Algebraic optimization strategy
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2020-03-01 22:32:28
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- The early implementation of the selection operation
Objective: To reduce intermediate relations
- Projection and selection operations are performed simultaneously
Objective: Relationship to avoid rescanning
- Front and rear projection and binary operator binding
several times to reduce the scanning relationship: object
- Cartesian product selection and combination of the foregoing to perform a join operation becomes
- Find common subexpression
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