@Override
    public String toString() {
      StringBuilder sb = new StringBuilder();
      sb.append(" column_index: ").append(colIx);
      sb.append(" included_index: ").append(includedIx);
      sb.append(" stream_count: ").append(streamCount);
      int i = 0;
      for (StreamContext sc : streams) {
        if (sc != null) {
          sb.append(" stream_").append(i).append(":").append(sc.toString());
        }
        i++;
      }
      return sb.toString();
    }
Column index in the included columns only (for RG masks).
ql/src/java/org/apache/hadoop/hive/ql/io/orc/encoded/EncodedReaderImpl.java