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From "Josh Rosen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-17494) Floor function rounds up during join
Date Mon, 12 Sep 2016 18:52:20 GMT

    [ https://issues.apache.org/jira/browse/SPARK-17494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15484952#comment-15484952
] 

Josh Rosen commented on SPARK-17494:
------------------------------------

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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