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https://issues.apache.org/jira/browse/SPARK-17494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15484952#comment-15484952
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Josh Rosen commented on SPARK-17494:
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This also seems to affect Spark 2.0, except there it always returns {{11}} when
selecting a floor of {{num}}, while taking the floor of a casted literal seems
to work as expected.
Specifically,
{code}
select floor(cast(10.5 as decimal(15,6))), num, floor(num) from a
{code}
returns {{10, 10.5, 11}}.
> Floor function rounds up during join
> ------------------------------------
>
> 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
> 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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