Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/9806#issuecomment-157749632
Your code looks pretty clean to me. Let me share my test cases this PR
failed.
```
test("joinWith tuple - self join 1") {
val ds = Seq(("a", 1), ("b", 2)).toDS()
ds.joinWith(ds, $"_2" === $"_2").collect()
}
test("joinWith tuple - self join 2") {
val ds1 = Seq(("a", 1), ("b", 2)).toDS()
val ds2 = Seq(("a", 1), ("b", 2)).toDS().as("a")
ds1.joinWith(ds2, $"_2" === $"a._2").collect()
}
```
Do you want me to send me a PR? Or you will fix them?
Thank you!
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