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Informix - Problem description

Problem IT37421 Status: Closed

Wrong result for aggregate query via index - MIN for example - when NULL
contained in column alongside non-NULL data

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
When a select min ( column ) is used and the table contains a
NULL value in the result set, the query returns different
results depending on using a sequential scan or a index scan

select  --+ index ( t1 )
nvl(min(b),'isnull') from t1 where a in (2,3);
select  --+ full ( t1 )
nvl(min(b),'isnull') from t1 where a in (2,3);

(expression)
isnull
1 row(s) retrieved.

(expression)
2
1 row(s) retrieved.

This problem started appearing in 12.10.xC14 and 14.10.xC4.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server 12.10.xC14 and 14.10.xC4 - xC6.     *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 or 14.10.xC7 (when     *
* available).                                                  *
****************************************************************
Local Fix:
Solution
Workaround
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server 12.10.xC14 and 14.10.xC4 - xC6.     *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 or 14.10.xC7 (when     *
* available).                                                  *
****************************************************************
Comment
Fixed in Informix Server 12.10.xC15 and 14.10.xC7.
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
25.06.2021
31.08.2021
31.08.2021
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Problem solved according to the fixlist(s) of the following version(s)
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