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From Sergio Peña (JIRA) <j...@apache.org>
Subject [jira] [Updated] (HIVE-7373) Hive should not remove trailing zeros for decimal numbers
Date Thu, 14 Aug 2014 19:52:19 GMT

     [ https://issues.apache.org/jira/browse/HIVE-7373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergio Peña updated HIVE-7373:
------------------------------

    Status: Open  (was: Patch Available)

cancel patch because avro_decimal filed tests

> 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: 0.13.1, 0.13.0
>            Reporter: Xuefu Zhang
>            Assignee: Sergio Peña
>         Attachments: HIVE-7373.1.patch, HIVE-7373.2.patch, HIVE-7373.3.patch, HIVE-7373.4.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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