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https://issues.apache.org/jira/browse/DERBY-896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13903113#comment-13903113
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Lukas Eder commented on DERBY-896:
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That is great, thank you very much, guys!
> 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_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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