sduzh opened a new issue #4218:
URL: https://github.com/apache/incubator-doris/issues/4218
**Describe the bug**
Wrong result of query with cast
**To Reproduce**
```
CREATE TABLE `t3` (
`c0` varchar(1)
) ENGINE=OLAP
DUPLICATE KEY(`c0`)
COMMENT "OLAP"
DISTRIBUTED BY HASH(`c0`) BUCKETS 10
PROPERTIES (
"replication_num" = "1",
"in_memory" = "false",
"storage_format" = "DEFAULT"
);
insert into t3 values(''),(NULL),('N'),('w');
SELECT *FROM t3 WHERE (CAST(t3.c0 AS BOOLEAN)) is NULL;
```
**Expected behavior**
```
+------+
| c0 |
+------+
| NULL |
| NULL |
| NULL |
| NULL |
+------+
```
**Real behavior**
```
+------+
| c0 |
+------+
| NULL |
+------+
```
** Additional Context**
```
mysql(sduzh) > select * from t3;
+------+
| c0 |
+------+
| |
| N |
| w |
| NULL |
+------+
mysql(sduzh)> select CAST('' AS BOOLEAN);
+---------------------+
| CAST('' AS BOOLEAN) |
+---------------------+
| NULL |
+---------------------+
1 row in set (0.02 sec)
mysql(sduzh)> select CAST('w' AS BOOLEAN);
+----------------------+
| CAST('w' AS BOOLEAN) |
+----------------------+
| NULL |
+----------------------+
1 row in set (0.01 sec)
mysql(sduzh)> select CAST('n' AS BOOLEAN);
+----------------------+
| CAST('n' AS BOOLEAN) |
+----------------------+
| NULL |
+----------------------+
1 row in set (0.02 sec)
```
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