void BuildSql(SingleOperationNode leftMember, Node rightMember, ExpressionType op)
 {
     if (leftMember.Operator == ExpressionType.Not)              
         BuildSql(leftMember as Node, rightMember, op);
     else
         BuildSql((dynamic)leftMember.Child, (dynamic)rightMember, op);
 }
 void BuildSql(Node leftMember, SingleOperationNode rightMember, ExpressionType op)
 {
     BuildSql(rightMember, leftMember, op);
 }
 void BuildSql(string field_type, SingleOperationNode node)
 {
     if(node.Operator == ExpressionType.Not)
         _builder.Not();
     BuildSql(field_type, node.Child);
 }
 void BuildSql(SingleOperationNode node)
 {
     if(node.Operator == ExpressionType.Not)
         _builder.Not();
     BuildSql(node.Child);
 }