Weird, I recompiled Spark with a similar change to Model and it seemed
to work but maybe I missed a step in there.
On Wed, Aug 31, 2016 at 6:33 AM, Mohit Jaggi <mohitja...@gmail.com> wrote:
> I think I figured it out. There is indeed "something deeper in Scala” :-)
>
> abstract class A {
> def a: this.type
> }
>
> class AA(i: Int) extends A {
> def a = this
> }
>
> the above works ok. But if you return anything other than “this”, you will
> get a compile error.
>
> abstract class A {
> def a: this.type
> }
>
> class AA(i: Int) extends A {
> def a = new AA(1)
> }
>
> Error:(33, 11) type mismatch;
> found : com.dataorchard.datagears.AA
> required: AA.this.type
> def a = new AA(1)
> ^
>
> So you have to do:
>
> abstract class A[T <: A[T]] {
> def a: T
> }
>
> class AA(i: Int) extends A[AA] {
> def a = new AA(1)
> }
>
>
>
> Mohit Jaggi
> Founder,
> Data Orchard LLC
> www.dataorchardllc.com
>
>
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