public ColumnEncoding getKeyEncoding() {
    return keyEncoding;
  }
@param columnFamily
         The column family that all qualifiers within should be placed into the same Hive map
@param columnQualifierPrefix
         The column qualifier prefix to include in the map, null is treated as an empty prefix
@param keyEncoding
         The encoding scheme for keys in this column family
@param valueEncoding
         The encoding scheme for the Accumulo values
accumulo-handler/src/java/org/apache/hadoop/hive/accumulo/columns/HiveAccumuloMapColumnMapping.java