tidb courses: day9

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--SQL--> Parser --AST--> logical optimizer
                                              |
                                              |
                                           logical Plan
                                              |
                                              V
<--result -- root executor <-physical plan--  physical optimizer
    |----------------------                   ^
    |                     |                   |
    V                     Feedback           cardinality estimation
    DistSQL               |                    |
    |                     V                    |
    |                     statistics-----------
    CopTask
    |
    V
    TiKV ....(表示多个)