[jira] [Updated] (IGNITE-6383) SQL: review date/time format

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-6383?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov updated IGNITE-6383:
------------------------------------
    Labels: performance  (was: )

> SQL: review date/time format
> ----------------------------
>
>                 Key: IGNITE-6383
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6383
>             Project: Ignite
>          Issue Type: Task
>          Components: sql
>    Affects Versions: 2.1
>            Reporter: Vladimir Ozerov
>              Labels: performance
>
> Currently Ignite stores date as {{long}} and timestamp as {{long + int}}. This is rather compact form, however it is extremely inefficient for SQL operations requirind date parts, such as {{DAYOFF(...)}}. Moreover, it require costly conversions between {{long}} and {{java.util.Date}}.
> Probably we should review our date-time format. E.g. this is how Oracle format looks like (thanks to [~sergey.puchnin@gmail.com]):
> {code}
> timestamp '2015-07-31 08:55:06.157047'
> Typ=180 Len=11: 120,115,7,31,9,56,7,9,92,88,216
> Century: 120-100 = 20 centuries
> Year : 115-100 = 15 year in the 20th century
> Month: 7
> Day:31
> Hours: 9-1 =8
> minutes: 56 -1 = 55
> Seconds: 07 -1 = 06
> Fractions: 09,92,88,216 (dec) -> 09,5C,58,D8 (hex) = 0x095C58D8 -> 157047000 -> 0.157047
> {code}



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