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static sys_var_session_uint32_t sys_optimizer_search_depth(&vars, "optimizer_search_depth",
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&SV::optimizer_search_depth);
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const char *optimizer_use_mrr_names[] = {"auto", "force", "disable", NULL};
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static sys_var_session_uint64_t sys_preload_buff_size(&vars, "preload_buffer_size",
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static sys_var_session_uint32_t sys_read_buff_size(&vars, "read_buffer_size",