Method print_explain

sql/sql_lex.cc:6220–6250

*/

int LEX::print_explain(select_result_sink *output, uint8 explain_flags,
                       bool is_analyze, bool is_json_format,
                       bool *printed_anything)
{
  int res;
  if (explain && explain->have_query_plan())
  {
    if (is_json_format)
    {
      auto now= microsecond_interval_timer();
      auto start_time= thd->start_utime;
      auto query_time_in_progress_ms= 0ULL;
      if (likely(now > start_time))
        query_time_in_progress_ms=
          (now - start_time) / (HRTIME_RESOLUTION / 1000);
      res= explain->print_explain_json(output, is_analyze,
                                       query_time_in_progress_ms);
    }
    else
    {
      res= explain->print_explain(output, explain_flags, is_analyze);
    }
    *printed_anything= true;
  }
  else
  {
    res= 0;
    *printed_anything= false;
  }
  return res;
}


/**