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https://issues.apache.org/jira/browse/FLINK-21430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17288146#comment-17288146
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Jark Wu commented on FLINK-21430:
---------------------------------
Please update description in English.
> Appear append data when flink sql sink mysql on key conflict
> ------------------------------------------------------------
>
> Key: FLINK-21430
> URL: https://issues.apache.org/jira/browse/FLINK-21430
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Runtime
> Affects Versions: 1.12.0
> Reporter: Yu Wang
> Priority: Major
>
> kafka 数据格式：
> {"building_id":"trRlI9PL","sofa_id":"dJI53xLp","floor_num":10,"occupy_status":1,"start_time":1613802148092,"end_time":1613803144969,"process_time":"2021-02-20
> 06:39:05.088"}
> {"building_id":"trRlI9PL","sofa_id":"dJI53xLp","floor_num":10,"occupy_status":1,"start_time":1613803609813,"end_time":1613803654280,"process_time":"2021-02-20
> 06:47:34.609"}
> kafka ddl :
> CREATE TABLE washroom_detail (
> building_id STRING,
> sofa_id STRING,
> floor_num INT,
> occupy_status INT,
> start_time BIGINT,
> end_time BIGINT,
> process_time TIMESTAMP,
> occupy_times as concat(date_format(TIMESTAMPADD(hour, 8,
> cast(start_time / 1000 as timestamp)), 'HH:mm'), '-',
> date_format(TIMESTAMPADD(hour, 8, cast(end_time / 1000 as timestamp)),
> 'HH:mm')),
> local_date as date_format(cast(start_time / 1000 as
> timestamp), 'yyyy-MM-dd'),
> day_hour as cast(date_format(cast(start_time / 1000 as
> timestamp), 'HH') as INT) + 8
> ) WITH (
> 'connector' = 'kafka',
> 'topic' = 'xxxxxxxx',
> 'properties.bootstrap.servers' = 'xxxxxxxxxxxxxxx',
> 'properties.group.id' = 'xxxxxxxxxxxx',
> 'scan.startup.mode' = 'earliest-offset',
> 'format' = 'json'
> );
> mysql ddl:
> create table hour_ddl
> (
> building_id STRING,
> sofa_id STRING,
> local_date STRING,
> `hour` INT,
> floor_num INT,
> occupy_frequency INT,
> occupy_times STRING,
> update_time TIMESTAMP,
> process_time TIMESTAMP,
> primary key (building_id, sofa_id, local_date, `hour`)
> NOT ENFORCED
> ) with (
> 'connector' = 'jdbc',
> 'url' = 'xxxxxxxx',
> 'table-name' = 'xxxxxxxx',
> 'username' = 'xxxxx'
> 'password' = 'xxxxxx'
> )
> flink sql dml:
> INSERT INTO hour_ddl (building_id, sofa_id, local_date, `hour`, floor_num,
> occupy_frequency, occupy_times, update_time, process_time)
> SELECT a.building_id,
> a.sofa_id,
> a.local_date,
> a.day_hour,
> a.floor_num,
> CAST(a.frequency + IF(b.occupy_frequency IS NULL, 0,
> b.occupy_frequency) AS INT),
> concat(if(b.occupy_times IS NULL, '', b.occupy_times),
> if(b.occupy_times IS NULL, a.times, concat(',', a.times))),
> NOW(),
> a.process_time
> FROM
> (SELECT building_id,
> sofa_id,
> local_date,
> day_hour,
> floor_num,
> count(1) AS frequency,
> LISTAGG(occupy_times) AS times,
> MAX(process_time) AS process_time,
> PROCTIME() AS compute_time
> FROM washroom_detail
> GROUP BY building_id,
> sofa_id,
> local_date,
> day_hour,
> floor_num) a
> LEFT JOIN hour_ddl
> FOR SYSTEM_TIME AS OF a.compute_time AS b ON a.building_id = b.building_id
> AND a.sofa_id = b.sofa_id
> AND a.local_date = b.local_date
> AND a.day_hour = b.`hour`
> WHERE a.process_time > b.process_time
> OR b.process_time IS NULL
> 现象：
> 当mysql 没有数据时，插入一条记录:
> occupy_frequency occupy_times
> 1 15:01-15:03
> 当主键冲突时,现象是：
> occupy_frequency occupy_times
> 3 15:01-15:03,15:01-15:03,15:03-15:04
> 结果应该是:
> {color:red}occupy_frequency occupy_times
> 2
> 15:01-15:03,15:03-15:04{color}
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