@Override
      public Object writeValue(long value) {
        interval.set((int) value);
        ((SettableHiveIntervalYearMonthObjectInspector) this.objectInspector).set(obj, interval);
        return obj;
      }
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