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InnoDB could return off-by-1 estimates for the involved tables.
This would cause off-by-many difference in join output cardinality
for the top-level SELECT, and so different query plan for the subquery.
The fix: Introduce mysql-test/include/innodb_stable_estimates.{inc,opt}
which disables InnoDB's background statistics collection, and use it.
12 lines
531 B
C++
12 lines
531 B
C++
#
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# Include this file in your .test file if your testcase uses InnoDB tables
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# requiring stable query plans, which likely requires that InnoDB produces
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# stable estimates for #records in tables.
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#
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# How it works:
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# Unstable InnoDB estimates are caused by InnoDB's background statistics
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# collection. When you include this file, MTR will use server options from
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# include/innodb_stable_estimates.opt, which disables background statistics
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# collection.
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# (and no, InnoDB team objects to using this configuration for all MTR tests)
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#
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