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Informix - Problem description

Problem IT40875 Status: Closed

NESTED COLLECTION SUBQUERY RETURNING EMPTY WITH 'ORDER BY' ON MAIN QUERY

product:
INFORMIX SERVER / 5725A3900 / E10 - 
Problem description:
A collection subquery nested in another one would loose its
result set if an ORDER BY is placed on the main query.

Most simple example:

SELECT 'x' x , MULTISET ( SELECT MULTISET ( SELECT 'y' ) ) ms
ORDER BY 1;

should return (and does without the ORDER BY)

x   x
m  MULTISET{ROW(MULTISET{ROW('y')})}

yet returns

x   x
ms  MULTISET{ROW(MULTISET{})}
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC9.                 *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 14.10.xC9.                        *
****************************************************************
Local Fix:
Workaround:

SELECT 'x' x , MULTISET ( SELECT MULTISET ( SELECT 'y' )
)::lvarchar ms ORDER BY 1;
Solution
Workaround
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC9.                 *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 14.10.xC9.                        *
****************************************************************
Comment
Fixed in Informix Server 14.10.xC9.
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
09.05.2022
30.09.2022
30.09.2022
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)