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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3341) TABLE FUNCTION returning CHAR values does not return a correct value if the Java ResultSet class returns a value less than the length of the defined CHAR.
Date Wed, 05 Mar 2008 17:21:40 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575426#action_12575426
] 

Daniel John Debrunner commented on DERBY-3341:
----------------------------------------------

I haven't looked in detail at the patch but the approach seems unusual to me. The passing
of the return types as a string and then unpacking it at execution time seems more like compile
time work. Standard functions use a CastNode (ie. operation all figured out at compile time)
to perform conversions. That or a NormalizeResultSet would seem more in line with existing
code.

> TABLE FUNCTION returning CHAR values does not return a correct value if the Java ResultSet
class returns a value less than the length of the defined CHAR.
> ----------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3341
>                 URL: https://issues.apache.org/jira/browse/DERBY-3341
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Daniel John Debrunner
>             Fix For: 10.4.0.0
>
>         Attachments: derby-3341-01-coerce.diff, derby_3341_test.txt
>
>
> Defining a column in the returned type as CHAR(10) requires that the returned value be
of length 10 characters.
> Defining a table function with a return type of:
>    returns TABLE  column0 char( 10 ), column1 char( 10 ))
> seems to just return whatever the Java ResultSet implementation handed it.
> My guess this is true for all variable length types, no casting of the value occurs when
it is returned to the SQL domain.
> Java single value functions and procedure out parameters do perform any required casting
to ensure the value is of the declared type.

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