Github user LantaoJin commented on the issue:
https://github.com/apache/spark/pull/20803
@cloud-fan @jerryshao In the last commit, seems I faced a Scala bug. :-(
> [error]
/Users/lajin/git/my/spark/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala:63:
in object Dataset, multiple overloaded alternatives of <init> define default
arguments
[error] Error occurred in an application involving default arguments.
[error] private[sql] object Dataset {
[error] ^
https://stackoverflow.com/questions/24991209/scala-2-11-complains-with-multiple-overloaded-alternatives-of-method
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