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Date: Wed, 26 Feb 2014 22:08:23 +0000 (UTC)
From: "Myrna van Lunteren (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Message-ID: <JIRA.12328331.1138742407000.112621.1393452503671@arcas>
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Subject: [jira] [Commented] (DERBY-896) Cast date to timestamp results in
 "ERROR 42846: Cannot convert types 'DATE' to 'TIMESTAMP'."
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    [ https://issues.apache.org/jira/browse/DERBY-896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13913587#comment-13913587 ] 

Myrna van Lunteren commented on DERBY-896:
------------------------------------------

It appears from the previous discussion that this is something that should've been allowed as per the SQL Standard, so I'd think it a good one to backport, at least to 10.10...

> Cast date to timestamp results in "ERROR 42846: Cannot convert types 'DATE' to 'TIMESTAMP'."
> --------------------------------------------------------------------------------------------
>
>                 Key: DERBY-896
>                 URL: https://issues.apache.org/jira/browse/DERBY-896
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.1.2.1
>         Environment: --------- Derby Information --------
> JRE - JDBC: J2SE 1.4.2 - JDBC 3.0
> [D:\Programme\Derby\bin\lib\derby.jar] 10.1.2.1 - (330608)
> [D:\Programme\Derby\bin\lib\derbytools.jar] 10.1.2.1 - (330608)
>            Reporter: Oleksandr Alesinskyy
>            Assignee: Knut Anders Hatlen
>              Labels: derby_backport_reject_10_10, derby_triage10_5_2
>             Fix For: 10.11.0.0
>
>         Attachments: allow-casts-with-tests.diff, allow-casts.diff, w.sql
>
>
> Cast date  to timestamp results in "ERROR 42846: Cannot convert types 'DATE' to 'TIMESTAMP'.",
> e.g. in ij:
> select cast(cast ('2006-01-01' as date) as timestamp) from sys.sysschemas;
> or
> select cast (current_date as timestamp) from bradi_dat.lpaip01;
> The similar issue exists for time ("ERROR 42846: Cannot convert types 'TIME' to 'TIMESTAMP'.",
> Documentation clearly states that these conversions are allowed, see table 1 in a description of CAST function in the Derby Reference Manual and comment about "Conversion of date/time values" below that table (see below as well).
> Conversions of date/time values
> A date/time value can always be converted to and from a TIMESTAMP. If a DATE is
> converted to a TIMESTAMP, the TIME component of the resulting TIMESTAMP is always
> 00:00:00. If a TIME data value is converted to a TIMESTAMP, the DATE component is
> set to the value of CURRENT_DATE at the time the CAST is executed. If a TIMESTAMP
> is converted to a DATE, the TIME component is silently truncated. If a TIMESTAMP is
> converted to a TIME, the DATE component is silently truncated.
>   


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