update/upsert issues

[panda-sheep]

three questions in nebula 1.0

case 1
create tag t1 (a int , b int default 1);
upsert vertex 5 set t1.a = 1, t1.b = $^.t1.a + 1;
The upsert statement should be executed successfully, but currently it has failed
The reason is that` b = $^.t1.a + 1 `requires `a` to have a default value, which is wrong

case 2
create edge e1 (c  int , d int default 1);
upsert edge  111 -> 222@0 of e1  set  c= 3,  d = e1.c+ 10;
The upsert statement should be executed successfully, but currently it has failed
The reason is that` d = e1.c+ 10 `  requires` c`  to have a default value, which is wrong

case 3
update/upsert edge 111->333 @0 of e1 set  c = 1,  d = $^.t1.a; 
$^ is different in the forward edge and the reverse edge
$^ in the positive edge is 5
$^ in the reverse edge is 10002
Cause the properties of the forward and reverse edges to be inconsistent.
Therefore, tag properties are not allowed in the` set clause` and `when clause` in update edge



case 1 and case 2  case 3   are ok in   2.0 

[CPWstatic]

We had improve the update/upsert logic in version 2.0. This issue remains no longer. And i'll close the related pr since it would not be fixed in version 1.0.