sduzh opened a new issue #3875:
URL: https://github.com/apache/incubator-doris/issues/3875
**To Reproduce**
```SQL
CREATE TABLE t0(c0 DECIMAL(2,0) )DUPLICATE KEY(c0) DISTRIBUTED BY HASH(c0)
BUCKETS 1 PROPERTIES("replication_num"="1");
INSERT INTO t0 VALUES (1);
SELECT t0.c0 FROM t0 WHERE ((CAST(t0.c0 AS DATETIME)) IS NULL);
```
**Expected behavior**
```
+------+
| c0 |
+------+
| 1 |
+------+
1 row in set, 1 warning (0.00 sec)
```
**Real behavior**
```
Empty set (0.01 sec)
```
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