zhangstar333 opened a new pull request, #28194:
URL: https://github.com/apache/doris/pull/28194
## Proposed changes
```
CREATE TABLE IF NOT EXISTS str_tb (k1 VARCHAR(10) NULL, v1 STRING NULL)
UNIQUE KEY(k1) DISTRIBUTED BY HASH(k1) BUCKETS 5
properties("replication_num" = "1")
mysql [test_query_qa]>set enable_fold_constant_by_be = true;
Query OK, 0 rows affected (0.00 sec)
mysql [test_query_qa]>INSERT INTO str_tb VALUES (2, repeat("test1111",
10000));
Query OK, 1 row affected (0.26 sec)
{'label':'label_687238ef637b4929_9675dd5b4f31d5bf', 'status':'VISIBLE',
'txnId':'16017'}
mysql [test_query_qa]>select length(v1) from str_tb;
+------------+
| length(v1) |
+------------+
| 65533 | // the repeat("test1111", 10000) length should be 80000, but
varchar have max length 65533
+------------+
1 row in set (0.07 sec)
```
Issue Number: close #xxx
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