Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5505#discussion_r28348897
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -121,7 +121,7 @@ class DataFrameSuite extends QueryTest {
)
}
- test("self join with aliases") {
+ ignore("self join with aliases") {
--- End diff --
The more I think about this, the more I am worried that we can't make a
change this large. There is no way to express self join queries if we don't
handle `.` in column names. We are also going to break lots of existing user
code...
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