@Override
      public Object writeValue(HiveDecimal value) throws HiveException {
        return ((SettableHiveDecimalObjectInspector) this.objectInspector).set(obj, value);
      }
Compiles the appropriate vector expression writers based on a struct object
inspector.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/expressions/VectorExpressionWriterFactory.java