@Override
  public VectorExpressionDescriptor.Descriptor getDescriptor() {
    VectorExpressionDescriptor.Builder b = new VectorExpressionDescriptor.Builder();
    b.setMode(VectorExpressionDescriptor.Mode.PROJECTION)
        .setNumArguments(2)
        .setArgumentTypes(
            VectorExpressionDescriptor.ArgumentType.FLOAT_FAMILY,
            VectorExpressionDescriptor.ArgumentType.FLOAT_FAMILY)
        .setInputExpressionTypes(
            VectorExpressionDescriptor.InputExpressionType.COLUMN,
            VectorExpressionDescriptor.InputExpressionType.SCALAR);
    return b.build();
  }
Vectorized implementation for Pow(a, power) and Power(a, power)
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/expressions/FuncPowerDoubleToDouble.java