private static void initColors() {
    if (colorsBytes == null) {
      colorsBytes = new byte[COLORS.length][];
      for (int i = 0; i != COLORS.length; i++) {
        colorsBytes[i] = COLORS[i].getBytes();
      }
    }
  }
Set vector elements to sample string data from colorsBytes string table.
@param col
ql/src/test/org/apache/hadoop/hive/ql/exec/vector/TestVectorizedRowBatch.java