GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/18813
[SPARK-21567][SQL] Dataset should work with type alias
## What changes were proposed in this pull request?
If we create a type alias for a type workable with Dataset, the type alias
doesn't work with Dataset.
A reproducible case looks like:
object C {
type TwoInt = (Int, Int)
def tupleTypeAlias: TwoInt = (1, 1)
}
Seq(1).toDS().map(_ => ("", C.tupleTypeAlias))
It throws an exception like:
type T1 is not a class
scala.ScalaReflectionException: type T1 is not a class
at
scala.reflect.api.Symbols$SymbolApi$class.asClass(Symbols.scala:275)
...
This patch accesses the dealias of type in many places in `ScalaReflection`
to fix it.
## How was this patch tested?
Added test case.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 SPARK-21567
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18813.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #18813
----
commit 8a4b63d2928ee93410764d2b8cec33c562f0eeb7
Author: Liang-Chi Hsieh <vii...@gmail.com>
Date: 2017-08-02T06:59:54Z
Dataset should work with type alias.
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