Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/12036#discussion_r57943265
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
---
@@ -52,6 +53,15 @@ trait FunctionRegistry {
/** Drop a function and return whether the function existed. */
def dropFunction(name: String): Boolean
+ /* Return the FunctionBuilder and ExpressionInfo for the specified
function name and classname. */
+ def makeFunctionBuilderAndInfo(
+ name: String,
+ functionClassName: String): (ExpressionInfo, FunctionBuilder) = {
+ val clazz =
Utils.getContextOrSparkClassLoader.loadClass(functionClassName)
+ val (_, (info, builder)) =
+ FunctionRegistry.expression(name,
clazz.asInstanceOf[Class[Expression]])
--- End diff --
We shouldn't expose this to the user. The reflection hacks we do down there
are intended to be for internal use only so we don't want the user to do
something like:
```
CREATE TEMPORARY FUNCTION my_func AS com.x.y.z.MyFunc
```
where `MyFunc` has the special `Expression` constructors that we expect.
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