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Wrong Results Possible on 10.2 When New "HASH GROUP BY" Feature is Used (Doc ID 387958.1)

Last updated on FEBRUARY 12, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.1 to 10.2.0.2 [Release 10.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
All queries with GROUP BYs clauses


Symptoms

Wrong results possible from the result of a non-distinct aggregation with a group by (such as sum(col)) when HASH GROUP BY is used.
Incorrect results from aggregation functions with a group by that uses the new "HASH GROUP BY" functionality.
The wrong results show as missing values from the aggregate.




Cause

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In this Document
Symptoms
Cause
Solution
References

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