String last_name = names[names.length - 1];
for (int i = 1; i < names.length; i++) {
if (oi instanceof StructObjectInspector) {
StructObjectInspector soi = (StructObjectInspector) oi;
StructField sf = soi.getStructFieldRef(names[i]);
if (sf == null) {
throw new MetaException("Invalid Field " + names[i]);
} else {
oi = sf.getFieldObjectInspector();
}
} else if (oi instanceof ListObjectInspector
&& names[i].equalsIgnoreCase("$elem$")) {
ListObjectInspector loi = (ListObjectInspector) oi;
oi = loi.getListElementObjectInspector();
} else if (oi instanceof MapObjectInspector
&& names[i].equalsIgnoreCase("$key$")) {
MapObjectInspector moi = (MapObjectInspector) oi;
oi = moi.getMapKeyObjectInspector();
} else if (oi instanceof MapObjectInspector
&& names[i].equalsIgnoreCase("$value$")) {
MapObjectInspector moi = (MapObjectInspector) oi;
oi = moi.getMapValueObjectInspector();
} else {
throw new MetaException("Unknown type for " + names[i]);
}
}
ArrayList<FieldSchema> str_fields = new ArrayList<FieldSchema>();
// rules on how to recurse the ObjectInspector based on its type
if (oi.getCategory() != Category.STRUCT) {
str_fields.add(new FieldSchema(last_name, oi.getTypeName(),
FROM_SERIALIZER));
} else {
List<? extends StructField> fields = ((StructObjectInspector) oi)
.getAllStructFieldRefs();
for (int i = 0; i < fields.size(); i++) {
StructField structField = fields.get(i);
String fieldName = structField.getFieldName();
String fieldTypeName = structField.getFieldObjectInspector().getTypeName();
String fieldComment = determineFieldComment(structField.getFieldComment());
str_fields.add(new FieldSchema(fieldName, fieldTypeName, fieldComment));
}
}
return str_fields;