Github user wuchong commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3111#discussion_r96160082
  
    --- Diff: 
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/AggregationTest.scala
 ---
    @@ -165,9 +165,13 @@ class AggregationTest extends TableTestBase {
         val util = batchTestUtil()
         val sourceTable = util.addTable[(Int, Long, Int)]("MyTable", 'a, 'b, 
'c)
     
    -    val resultTable = sourceTable.groupBy('a)
    +    // Move "where" before "groupBy" for the former query would generate
    +    // nondeterministic plans with same cost. If we change 
FlinkRuleSets.DATASET_OPT_RULES,
    +    // the importance of relNode may change, and the test may fail. This 
issue is mentioned
    +    // in FLINK-5394, we could move "where" to the end when FLINK-5394 is 
fixed.
    +    val resultTable = sourceTable.where('a === 1).groupBy('a)
    --- End diff --
    
    It might make sense to wait with this until #3058 is in. It is almost done 
I think.


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