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From "Uwe L. Korn (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ARROW-553) C++: Faster valid bitmap building
Date Mon, 13 Feb 2017 08:33:41 GMT

     [ https://issues.apache.org/jira/browse/ARROW-553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uwe L. Korn updated ARROW-553:
------------------------------
    Summary: C++: Faster valid bitmap building  (was: C++: Faster null bitmap building)

> C++: Faster valid bitmap building
> ---------------------------------
>
>                 Key: ARROW-553
>                 URL: https://issues.apache.org/jira/browse/ARROW-553
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Uwe L. Korn
>            Assignee: Uwe L. Korn
>
> Currently we build up the bitmaps bit-by-bit which takes very long. Instead we can build
them byte-by-byte in the general case and use {{memset}} for the non-null case.



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