@Override
  public String toString() {
    return getClass().toString()
        + "["
        + columnNames
        + ":"
        + columnTypes + "]";
  }
LazyBinaryColumnarSerDe. This serde combines elements of columnar serde and lazybinary serde
to produce a serde which serializes columns into a BytesRefArrayWritable in a compact binary
format and which is deserialized in a lazy, i.e. on-demand fashion.
serde/src/java/org/apache/hadoop/hive/serde2/columnar/LazyBinaryColumnarSerDe.java