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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HIVE-5800) Hive is inconsistent when handling strings in arithmetic operations
Date Mon, 09 Dec 2013 21:40:07 GMT

     [ https://issues.apache.org/jira/browse/HIVE-5800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xuefu Zhang resolved HIVE-5800.
-------------------------------

       Resolution: Fixed
    Fix Version/s: 0.13.0

> Hive is inconsistent when handling strings in arithmetic operations
> -------------------------------------------------------------------
>
>                 Key: HIVE-5800
>                 URL: https://issues.apache.org/jira/browse/HIVE-5800
>             Project: Hive
>          Issue Type: Bug
>          Components: Types
>    Affects Versions: 0.12.0
>            Reporter: Xuefu Zhang
>            Assignee: Xuefu Zhang
>             Fix For: 0.13.0
>
>
> Currently Hive is inconsistent in dealing with strings involved in arithmetic operations.
For instance:
> {code}
> hive> desc test;
> OK
> i                   	int                 	None                
> b                   	boolean             	None                
> d                   	double              	None                
> s                   	string              	None                
> dec                 	decimal(5,2)        	None                
> Hive> explain select dec/s from test;
> ...
> STAGE PLANS:
>   Stage: Stage-1
>     Map Reduce
>       Alias -> Map Operator Tree:
>         test 
>           TableScan
>             alias: test
>             Select Operator
>               expressions:
>                     expr: (dec / s)
>                     type: decimal(65,30)
>               outputColumnNames: _col0
> hive> explain select dec*s from test;
> ...
> STAGE PLANS:
>   Stage: Stage-1
>     Map Reduce
>       Alias -> Map Operator Tree:
>         test 
>           TableScan
>             alias: test
>             Select Operator
>               expressions:
>                     expr: (dec * s)
>                     type: double
> {code}
> MySQL consistently treats string in arithmetic operations as double (not an exact numeric
type) and derives the operator result type accordingly. Hive should also be consistent.
> {code}
> {code}



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