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https://issues.apache.org/jira/browse/FLINK-22853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17358307#comment-17358307
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Jark Wu commented on FLINK-22853:
---------------------------------
[~raypon.wang] could you have a check again? It seems the problem can't be
reproduced.
> Flink SQL functions max/min/sum return duplicated records
> ---------------------------------------------------------
>
> Key: FLINK-22853
> URL: https://issues.apache.org/jira/browse/FLINK-22853
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Affects Versions: 1.12.1
> Reporter: Raypon Wang
> Priority: Major
>
> mysql data：
> id offset
> 1 1
> 1 3
> 1 2
> flinksql code：(I used flink-connector-jdbc_2.12:1.12.1)
>
>
> object FlinkSqlOnJdbcForMysql {
> def main(args: Array[String]): Unit = {
> val settings =
> EnvironmentSettings.newInstance().useBlinkPlanner().inBatchMode().build()
> val tableEnvironment = TableEnvironment.create(settings)
> tableEnvironment.executeSql("" +
> "CREATE TABLE test (" +
> " id BIGINT," +
> " `offset` INT," +
> " PRIMARY KEY (id) NOT ENFORCED" +
> ") WITH (" +
> " 'connector' = 'jdbc'," +
> " 'driver' = 'com.mysql.cj.jdbc.Driver'," +
> " 'url' = 'jdbc:mysql://127.0.0.1:3306/test?&serverTimezone=Asia/Shanghai',"
> +
> " 'username' = 'root'," +
> " 'password' = 'Project.03'," +
> " 'table-name' = 'test'," +
> " 'scan.fetch-size' = '1000'," +
> " 'scan.auto-commit' = 'true'" +
> ")")
> tableEnvironment.executeSql(
> "select id,max(`offset`) from test group by id").print()
> }
> }
>
> result:
> +-----------------------+------------+
> |id|EXPR$1|
> +-----------------------+------------+
> |1|1|
> |1|3|
> |1|2|
> +-----------------------+------------+
> Result of max/min/sum is duplicated,
> but avg/count/last_value/first_value is ok.
>
>
>
>
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