/**
* Get the GenericUDAF evaluator for the name and argumentClasses.
*
* @param name the name of the UDAF
* @param argumentOIs
* @param isDistinct
* @param isAllColumns
* @return The UDAF evaluator
*/
@SuppressWarnings("deprecation")
public GenericUDAFEvaluator getGenericUDAFEvaluator(
String name, List<ObjectInspector> argumentOIs, boolean isDistinct, boolean isAllColumns)
throws SemanticException {
GenericUDAFResolver udafResolver = getGenericUDAFResolver(name);
if (udafResolver == null) {
return null;
}
GenericUDAFEvaluator udafEvaluator;
ObjectInspector args[] = new ObjectInspector[argumentOIs.size()];
// Can't use toArray here because Java is dumb when it comes to
// generics + arrays.
for (int ii = 0; ii < argumentOIs.size(); ++ii) {
args[ii] = argumentOIs.get(ii);
}
GenericUDAFParameterInfo paramInfo =
new SimpleGenericUDAFParameterInfo(args, isDistinct, isAllColumns);
if (udafResolver instanceof GenericUDAFResolver2) {
udafEvaluator = ((GenericUDAFResolver2) udafResolver).getEvaluator(paramInfo);
} else {
udafEvaluator = udafResolver.getEvaluator(paramInfo.getParameters());
}
return udafEvaluator;
}
public WindowFunctionInfo(
FunctionType functionType,
String functionName,
GenericUDAFResolver resolver,
FunctionResource[] resources) {
super(functionType, functionName, resolver, resources);
WindowFunctionDescription def =
AnnotationUtils.getAnnotation(resolver.getClass(), WindowFunctionDescription.class);
supportsWindow = def == null ? true : def.supportsWindow();
pivotResult = def == null ? false : def.pivotResult();
impliesOrder = def == null ? false : def.impliesOrder();
}
