Wrong Result when Fix for Bug 21099502 is Present on a Query which Uses UNION View and GROUP BY Clause
(Doc ID 2536136.1)
Last updated on APRIL 17, 2023
Applies to:
Oracle Database - Enterprise Edition - Version 11.2.0.4 and laterOracle Database - Standard Edition - Version 11.2.0.4 and later
Information in this document applies to any platform.
Symptoms
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Wrong result may be seen when the fix to bug 21099502 is present on a query which uses UNION view whose branches have GROUP BY clause, and there is a predicate in the outer query block.
Example:
SELECT
T1.COL1
FROM
T1,
( SELECT COL1,
COL2
FROM T1
WHERE COL3 = 1
UNION
SELECT COL1,
MAX(COL2)
FROM T1
WHERE COL3 = 2
GROUP BY COL1 ) SUB
WHERE
T1.COL1 = SUB.COL1 AND
T1.COL2 = SUB.COL2 AND
T1.COL1 in ('1','2','3','4');
SELECT
T1.COL1
FROM
T1,
( SELECT COL1,
COL2
FROM T1
WHERE COL3 = 1
UNION
SELECT COL1,
MAX(COL2)
FROM T1
WHERE COL3 = 2
GROUP BY COL1 ) SUB
WHERE
T1.COL1 = SUB.COL1 AND
T1.COL2 = SUB.COL2 AND
T1.COL1 in ('1','2','3','4');
Changes
None
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |