@Override
  protected void func(DecimalColumnVector outV, LongColumnVector inV, int i) {
    outV.vector[i].deserialize64(inV.vector[i], ((Decimal64ColumnVector) inV).scale);
  }
To be used to convert decimal64 long to decimal.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/expressions/ConvertDecimal64ToDecimal.java