当我使用flinksqlapi过程数据时。
重新启动应用程序 sum 结果未保存在检查点中。它仍以1开头。

final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
StateBackend stateBackend = new FsStateBackend("file:///D:/d_backup/github/flink-best-practice/checkpoint");
env.enableCheckpointing(1000 * 60);
env.setStateBackend(stateBackend);

Table table = tableEnv.sqlQuery(
        "select sum(area_id) " +
        "from rtc_warning_gmys " +
        "where area_id = 1 " +
        "group by character_id,area_id,group_id,platform");

//   convert the Table into a retract DataStream of Row.
//   A retract stream of type X is a DataStream<Tuple2<Boolean, X>>.
//   The boolean field indicates the type of the change.
//   True is INSERT, false is DELETE.
DataStream<Tuple2<Boolean, Row>> dsRow = tableEnv.toRetractStream(table, Row.class);
dsRow.map(new MapFunction<Tuple2<Boolean,Row>, Object>() {
    @Override
    public Object map(Tuple2<Boolean, Row> booleanRowTuple2) throws Exception {
        if(booleanRowTuple2.f0) {
            System.out.println(booleanRowTuple2.f1.toString());
            return booleanRowTuple2.f1;
        }
        return null;
    }
});

env.execute("Kafka table select");

登录方式：
1 2 3 ... ... 100
重新启动应用程序它仍然启动：1 2 3。。。
我认为总和值将存储在checkpint文件中，重新启动应用程序可以从checkpint读取最后的结果，如：
101 102 103 ... 120