Github user jodersky commented on a diff in the pull request:
https://github.com/apache/spark/pull/15257#discussion_r81207545
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/literals.scala
---
@@ -60,6 +70,45 @@ object Literal {
}
/**
+ * Returns the Spark SQL DataType for a given class object. Since this
type needs to be resolved
+ * in runtime, we use match-case idioms for class objects here. However,
there are similar
+ * functions in other files (e.g., HiveInspectors), so these functions
need to merged into one.
+ */
+ private[this] def componentTypeToDataType(clz: Class[_]): DataType = clz
match {
+ // primitive types
+ case c: Class[_] if c == jShort.TYPE => ShortType
--- End diff --
Here is an example:
```scala
case object container {def value: Int = 42}
case object Container {def value: Int = 42}
def extract(wrapper: Any) = wrapper match {
case container => container.value // error: value "value" is not a
member of Any
case Container => Container.value // ok
}
```
It's not a very good example, maybe something like
http://stackoverflow.com/a/6576663/917519 will give you a better use-case
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