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From "Jason Dere (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12063) Pad Decimal numbers with trailing zeros to the scale of the column
Date Wed, 28 Oct 2015 21:26:28 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14979273#comment-14979273
] 

Jason Dere commented on HIVE-12063:
-----------------------------------

We should at have some way to alert users about this change as it affects the output of the
results. There are some users that complain about Hive's existing Decimal formatting because
it looks different from other RDBMS when trying to validate results, I'm sure there may be
some people that will want to know if the HIve format changes. I guess it can also go into
the release notes section of this Jira.

> Pad Decimal numbers with trailing zeros to the scale of the column
> ------------------------------------------------------------------
>
>                 Key: HIVE-12063
>                 URL: https://issues.apache.org/jira/browse/HIVE-12063
>             Project: Hive
>          Issue Type: Improvement
>          Components: Types
>    Affects Versions: 0.14.0, 1.0.0, 1.2.0, 1.1.0, 0.13
>            Reporter: Xuefu Zhang
>            Assignee: Xuefu Zhang
>         Attachments: HIVE-12063.1.patch, HIVE-12063.2.patch, HIVE-12063.patch
>
>
> HIVE-7373 was to address the problems of trimming tailing zeros by Hive, which caused
many problems including treating 0.0, 0.00 and so on as 0, which has different precision/scale.
Please refer to HIVE-7373 description. However, HIVE-7373 was reverted by HIVE-8745 while
the underlying problems remained. HIVE-11835 was resolved recently to address one of the problems,
where 0.0, 0.00, and so on cannot be read into decimal(1,1).
> However, HIVE-11835 didn't address the problem of showing as 0 in query result for any
decimal values such as 0.0, 0.00, etc. This causes confusion as 0 and 0.0 have different precision/scale
than 0.
> The proposal here is to pad zeros for query result to the type's scale. This not only
removes the confusion described above, but also aligns with many other DBs. Internal decimal
number representation doesn't change, however.



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