Details
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Bug
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Status: Closed (View Workflow)
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Critical
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Resolution: Fixed
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10.3.11, 5.5(EOL), 10.0(EOL), 10.1(EOL), 10.2(EOL), 10.3(EOL), 10.4(EOL), 10.5(EOL), 10.6, 10.7(EOL), 10.8(EOL), 10.9(EOL), 10.10(EOL), 10.11, 11.8
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Redhat el6
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Unexpected results
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Q3/2025 Maintenance, Q3/2026 Server Maintenance
Description
With the same select statement, it produces different results with optimizer_switch='derived_merge=ON'; and optimizer_switch='derived_merge=OFF';
Reproduce test case:
1. Follow the test_case.rtf attached, create table t1 and insert data into t1; create table t2 and insert data to t2.
2. Set optimizer_switch='derived_merge=ON'; and run the select statement. It has empty set result.
3. Set optimizer_switch='derived_merge=OFF'; and run the same select statement. It has result set:
+--------------------+------------+ |
| T_FP | Test_Value |
|
+--------------------+------------+ |
| 731834939448428685 | 22 |
|
+--------------------+------------+ |
Thanks,
KT Chow
