请问Flink这个语句哪里写的有问题么?运行不过去?CREATE TABLE dwd_czc_gnss_info ( id STRING, gps_time TIMESTAMP(3), WATERMARK FOR gps_time AS gps_time - INTERVAL '1' MINUTE ) WITH ( 'connector' = 'kafka', 'topic' = 'dwd_czc_gnss_info', 'properties.bootstrap.servers' = 'node3:9092,node2:9092,node4:9092', 'scan.startup.mode' = 'latest-offset', 'properties.group.id' = 'wuhan_czc_ads', 'format' = 'json' ); CREATE TABLE ts_taxi_area_empty_rate_real_d ( TUMBLE_START STRING, num INT ) WITH ( 'connector' = 'print' ); INSERT INTO ts_taxi_area_empty_rate_real_d SELECT
TUMBLE_START(gps_time, INTERVAL '2' MINUTE) as TUMBLE_START, COUNT(DISTINCT id) AS num FROM dwd_czc_gnss_info GROUP BY TUMBLE(gps_time, INTERVAL '2' MINUTE);
可能在INSERT INTO语句中,TUMBLE_START作为别名字段,但是在SELECT语句中应该直接使用TUMBLE_START(gps_time, INTERVAL '2' MINUTE)作为窗口聚合的一部分。
调整语句参考如下:
CREATE TABLE dwd_czc_gnss_info (
id STRING,
gps_time TIMESTAMP(3),
WATERMARK FOR gps_time AS gps_time - INTERVAL '1' MINUTE -- 检查这个语法是否正确
) WITH (
connector = 'kafka',
topic = 'dwd_czc_gnss_info',
properties.bootstrap.servers = 'node3:9092,node2:9092,node4:9092',
scan.startup.mode = 'latest-offset',
properties.group.id = 'wuhan_czc_ads',
format = 'json'
);
CREATE TABLE ts_taxi_area_empty_rate_real_d (
TUMBLE_START TIMESTAMP(3), -- 这里应该是TIMESTAMP类型
num INT
) WITH (
connector = 'print'
);
INSERT INTO ts_taxi_area_empty_rate_real_d
SELECT
TUMBLE_START(gps_time, INTERVAL '2' MINUTE) as TUMBLE_START,
COUNT(DISTINCT id) AS num
FROM dwd_czc_gnss_info
GROUP BY TUMBLE(gps_time, INTERVAL '2' MINUTE);
根据您提供的信息,Flink语句中有几个问题需要修正。
首先,'format'属性的值应为'json',需要将其修改为'json',而不是'format' = 'jsion'。
另外,INSERT INTO语句的SELECT子句中的TUMBLE_START函数应该被改为TUMBLE_START(gps_time, INTERVAL '2' MINUTE) as TUMBLE_START。
修正后的Flink语句如下所示:
CREATE TABLE dwd_czc_gnss_info (
id STRING,
gps_time TIMESTAMP(3),
WATERMARK FOR gps_time AS gps_time - INTERVAL '1' MINUTE
) WITH (
'connector' = 'kafka',
'topic' = 'dwd_czc_gnss_info',
'properties.bootstrap.servers' = 'node3:9092,node2:9092,node4:9092',
'scan.startup.mode' = 'latest-offset',
'properties.group.id' = 'wuhan_czc_ads',
'format' = 'json'
);
CREATE TABLE ts_taxi_area_empty_rate_real_d (
TUMBLE_START STRING,
num INT
) WITH (
'connector' = 'print'
);
INSERT INTO ts_taxi_area_empty_rate_real_d
SELECT
TUMBLE_START(gps_time, INTERVAL '2' MINUTE) as TUMBLE_START,
COUNT(DISTINCT id) AS num
FROM
dwd_czc_gnss_info
GROUP BY
TUMBLE(gps_time, INTERVAL '2' MINUTE);
在运行此代码之前,确保您已经正确安装和配置了相关的Flink环境,并且所需的依赖项已经正确引入。
该Flink SQL语句中存在一个问题,即在INSERT INTO
子句中引用了TUMBLE_START
字段,但在目标表ts_taxi_area_empty_rate_real_d
的定义中,TUMBLE_START
字段的数据类型是STRING
,而在SELECT
子句中,TUMBLE_START(gps_time, INTERVAL '2' MINUTE)
返回的是一个TIMESTAMP
类型。因此,数据类型不匹配导致了错误。
为了解决这个问题,你需要将目标表ts_taxi_area_empty_rate_real_d
中的TUMBLE_START
字段类型改为TIMESTAMP
,如下所示:
CREATE TABLE dwd_czc_gnss_info (
id STRING,
gps_time TIMESTAMP(3),
WATERMARK FOR gps_time AS gps_time - INTERVAL '1' MINUTE
) WITH (
'connector' = 'kafka',
'topic' = 'dwd_czc_gnss_info',
'properties.bootstrap.servers' = 'node3:9092,node2:9092,node4:9092',
'scan.startup.mode' = 'latest-offset',
'properties.group.id' = 'wuhan_czc_ads',
'format' = 'json'
);
CREATE TABLE ts_taxi_area_empty_rate_real_d (
TUMBLE_START TIMESTAMP,
num INT
) WITH (
'connector' = 'print'
);
INSERT INTO ts_taxi_area_empty_rate_real_d
SELECT
TUMBLE_START(gps_time, INTERVAL '2' MINUTE) as TUMBLE_START,
COUNT(DISTINCT id) AS num
FROM dwd_czc_gnss_info
GROUP BY TUMBLE(gps_time, INTERVAL '2' MINUTE);
这样修改后,INSERT INTO
语句中的TUMBLE_START
字段类型就和目标表中的定义一致了。
可能需要检查以下几点:
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