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https://issues.apache.org/jira/browse/DERBY-4490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797812#action_12797812
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Mamta A. Satoor commented on DERBY-4490:
----------------------------------------
I did little more testing with this and it appears that the select works when
there is only one row in the values table. eg
ij> select p, syscs_util.syscs_get_database_property(p) from (values
'DataDictionaryVersion') props(p);
P |2
------------------------------------------------------------------------------------------------------------------------------------------------------
DataDictionaryVersion|10.6
It also works when there is more than one row but they are the same property
''DataDictionaryVersion'' eg
ij> select p, syscs_util.syscs_get_database_property(p) from (values
'DataDictionaryVersion', 'DataDictionaryVersion') props(p);
P |2
------------------------------------------------------------------------------------------------------------------------------------------------------
DataDictionaryVersion|10.6
DataDictionaryVersion|10.6
But as Knut pointed out, when there are 2 rows (irrespective of the order of
the rows), we do not get correct value for 'DataDictionaryVersion'. eg
ij> select p, syscs_util.syscs_get_database_property(p) from (values
'DataDictionaryVersion', 'derby.database.collation') props(p);
P |2
---------------------------------------------------------------------------------------------------------------------------------------------------------
DataDictionaryVersion |NULL
derby.database.collation|UCS_BASIC
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
> 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
>
> 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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