code: static SlicePredicate slicePredicateColName(byte[] colName) {
          SlicePredicate slicePred = new SlicePredicate();
          slicePred.addToColumn_names(ByteBuffer.wrap(colName));
          return slicePred;
      }
docs: Create a SlicePredicate that selects a single column.
  
  @param colName   Column name as a byte[].
  @return          SlicePredicate that select the given column name only.