Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18574#discussion_r126356309
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
---
@@ -112,7 +112,12 @@ class SimpleFunctionRegistry extends FunctionRegistry {
throw new AnalysisException(s"undefined function $name")
}
}
- func(children)
+ try {
+ func(children)
--- End diff --
I mean something like
```
def register[RT: TypeTag](name: String, func: Function0[RT]):
UserDefinedFunction = {
val ScalaReflection.Schema(dataType, nullable) =
ScalaReflection.schemaFor[RT]
val inputTypes = Try(Nil).toOption
def builder(e: Seq[Expression]) = {
if (e.length != 0) {
throw ...
} else {
ScalaUDF(func, dataType, e, inputTypes.getOrElse(Nil), Some(name),
nullable)
}
}
functionRegistry.createOrReplaceTempFunction(name, builder)
UserDefinedFunction(func, dataType,
inputTypes).withName(name).withNullability(nullable)
}
```
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