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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