Github user ravipesala commented on a diff in the pull request:
    --- Diff: 
core/src/main/java/org/apache/carbondata/core/datamap/ ---
    @@ -14,37 +14,25 @@
      * See the License for the specific language governing permissions and
      * limitations under the License.
    -package org.apache.carbondata.core.indexstore;
    +package org.apache.carbondata.core.datamap;
    - * Data Map writer
    - */
    -public interface DataMapWriter<T> {
    +public class DataMapMeta {
    -  /**
    -   * Initialize the data map writer with output stream
    -   *
    -   * @param outStream
    -   */
    -  void init(DataOutput outStream);
    +  public DataMapMeta(String indexedColumn, OperationType 
optimizedOperation) {
    --- End diff --
    I think it should be array of columns, user can create composite index as 

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