Parallel Query Returns Wrong Results (Fewer Rows) When CONCATENATION In Plan

(Doc ID 1352777.1)

Last updated on MARCH 27, 2014

Applies to:

Oracle Server - Enterprise Edition - Version: 11.2.0.2 and later   [Release: 11.2 and later ]
Information in this document applies to any platform.

Symptoms

A parallel query returned wrong results (fewer rows) after upgrading from 10.2.0.5 to 11.2.0.2.

The wrong-results plan showed both a serial and parallel branch under the CONCATENATION operation.

Turning off fix control for Bug 9732434 verified the match to this bug:

alter session set "_fix_control" = '9732434:OFF';
<run query>

Changes

Upgrade from 10.2.0.5 to 11.2.0.2.

Cause

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