huangyuansheng opened a new issue #8697:
URL: https://github.com/apache/incubator-doris/issues/8697


   ### Search before asking
   
   - [X] I had searched in the 
[issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and 
found no similar issues.
   
   
   ### Version
   
   Master of 2022-02-15
   
   ### What's Wrong?
   
   `create table test_a(a int) unique key(a) distributed by hash(a) buckets 1;`
   `create table test_b(b int) unique key(b) distributed by hash(b) buckets 1;`
   `create table test_c(c int) unique key(c) distributed by hash(c) buckets 1;`
   `insert into test_a select 1;`
   `insert into test_b select 2;`
   `insert into test_c select 3;`
   
   `select * from test_a full join test_b on (a = b) join test_c;`
   | a | b | c |
   |--|--|--|
   |1| | 3|
   || 2 | |
   
   `select * from (select * from test_a full join test_b on (a = b) ) t join 
test_c;`
   | a | b | c |
   |--|--|--|
   |1| | 3|
   || 2 | 3 |
   
   Results are not same!
   The second result is right!
   
   ### What You Expected?
   
   See above
   
   ### How to Reproduce?
   
   _No response_
   
   ### Anything Else?
   
   _No response_
   
   ### Are you willing to submit PR?
   
   - [ ] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of 
Conduct](https://www.apache.org/foundation/policies/conduct)
   


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