Method print_explain_json_regular

sql/sql_explain.cc:789–847

*/

void Explain_union::print_explain_json_regular(
  Explain_query *query, Json_writer *writer, bool is_analyze)
{
  Json_writer_nesting_guard guard(writer);
  char table_name_buffer[SAFE_NAME_LEN];
  
  bool started_object= print_explain_json_cache(writer, is_analyze);

  writer->add_member("query_block").start_object();
  
  if (is_recursive_cte)
    writer->add_member("recursive_union").start_object();
  else
    writer->add_member("union_result").start_object();

  if (using_tmp)
  {
    make_union_table_name(table_name_buffer);
    writer->add_member("table_name").add_str(table_name_buffer);
    writer->add_member("access_type").add_str("ALL"); // not very useful

    /* r_loops (not present in tabular output) */
    if (is_analyze)
    {
      writer->add_member("r_loops").add_ll(
          fake_select_lex_tracker.get_loops());
    }

    /* `r_rows` */
    if (is_analyze)
    {
      writer->add_member("r_rows");
      if (fake_select_lex_tracker.has_scans())
        writer->add_double(fake_select_lex_tracker.get_avg_rows());
      else
        writer->add_null();
    }
  }
  writer->add_member("query_specifications").start_array();

  for (int i= 0; i < (int) union_members.elements(); i++)
  {
    writer->start_object();
    //writer->add_member("dependent").add_str("TODO");
    //writer->add_member("cacheable").add_str("TODO");
    Explain_select *sel= query->get_select(union_members.at(i));
    sel->print_explain_json(query, writer, is_analyze);
    writer->end_object();
  }
  writer->end_array();

  print_explain_json_for_children(query, writer, is_analyze);

  writer->end_object(); // union_result
  writer->end_object(); // query_block

  if (started_object)
    writer->end_object();