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Posted to dev@hive.apache.org by "Xuefu Zhang (JIRA)" <ji...@apache.org> on 2014/07/09 17:41:11 UTC
[jira] [Updated] (HIVE-7373) Hive should not remove trailing zeros
for decimal numbers
[ https://issues.apache.org/jira/browse/HIVE-7373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xuefu Zhang updated HIVE-7373:
------------------------------
Description:
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.
was:
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. With this, in above example, 0.0, 0.00, and 0.0000 will be represented as 0.0 (precision=1, scale=1) internally.
> 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: Xuefu Zhang
>
> 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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