mgaido91 commented on a change in pull request #22957: [SPARK-25951][SQL]
Ignore aliases for distributions and orderings
URL: https://github.com/apache/spark/pull/22957#discussion_r242192474
##########
File path: sql/core/src/test/scala/org/apache/spark/sql/DatasetSuite.scala
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@@ -1549,6 +1551,38 @@ class DatasetSuite extends QueryTest with
SharedSQLContext {
Seq(Row("Amsterdam")))
}
+ test("SPARK-25951: avoid redundant shuffle on rename") {
Review comment:
it is still useful because it may happen a used writes something like:
```
select ... group by a as b, ...
```
(please notice that despite it makes no sense written in SQL, maybe with
other APIs is easier to happen).
And especially it is useful when updating the `outputPartitioning` in order
to check whether an expression produces the same result of another.
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