HappenLee opened a new issue #4665:
URL: https://github.com/apache/incubator-doris/issues/4665
**Describe the bug**
There is a table:
```
CREATE TABLE `baseall` (
`k1` tinyint(4) NULL COMMENT "",
`k2` smallint(6) NULL COMMENT "",
`k3` int(11) NULL COMMENT "",
`k4` bigint(20) NULL COMMENT "",
`k5` decimal(9, 3) NULL COMMENT "",
`k6` char(5) NULL COMMENT "",
`k10` date NULL COMMENT "",
`k11` datetime NULL COMMENT "",
`k7` varchar(20) NULL COMMENT "",
`k8` double MAX NULL COMMENT "",
`k9` float SUM NULL COMMENT ""
) ENGINE=OLAP
AGGREGATE KEY(`k1`, `k2`, `k3`, `k4`, `k5`, `k6`, `k10`, `k11`, `k7`)
COMMENT "OLAP"
DISTRIBUTED BY HASH(`k1`) BUCKETS 5
PROPERTIES (
"replication_num" = "1",
"in_memory" = "false",
"storage_format" = "V2"
);
```
query:
```
select k7, k10 , k5, lag(k5, 1, 0) over (partition by k7 order by k10) as
new_k5 from baseall;
```
will cause exception:
```
[Code: 1064, SQL State: 42000] Type = VARCHAR() can't not convert to
VARCHAR()
```
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