidationSuccess}
 
 // 
------------------------------------------------------------------------------------------------
 // Over windows
 // 
------------------------------------------------------------------------------------------------
 
 case class LogicalOverWindow(
 
 Review comment:
   Make this file a POJO in `o.a.f.t.operations` in a separate commit? We need 
some representation of windows as output of the API for the planner. Must not 
necessarily containing expressions only. Or only resolved expressions. 

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