Method contains

sql/sql_db.cc:160–167

  }

  bool contains(const char *s)
  {
    auto sz= strlen(s);
    mysql_rwlock_rdlock(&m_lock);
    bool ret= m_set.find(s, sz) != 0;
    mysql_rwlock_unlock(&m_lock);
    return ret;
  }

  void insert(const char *s)
  {