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https://issues.apache.org/jira/browse/TAJO-1019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyunsik Choi updated TAJO-1019:
-------------------------------
Assignee: Jihun Kang
> Rounding Errors in Floating Point Arithmetic
> --------------------------------------------
>
> Key: TAJO-1019
> URL: https://issues.apache.org/jira/browse/TAJO-1019
> Project: Tajo
> Issue Type: Improvement
> Environment: Ubuntu 14.04
> Hadoop 2.4.1
> Reporter: Jihun Kang
> Assignee: Jihun Kang
> Priority: Minor
> Attachments: float8dotum_minus.patch
>
>
> Floating point rounding errors are found when executing some statement on
> cli. When running math functions with this floating point number, results
> will be varied based on which JVM "Math" implementation used.
> default> select 0.8-0.1;
> ?minus
> -------------------------------
> 0.7000000000000001
> (1 rows, 0.067 sec, 0 B selected)
> With a modified Float8Dotum class, SQL result will be shown like this.
> default> select 0.8-0.1;
> ?minus
> -------------------------------
> 0.7
> (1 rows, 0.004 sec, 0 B selected)
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