MySQL Bugs: #105350: Data insertion exception in version 8.0.27

Bug #105350	Data insertion exception in version 8.0.27
Submitted:	28 Oct 2021 2:06	Modified:	28 Oct 2021 2:13
Reporter:	tuantuan Xue	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server	Severity:	S3 (Non-critical)
Version:	8.0.27	OS:	Any
Assigned to:		CPU Architecture:	Any

Description:
We found a serious problem. When inserting with insert select statement, there are data exceptions。

How to repeat:

CREATE TABLE test(ID INT,FIELDNAME VARCHAR(100));
INSERT INTO test VALUES(1,'36245');

The result of the query is displayed：

SELECT 
  MAX(id)+1 ,
  '27141' id2
FROM
  test a 
  GROUP BY id2 ;

----------------------------------------
MAX(id)+1  id2     
---------  --------
        2  27141   

However, if you insert this result into the test table：
INSERT INTO test 
SELECT 
  MAX(id)+1 ,
  '27141' id2
FROM
  test a 
  GROUP BY id2 ;

select * from test;

    ID  FIELDNAME  
------  -----------
     1  36245      
(NULL)  27141      

The ID of the data inserted above turned out to be null

Suggested fix:
We changed the way we wrote the sentence, but it was correct：

INSERT INTO test 
SELECT 
  MAX(id+1),
  '27141' id2
FROM
  test a 
  GROUP BY id2

thx

Repetitive