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Posted to issues@kylin.apache.org by "Chao Long (JIRA)" <ji...@apache.org> on 2018/07/19 07:21:00 UTC

[jira] [Resolved] (KYLIN-3186) Add support for partitioning columns that combine date and time (e.g. YYYYMMDDHHMISS)

     [ https://issues.apache.org/jira/browse/KYLIN-3186?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chao Long resolved KYLIN-3186.
------------------------------
    Resolution: Fixed

> Add support for partitioning columns that combine date and time (e.g. YYYYMMDDHHMISS)
> -------------------------------------------------------------------------------------
>
>                 Key: KYLIN-3186
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3186
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Others
>    Affects Versions: v2.2.0
>            Reporter: Vsevolod Ostapenko
>            Assignee: Chao Long
>            Priority: Major
>             Fix For: v2.5.0
>
>
> In a multitude of existing enterprise applications partitioning is done on a single column that fuse date and time into a single value (string, integer or big integer). Typical formats are YYYYMMDDHHMM or  YYYYMMDDHHMMSS (e.g. 201801181621 and 20180118154734).
> Such representation is human readable and provides natural sorting of the date/time values.
> Lack of support for such date/time representation requires some ugly workarounds, like creating views that split date and time into separate columns or data copying into tables with different partitioning scheme, none of which is a particularly good solution.
> More over, using views approach on Hive causes severe performance issues, due to inability of Hive optimizer correctly analyze filtering conditions auto-generated by Kylin during the flat table build step.



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