Function add_json_keyset

sql/sql_explain.cc:1904–1910

static
void add_json_keyset(Json_writer *writer, const char *elem_name,
                     String_list *keyset)
{
  if (!keyset->is_empty())
    print_json_array(writer, elem_name, *keyset);
}


void Explain_rowid_filter::print_explain_json(Explain_query *query,