# Quiz

+ Is the following description of the optimizer process correct? (Select 2)
  + `A` . After generating the execution plan, push it down directly to the SQL executor if it is a click
  + `B` . Physical optimization needs to be combined with statistical information
  + `C` . The product of logical optimization is a syntax tree (AST)
  + `D` . The following is the correct order: SQL parse -> Logical Optimization -> Physical Optimization -> SQL Executor

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B, D