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From "Jacky Li (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CARBONDATA-1429) Add a value based compression for decimal data type when decimal is stored as Int or Long
Date Fri, 15 Sep 2017 09:26:00 GMT

     [ https://issues.apache.org/jira/browse/CARBONDATA-1429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jacky Li resolved CARBONDATA-1429.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 1.2.0

> Add a value based compression for decimal data type when decimal is stored as Int or
Long
> -----------------------------------------------------------------------------------------
>
>                 Key: CARBONDATA-1429
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-1429
>             Project: CarbonData
>          Issue Type: Improvement
>            Reporter: Manish Gupta
>            Assignee: Manish Gupta
>            Priority: Minor
>             Fix For: 1.2.0
>
>          Time Spent: 7h
>  Remaining Estimate: 0h
>
> Added a value based compression for decimal data type when decimal is stored as Int or
Long
> When decimal precision is <= 9, decimal values are stored in 4 bytes but they are
not compressed further based on min and max values as compared with other primitive data type
compression. Therefore now based on min and max value decimal data falling in Integer range
will be further compressed as byte or short.
> When decimal precision is <= 18, decimal values are stored in 8 bytes but they are
not compressed further based on min and max values as compared with other primitive data type
compression. Therefore now based on min and max value decimal data falling in Long range will
be further compressed as byte, short or int.
> Advantage: This will reduce the storage space thereby decreasing the IO time while reading
and decompressing the data.



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