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MySQL 8.4 Reference Manual  /  ...  /  Optimizer Trace Implementation

10.15.16 Optimizer Trace Implementation

See the files sql/opt_trace*, starting with sql/opt_trace.h. A trace is started by creating an instance of Opt_trace_start; information is added to this trace by creating instances of Opt_trace_object and Opt_trace_array, and by using the add() methods of these classes.