/**
* Sets {@link #REQUIRED_FIELD_INDICES_CONF} to list of indices if requiredFieldList is not null.
*/
public static void setRequiredFieldConf(Configuration conf, RequiredFieldList requiredFieldList) {
// set required fields conf for RCFile[Protobuf|Thrift] input format
if (requiredFieldList != null) {
List<Integer> indices = Lists.newArrayList();
for (RequiredField f : requiredFieldList.getFields()) {
indices.add(f.getIndex());
}
conf.set(RCFileUtil.REQUIRED_FIELD_INDICES_CONF, Joiner.on(",").join(indices));
}
}
private static RequiredFieldList evenFields(List<FieldDescriptor> protoFields) {
RequiredFieldList reqList = new RequiredFieldList();
int i = 0;
for (FieldDescriptor fd : protoFields) {
if (i % 2 == 0) {
RequiredField field = new RequiredField();
field.setAlias(fd.getName());
field.setIndex(i);
// field.setType() type is not used
reqList.add(field);
}
i++;
}
return reqList;
}