public static void setRepeatingLongCol(LongColumnVector col) {
    col.isRepeating = true;
    col.vector[0] = 50;
  }
Set the vector to random data in the range 0 to 99.
This has significant overhead for random number generation. Use setSample() to reduce overhead.
ql/src/test/org/apache/hadoop/hive/ql/exec/vector/TestVectorizedRowBatch.java