public void fill(byte[] value) {
    isRepeating = true;
    isNull[0] = false;
    setVal(0, value, 0, value.length);
  }
Simplify vector by brute-force flattening noNulls and isRepeating
This can be used to reduce combinatorial explosion of code paths in VectorExpressions
with many arguments, at the expense of loss of some performance.
storage-api/src/java/org/apache/hadoop/hive/ql/exec/vector/BytesColumnVector.java