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https://issues.apache.org/jira/browse/FLINK-24691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17435830#comment-17435830
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Zongwen Li edited comment on FLINK-24691 at 10/29/21, 7:59 AM:
---------------------------------------------------------------
[~matriv]
org.apache.flink.table.types.logical.utils.LogicalTypeMerging#adjustPrecisionScale
method was added in 1.14. Because sum() generates max precision(38) by
default, it leads to special circumstances, which reduces the scale by 1.
was (Author: ashulin):
[~matriv]
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.
> 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
> Attachments: image-2021-10-29-15-49-14-419.png
>
>
> 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 max precision(38) by
> default, it leads to special circumstances, which reduces the scale by 1.
> !image-2021-10-29-15-49-14-419.png!
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