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MDEV-27306: SET STATEMENT optimizer_trace=1 Doesn't save the trace
In mysql_execute_command(), move optimizer trace initialization to be after run_set_statement_if_requested() call. Unfortunately, mysql_execute_command() code uses "goto error" a lot, and this means optimizer trace code cannot use RAII objects. Work this around by: - Make Opt_trace_start a non-RAII object, add init() method. - Move the code that writes the top-level object and array into Opt_trace_start::init().
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