例如:TIMESTAMPDIFF(DAY, TIMESTAMP '2022-02-11 10:00:00', TIMESTAMP '2022-02-13 10:00:00'),返回:2 使用例子: 函数名:CONVERT_TZ(string1, string2, string3) 函数说明: 将datetime string1(使用默认的ISO时间戳格式'yyyy-MM-dd HH:mm:ss...
public void flatMap(String value, Collector<Tuple2<String, Integer>> out) throws Exception { String[] tokens = value.toLowerCase().split(","); for(String token: tokens) { if(token.length()>0){ out.collect(new Tuple2<String, Integer>(token, 1)); } } } }).keyBy(0).timeWindow(...
分别使用AssignerWithPeriodicWatermarks和AssignerWithPunctuatedWatermarks来实现// 这里使用周期性产生WaterMark,延长2秒.assignTimestampsAndWatermarks(new BoundedOutOfOrdernessTimestampExtractor[String](Time.seconds
有些代码中,设置时间使用的是timeWindow而非window,比如,input.keyBy(...).timeWindow(Time.seconds(1))。timeWindow是一种简写。当我们在执行环境设置了TimeCharacteristic.EventTime时,Flink对应调用TumblingEventTimeWindows;如果我们基于TimeCharacteristic.ProcessingTime,Flink使用TumblingProcessingTimeWindows。 滑动窗口 滑...
* event timestamps, or to emit a watermark based on the event itself. */voidonEvent(Tevent,long eventTimestamp,WatermarkOutput output);/** * Called periodically, and might emit a new watermark, or not. * * <p>The interval in which this method is called and Watermarks are generated ...
string1 SIMILAR TO string2 [ ESCAPE char ] 如果string1匹配SQL正则表达式string2返回true。 string1 NOT SIMILAR TO string2 [ ESCAPE char ] 如果string1与SQL正则表达式string2不匹配返回true。 value1 IN (value2 [, value3]* ) 在给定列表 (value2, value3, …) 中存在 value1返回true。
CREATETABLEorders(order_idSTRING,currencySTRING,amountINT,order_timeTIMESTAMP(3),WATERMARKFORorder_timeASorder_time-INTERVAL'30'SECOND)WITH(…);--Table backed by a Kafka compacted topicCREATETABLElatest_rates(currencySTRING,rateDECIMAL(38,10),currency_timeTIMESTAMP(3),WATERMARKFORcurrency_timeAScurrenc...
TIMESTAMP <-> STRING TIMESTAMP 和 STRING 进行互转时, 默认使用的都是 UTC-0 时区 -- 将 TIMESTAMP 类型按照指定的格式转换为 STRINGDATE_FORMAT(timestamp_field,'yyyy-MM-dd hh:mm:ss')-- 将 STRING 类型字段转换为 TIMESTAMP 类型TO_TIMESTAMP(string_field,'yyyy-MM-dd hh:mm:ss') ...
{ //发生异常,将数据写入测输出流 context.output(outputTag, s); } } }); jsonObjDs.getSideOutput(outputTag).print("Parse Err Data>>>"); jsonObjDs.getSideOutput(otherOutputTag).print("Other Data>>>"); jsonObjDs.map(r -> r.toJSONString()).addSink(MyKafkaUtil.getKafkaProducer("dwd...
public interface WatermarkStrategy<T> extends TimestampAssignerSupplier<T>, WatermarkGeneratorSupplier<T>{ // 负责从流中数据元素的某个字段中提取时间戳,并分配给元素。时间戳的分配是生成水位线的基础。 @Override TimestampAssigner<T> createTimestampAssigner(TimestampAssignerSupplier.Context context); // 主...