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Optimization Strategies

Various optimization strategies used by the query optimizer.

Title	Description
DuplicateWeedout Strategy	DuplicateWeedout is an execution strategy for Semi-join subqueries
FirstMatch Strategy	FirstMatch is an execution strategy for Semi-join subqueries
LooseScan Strategy	LooseScan is an execution strategy for Semi-join subqueries
Semi-join Materialization Strategy	Semi-join Materialization is a subquery materialization used for Semi-join subqueries
Improvements to ORDER BY Optimization	Several Improvements to the ORDER BY Optimizer in Version 10.1 of MariaDB.

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https://mariadb.com/kb/en/optimization-strategies/