Recursive DataType in Scala

Question

Hi I was wondering if someone could explain this signature I found in the Spark codebase. It looks like a recursive datatype, it's used to build the query plan so it kind of makes sense. Does anyone have anymore detailed knowledge of this?

abstract class TreeNode[BaseType <: TreeNode[BaseType]] extends Product

"Does anyone have anymore detailed knowledge of this?" is a question about the existence of knowledgeable people in a specific area of research, it is not a valid SO question. — Andrey Tyukin
– Andrey Tyukin, Commented Feb 18, 2018 at 10:38

Evgeny · Accepted Answer · 2018-02-18 08:49:07Z

7

It is F-Bounded Types (or self-recursive types). Not scala specific, e.g. equivalent in java

public abstract class Enum<E extends Enum<E>> implements Comparable<E>

You can read here or here

answered Feb 18, 2018 at 8:49

Evgeny

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