public void Match <TT, TTDiscard>(Action <LeftJoinNode <TT, TTDiscard> > callback)
where TT : class
{
var self = this.CastAs <DiscardRuleNodeSelector <Token <TT, TTDiscard>, TDiscard> >();
if (_node == null)
{
_left.Match <T, TDiscard>(leftJoin => { _node = leftJoin; });
}
_configurator.MatchLeftJoinNode(self._node, callback);
}