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https://issues.apache.org/jira/browse/DERBY-4490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12800673#action_12800673
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Knut Anders Hatlen commented on DERBY-4490:
-------------------------------------------
As another data point, here's what PostgreSQL responds to the query:
# select x, length(x) from (values ('a'),('ab'),('abc')) v(x);
x | length
-----+--------
a | 1
ab | 2
abc | 3
(3 rows)
> 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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