mymeiyi opened a new pull request, #27637:
URL: https://github.com/apache/doris/pull/27637

   …ectly
   
   ## Proposed changes
   
   For insert into values, we can write `\N` string to a column.
   ```
   insert into t2 values(1, '"b"', 100);
   insert into t2 values(2, '\N', 100);
   insert into t2 values(3, '\\N', 100);
   
   mysql> select * from t2 where name is null;
   Empty set (0.03 sec)
   ```
   
   But txn insert and group commit insert use stream load as the inner 
implementation, the `\N` means `null`, so the write result is not correct.
   ```
   begin;
   insert into t2 values(1, '"b"', 100);
   insert into t2 values(2, '\N', 100);
   insert into t2 values(3, '\\N', 100);
   commit;
   
   mysql> select * from t2 where name is null;
   +------+------+-------+
   |     id    |  name | score  |
   +------+------+-------+
   |    3      | NULL |   100    |
   +------+------+-------+
   1 row in set (0.02 sec)
   ```
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   
   


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