Github user twalthr commented on a diff in the pull request:
    --- Diff: 
    @@ -0,0 +1,33 @@
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
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    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
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    +package org.apache.flink.api.table.runtime.aggregate
    +  * Base class for reading a window property. The property will be 
extracted once and
    +  * can be read multiple times.
    +  */
    +trait PropertyRead[T] extends Serializable {
    +  def extract(window: Window): Unit
    --- End diff --
    In general I agree to your solution, but right now we support to have the 
same operation multiple times in a query. E.g. 
    .window(Session withGap 3.milli on 'rowtime as 'w)
    .select('string, 'w.end, 'w.end)
    Your code would fail. Let's leave the aggregation as it is for now and 
rework it again later. The aggregations have to be reworked anyway for 

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