* Returns the scatter type for a walker.
* @param walkerType The walker to check.
* @return The scatter type for the walker.
*/
private String getScatterClass(Class<? extends Walker> walkerType) {
PartitionType partitionType = walkerType.getAnnotation(PartitionBy.class).value();
if (partitionType == PartitionType.NONE)
return null;
return StringUtils.capitalize(partitionType.name().toLowerCase()) + "ScatterFunction";
}