code: static KeyRange keyRangeStartRow(byte[] startRowKey) {
          KeyRange keyRange = new KeyRange();
          keyRange.setStart_key(startRowKey);
          keyRange.setEnd_key(EMPTY_BYTE_BUFFER);
          keyRange.setCount(MAX_ROWS_BATCH_SIZE);
          return keyRange;
      }
docs: Create a KeyRange that begins at the given row key.
  
  @param startRowKey   Starting row key as a byte[].
  @return              KeyRange that starts at the given row, open-ended.