[jira] [Assigned] (FLINK-24691) FLINK SQL SUM() causes a precision error

["Marios Trivyzas (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-24691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marios Trivyzas reassigned FLINK-24691:
---------------------------------------

    Assignee: Marios Trivyzas

> FLINK SQL SUM() causes a precision error
> ----------------------------------------
>
>                 Key: FLINK-24691
>                 URL: https://issues.apache.org/jira/browse/FLINK-24691
>             Project: Flink
>          Issue Type: Bug
>          Components: Table SQL / Runtime
>    Affects Versions: 1.14.0
>            Reporter: Zongwen Li
>            Assignee: Marios Trivyzas
>            Priority: Major
>
> code: 
> {code:java}
> tableEnv.executeSql("select sum(cast( 1.03520274 as decimal(32, 8))) as num ").print();
> {code}
> expected:
> 1.03520274
> actual:
> 1.03520270
>  
> This function is normal in version 1.13.x.
> I found the code that caused the inconsistency：
> org.apache.flink.table.types.logical.utils.LogicalTypeMerging#adjustPrecisionScale method was added in 1.14. Because sum() generates decimal(38,8) by default, it leads to special circumstances, which reduces the scale by 1.
>  



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