Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16724#discussion_r100687176
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/FileSourceStrategySuite.scala
---
@@ -487,6 +487,36 @@ class FileSourceStrategySuite extends QueryTest with
SharedSQLContext with Predi
}
}
+ test("SPARK-19352: Keep sort order of rows after external sorter when
writing") {
--- End diff --
again, this is not guaranteed, we should not test it.
This is an optimization and advanced users can leverage this to preserve
the sort order, but it may change in the future.
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