kangkaisen opened a new issue #2946: coalesce date result is wrong
URL: https://github.com/apache/incubator-doris/issues/2946
 
 
   **Describe the bug**
   ```
   CREATE TABLE `baseall_date` (
     `k1` date not NULL COMMENT "",
     `k3` int(11) not NULL COMMENT "",
     `k9` float not NULL COMMENT ""
   ) ENGINE=OLAP
   DUPLICATE KEY(`k1`, `k3`)
   PARTITION BY RANGE (k1)
   (
     PARTITION p1 VALUES LESS THAN ("2020-02-15"),
     PARTITION p2 VALUES LESS THAN ("2020-02-16"),
     PARTITION p3 VALUES LESS THAN ("2020-02-17")
   )
   DISTRIBUTED BY HASH(`k3`) BUCKETS 10
   PROPERTIES (
    "replication_num" = "1"
   );
   
   insert into baseall_date (k1,k3,k9) values ('2020-02-16', 2147483647, 12.17);
   ```
   
   ```
   select coalesce(k1, k1) from baseall_date;
   ```
   
   The result is `20200216`, should be `2020-02-16`

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