yiguolei opened a new issue, #17599:
URL: https://github.com/apache/doris/issues/17599

   ### Search before asking
   
   - [X] I had searched in the 
[issues](https://github.com/apache/doris/issues?q=is%3Aissue) and found no 
similar issues.
   
   
   ### Version
   
   1.2.2
   
   ### What's Wrong?
   
   mysql> alter table k7109_org_cust_bal1 modify column acct_id varchar(40);
   ERROR 1105 (HY000): errCode = 2, detailMessage = No key column left. 
index[k7109_org_cust_bal1]
   mysql> alter table k7109_org_cust_bal1 modify column acct_id varchar(40) key;
   ERROR 1105 (HY000): errCode = 2, detailMessage = Can not modify distribution 
column[acct_id]. index[k7109_org_cust_bal1]
   
   why not allow modify varchar's length?
   
   ### What You Expected?
   
   could alter 
   
   ### 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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