cloud-fan commented on a change in pull request #34352:
URL: https://github.com/apache/spark/pull/34352#discussion_r733473500
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/internal/BaseSessionStateBuilder.scala
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@@ -410,6 +415,35 @@ class SparkUDFExpressionBuilder extends
FunctionExpressionBuilder {
name, expr.inputTypes.size.toString, input.size)
}
expr
+ } else if (classOf[Aggregator[_, _, _]].isAssignableFrom(clazz)) {
+ val aggregator =
clazz.getConstructor().newInstance().asInstanceOf[Aggregator[Any, Any, Any]]
+
+ // Construct the input encoder
+ val mirror = universe.runtimeMirror(clazz.getClassLoader)
+ val classType = mirror.classSymbol(clazz)
+ val baseClassType = universe.typeOf[Aggregator[_, _,
_]].typeSymbol.asClass
+ val baseType =
universe.internal.thisType(classType).baseType(baseClassType)
+ val tpe = baseType.typeArgs.head
+ val cls = mirror.runtimeClass(tpe)
+ val serializer = ScalaReflection.serializerForType(tpe)
+ val deserializer = ScalaReflection.deserializerForType(tpe)
+ val inputEncoder = new ExpressionEncoder[Any](
+ serializer,
+ deserializer,
+ ClassTag(cls))
Review comment:
```suggestion
val inputEncoder = new ExpressionEncoder[Any](serializer,
deserializer, ClassTag(cls))
```
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