message: Serialise two column expressions
diff: @@ -1939,6 +1939,24 @@ public:
  do_verify_column(m_getter2.m_column, m_condition_column_idx2);
  }
  + virtual std::string describe_column() const override
  + {
  + REALM_ASSERT(m_condition_column != nullptr);
  + return ParentNode::describe_column(m_condition_column->get_column_index());
  + }
  +
  + virtual std::string describe() const override
  + {
  + REALM_ASSERT(m_getter1.m_column != nullptr && m_getter2.m_column != nullptr);
  + return ParentNode::describe_column(m_getter1.m_column->get_column_index()) + " " + describe_condition() + " "
  + + ParentNode::describe_column(m_getter2.m_column->get_column_index());
  + }
  +
  + virtual std::string describe_condition() const override
  + {
  + return TConditionFunction::description();
  + }
  +
  void init() override
  {
  ParentNode::init();
  