public Set<Feature> getFeatures() {
    return Collections.unmodifiableSet(this.features);
  }
Look up a column based on its index.

@param internalName The name of the column
@return The index of the field or -1 if the field name does not contain its
        index number too
serde/src/java/org/apache/hadoop/hive/serde2/json/HiveJsonReader.java