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https://issues.apache.org/jira/browse/DERBY-4490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12800672#action_12800672
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Knut Anders Hatlen commented on DERBY-4490:
-------------------------------------------
Perhaps the underlying bug is not that get_database_property doesn't strip away
trailing blanks, but rather that VALUES 'a', 'ab', 'abc' actually returns 'a
', 'ab ', 'abc'.
ij> select x, length(x) from (values 'a','ab','abc') v(x);
X |2
---------------
a |3
ab |3
abc|3
3 rows selected
My initial expectation was that it should return 1,2,3 instead of 3,3,3, but
that expectation could be wrong. If the above query result is correct, I would
be inclined to say that this bug report is invalid, because I was actually
asking for the database property 'DataDictionaryVersion ', so NULL is the
expected result.
I guess this then boils down to whether
VALUES 'a', 'ab', 'abc'
should return CHAR(3) or VARCHAR(3). I would have to consult the SQL standard
to know for sure.
> SYSCS_UTIL.SYSCS_GET_DATABASE_PROPERTY unexpectedly returns NULL when used in
> SELECT
> ------------------------------------------------------------------------------------
>
> Key: DERBY-4490
> URL: https://issues.apache.org/jira/browse/DERBY-4490
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.5.3.0, 10.6.0.0
> Reporter: Knut Anders Hatlen
> Assignee: Mamta A. Satoor
> Attachments: DERBY4490_null_database_property_diff_patch1.txt,
> DERBY4490_null_database_property_stat_patch1.txt
>
>
> I see the following values returned when invoking
> SYSCS_UTIL.SYSCS_GET_DATABASE_PROPERTY on its own:
> ij> values syscs_util.syscs_get_database_property('derby.database.collation');
> 1
> --------------------
> UCS_BASIC
> 1 row selected
> ij> values syscs_util.syscs_get_database_property('DataDictionaryVersion');
> 1
> ---------------------
> 10.6
> 1 row selected
> But when I query both properties at the same time, DataDictionaryVersion
> comes out as NULL:
> ij> select p, syscs_util.syscs_get_database_property(p) from (values
> 'derby.database.collation', 'DataDictionaryVersion') props(p);
> P |2
> ------------------------------------------------------------
> derby.database.collation|UCS_BASIC
> DataDictionaryVersion |NULL
> 2 rows selected
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