Flink streaming table using kafka source and using flink sql to query

Question

I'm trying to read data from kafka topic into DataStream and register DataStream , after that use TableEnvironment.sqlQuery("SQL") to query the data, when TableEnvironment.execute() there is no error and no output.

public static void main(String[] args){
   StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
   env.setStreamTimeCharacteristic(TimeCharateristic.EventTime);
   env.enableCheckpointing(5000);
   StreamTableEnvironment tableEnvironment = StreamTableEnvironment.create(env);
   FlinkKafkaConsumer<Person> consumer = new FlinkKafkaConsumer(
                                                                "topic",
                                                                 new JSONDeserializer(),
                                                                 Job.getKafkaProperties
                                                               );

  consumer.setStartFromEarliest();
  DataStream<Person> stream = env.addSource(consumer).fliter(x -> x.status != -1).assignTimestampAndWatermarks(new AssignerWithPeriodicWatermarks<Person>(){
      long current = 0L;
      final long expire = 1000L;

      @Override
      public Watermakr getCurrentWatermark(){
         return new Watermark(current - expire);
      }

      @Override
      public long extractTimestamp(Person person){
         long timestamp = person.createTime;
         current = Math.max(timestamp,current);
         return timestamp;
      }
  });
  //set createTime as rowtime
  tableEnvironment.registerDataStream("Table_Person",stream,"name,age,sex,createTime.rowtime");
  Table res = tableEnvironment.sqlQuery("select TUMBLE_END(createTime,INTERVAL '1' minute) as registTime,sex,count(1) as total from Table_Person group by sex,TUMBLE(createTime,INTERVAL '1' minute)");
  tableEnvironment.toAppendStream(t,Types.Row(new TypeInformation[]{Types.SQL_TIMESTAMP,Types.STRING,Types.LONG})).print();
tableEnvironment.execute("person-query");
}

when i execute,there was nothing print on console or throw any exceptions; but if i use fromCollection() as a source,the program will print something on the console; Can you please guide me to fix this?

dependencies:

1. flink-streaming-java_2.11 version:1.9.0-csa1.0.0.0;
2. flink-streaming-scala_2.11 version:1.9.0-csa1.0.0.0;
3. flink-connector-kafka_2.11 version:1.9.0-csa1.0.0.0;
4. flink-table-api-java-bridge_2.11 version:1.9.0-csa1.0.0.0;
5. flink-table-planner_2.11 version:1.9.0-csa1.0.0.0;

Answer 1

In the code where you convert the SQL query's result back to a DataStream, you need to pass res rather than t to toAppendStream . (I can't see how the code you've posted will even compile — where is t declared?) And I think you should be able to do this

Table res = tableEnvironment.sqlQuery("select TUMBLE_END(createTime,INTERVAL '1' minute) as registTime,sex,count(1) as total from Table_Person group by sex,TUMBLE(createTime,INTERVAL '1' minute)");
tableEnvironment.toAppendStream(res,Row.class).print();

rather than bothering with the TypeInformation .