dawidwys commented on a change in pull request #8087: [FLINK-12029][table] Add 
column operations for TableApi
URL: https://github.com/apache/flink/pull/8087#discussion_r274784319
 
 

 ##########
 File path: 
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/api/tableImpl.scala
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 @@ -564,26 +575,47 @@ class WindowGroupedTableImpl(
       fields)
   }
 
+  private def expandColumnsInGroupWindow(window: GroupWindow): GroupWindow = {
 
 Review comment:
   I think we should rather modify the `extractFieldReference` to extract also 
column expressions (They are actually field references). That way we will have 
a more unified approach and we can use the rule to expand them only in the 
`ExpressionResolver`

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