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https://issues.apache.org/jira/browse/SPARK-17494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504803#comment-15504803
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Apache Spark commented on SPARK-17494:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/15154
> Floor/ceil of decimal returns wrong result if it's in compact format
> --------------------------------------------------------------------
>
> Key: SPARK-17494
> URL: https://issues.apache.org/jira/browse/SPARK-17494
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.1, 2.0.0
> Reporter: Gokhan Civan
> Assignee: Davies Liu
> Labels: correctness
>
> If you create tables as follows:
> create table a as select 'A' as str, cast(10.5 as decimal(15,6)) as num;
> create table b as select 'A' as str;
> Then
> select floor(num) from a;
> returns 10
> but
> select floor(num) from a join b on a.str = b.str;
> returns 11
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