public byte[] getStartAndPrefix() {
      setStartAndPrefix(org.apache.thrift.TBaseHelper.rightSize(startAndPrefix));
      return startAndPrefix == null ? null : startAndPrefix.array();
    }
the prefix (and thus start row) of the keys you want
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift/generated/Hbase.java