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From "Karen Coppage (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-22763) 0 is accepted in 12-hour format during timestamp cast
Date Wed, 26 Feb 2020 15:00:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-22763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17045604#comment-17045604
] 

Karen Coppage commented on HIVE-22763:
--------------------------------------

Thanks [~belugabehr]!

> 0 is accepted in 12-hour format during timestamp cast
> -----------------------------------------------------
>
>                 Key: HIVE-22763
>                 URL: https://issues.apache.org/jira/browse/HIVE-22763
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2
>            Reporter: Karen Coppage
>            Assignee: Karen Coppage
>            Priority: Minor
>             Fix For: 4.0.0
>
>         Attachments: HIVE-22763.01.patch, HIVE-22763.01.patch, HIVE-22763.01.patch, HIVE-22763.01.patch,
HIVE-22763.01.patch, HIVE-22763.01.patch, HIVE-22763.02.patch, HIVE-22763.03.patch, HIVE-22763.04.patch,
HIVE-22763.04.patch
>
>
> Having a timestamp string in 12-hour format can be parsed if the hour is 0, however,
based on the [design document|https://docs.google.com/document/d/1V7k6-lrPGW7_uhqM-FhKl3QsxwCRy69v2KIxPsGjc1k/edit],
it should be rejected.
> h3. How to reproduce
> Run {code}select cast("2020-01-01 0 am 00" as timestamp format "yyyy-mm-dd hh12 p.m.
ss"){code}
> It shouldn' t be parsed, as the hour component is 0.
> h3. Spec
> ||Pattern||Meaning||Additional details||
> |HH12|Hour of day (1-12)|Same as HH|
> |HH|Hour of day (1-12)|{panel:borderStyle=none}
> - One digit inputs are possible in a string to datetime conversion but needs to be surrounded
by separators.
> - In a datetime to string conversion one digit hours are prefixed with a zero.
> - Error if provided hour is not between 1 and 12.
> - Displaying an unformatted timestamp in Impala uses the HH24 format regardless if it
was created using HH12.
> - If no AM/PM provided then defaults to AM.
> - In string to datetime conversion, conflicts with SSSSS and HH24.{panel:borderStyle=none}|



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