DisableChosenPlan initial probing may break mysqltest simplification

Bug #897620 reported by Philip Stoev
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Random Query Generator

Bug Description

The DisableChosenPlan Validator performs initial probing of server capabilities by using SET SESSION optimizer_switch=...' to determine which options are supported.

If the CSV log is converted into an MTR test case, those SET SESSIONs will end up in the test and influence the outcome and speed of execution.

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