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https://issues.apache.org/jira/browse/HIVE-7373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14105514#comment-14105514
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Sergio Peña commented on HIVE-7373:
-----------------------------------
[~leftylev] Here's the statement.
Does it need more explanation or examples?
"Prior to 0.14, Hive used to trim trailing zeros for decimal numbers.
Currently, the trailing zeros are preserved up to what the scale allows
(HIVE-7373)."
> Hive should not remove trailing zeros for decimal numbers
> ---------------------------------------------------------
>
> Key: HIVE-7373
> URL: https://issues.apache.org/jira/browse/HIVE-7373
> Project: Hive
> Issue Type: Bug
> Components: Types
> Affects Versions: 0.13.0, 0.13.1
> Reporter: Xuefu Zhang
> Assignee: Sergio Peña
> Labels: TODOC14
> Fix For: 0.14.0
>
> Attachments: HIVE-7373.1.patch, HIVE-7373.2.patch, HIVE-7373.3.patch,
> HIVE-7373.4.patch, HIVE-7373.5.patch, HIVE-7373.6.patch, HIVE-7373.6.patch
>
>
> Currently Hive blindly removes trailing zeros of a decimal input number as
> sort of standardization. This is questionable in theory and problematic in
> practice.
> 1. In decimal context, number 3.140000 has a different semantic meaning from
> number 3.14. Removing trailing zeroes makes the meaning lost.
> 2. In a extreme case, 0.0 has (p, s) as (1, 1). Hive removes trailing zeros,
> and then the number becomes 0, which has (p, s) of (1, 0). Thus, for a
> decimal column of (1,1), input such as 0.0, 0.00, and so on becomes NULL
> because the column doesn't allow a decimal number with integer part.
> Therefore, I propose Hive preserve the trailing zeroes (up to what the scale
> allows). With this, in above example, 0.0, 0.00, and 0.0000 will be
> represented as 0.0 (precision=1, scale=1) internally.
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