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

["Vsevolod Ostapenko (JIRA)" <ji...@apache.org>]

Vsevolod Ostapenko created KYLIN-3186:
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             Summary: 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: General
    Affects Versions: v2.2.0
            Reporter: Vsevolod Ostapenko


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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