[GitHub] [incubator-doris] HangyuanLiu opened a new issue #1920: Alter column to null throw exception "Cannot shorten string length"

[GitBox <gi...@apache.org>]

HangyuanLiu opened a new issue #1920: Alter column to null throw exception "Cannot shorten string length"
URL: https://github.com/apache/incubator-doris/issues/1920
 
 
   **Describe the bug**
   When I was doing the schema change operation, I wanted to change the non-null type to the nullable type, but I received an exception "Cannot shorten string length"
   
   **To Reproduce**
   **1、**
   CREATE TABLE `test_uv_21` (
     `pin_id` bigint(20) NOT NULL COMMENT "",
     `pin` varchar(20) NOT NULL COMMENT "",
     `user_log_acct` hll HLL_UNION NOT NULL COMMENT ""
   ) ENGINE=OLAP
   AGGREGATE KEY(`pin_id`, `pin`)
   DISTRIBUTED BY HASH(`pin_id`) BUCKETS 16
   PROPERTIES (
   "storage_type" = "COLUMN"
   )
   
   **2、**
   alter table test_uv_21 modify column pin VARCHAR(20) null;
   
   3、
   ERROR 1064 (HY000): Cannot shorten string length
   

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