flink sql没有array_agg函数有办法解决吗?flink sql没有array_agg函数有办法解决吗?Flink SQL 中确实没...
SELECT JSON_ARRAY(orders.orderId); -- ON NULL -- returns '[null]' SELECT JSON_ARRAY(CAST(NULL AS STRING) NULL ON NULL); -- ON NULL -- returns '[]' SELECT JSON_ARRAY(CAST(NULL AS STRING) ABSENT ON NULL); -- returns '[[1]]' SELECT JSON_ARRAY(JSON_ARRAY(1)); -- '[]' J...
JSON_ARRAYAGG(items [ { NULL | ABSENT } ON NULL ]) 通过将项聚合成一个数组来构建一个JSON对象字符串。 值构建函数 -- implicit constructor with parenthesis (value1 [, value2]*) 返回从值列表 (value1, value2, …) 创建的行。 ARRAY ‘[’value1 [, value2 ]* ‘]’ ...
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def main(args: Array[String]): Unit = { //创建一个flink执行环境 val env = StreamExecutionEnvironment.getExecutionEnvironment // 为了方便测试,设置一个并行度 env.setParallelism(1) val properties = new Properties() properties.setProperty(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "true") ...
def main(args: Array[String]): Unit = { //创建执行环境 val env = StreamExecutionEnvironment.getExecutionEnvironment val inputStream= env.readTextFile("/opt/java2020_study/maven/flink1/src/main/resources/sensor.txt") env.setParallelism(1) ...
def main(args: Array[String]): Unit={ StreamExecutionEnvironment env=StreamExecutionEnvironment.getExecutionEnvironment env.setParallelism(1) val stream= env.addSource(newSensorSource) val settings=EnvironmentSettings .newInstance() .inStreamingMode() ...
def main(args: Array[String]): Unit = { //创建流处理环境 val env: StreamExecutionEnvironment = StreamExecutionEnvironment.getExecutionEnvironment //接收socket文本流 val dataStream: DataStream[String] = env.socketTextStream("spark2.x", 7777) ...
[_]], outputType: RelDataType, groupings: Array[Int], tableConfig: TableConfig): ( Option[DataSetPreAggFunction], Option[TypeInformation[Row]], Either[DataSetAggFunction, DataSetFinalAggFunction]) = { val needRetract = false val (aggInFields, aggregates, isDistinctAggs, accTypes, _)...
def main(args: Array[String]): Unit = { val env = StreamExecutionEnvironment.getExecutionEnvironment //如果想要开启重启策略,就必须开启CheckPoint env.enableCheckpointing(5000L) //指定状态存储后端,默认就是内存 //现在指定的是FsStateBackend,支持本地系统、 //new FsStateBackend要指定存储系统的协议:sch...