morrySnow opened a new pull request, #17639:
URL: https://github.com/apache/doris/pull/17639
# Proposed changes
support update from syntax:
```
UPDATE <target_table>
SET <col_name> = <value> [ , <col_name> = <value> , ... ]
[ FROM <additional_tables> ]
[ WHERE <condition> ]
```
for example:
t1
```
+----+----+----+-----+------------+
| id | c1 | c2 | c3 | c4 |
+----+----+----+-----+------------+
| 3 | 3 | 3 | 3.0 | 2000-01-03 |
| 2 | 2 | 2 | 2.0 | 2000-01-02 |
| 1 | 1 | 1 | 1.0 | 2000-01-01 |
+----+----+----+-----+------------+
```
t2
```
+----+----+----+------+------------+
| id | c1 | c2 | c3 | c4 |
+----+----+----+------+------------+
| 4 | 4 | 4 | 4.0 | 2000-01-04 |
| 2 | 20 | 20 | 20.0 | 2000-01-20 |
| 5 | 5 | 5 | 5.0 | 2000-01-05 |
| 1 | 10 | 10 | 10.0 | 2000-01-10 |
| 3 | 30 | 30 | 30.0 | 2000-01-30 |
+----+----+----+------+------------+
```
t3
```
+----+
| id |
+----+
| 1 |
| 5 |
| 4 |
+----+
```
do update
```sql
update t1 set t1.c1 = t2.c1, t1.c3 = t2.c3 * 100 from t2 inner join t3 on
t2.id = t3.id where t1.id = t2.id;
```
the result
```
+----+----+----+--------+------------+
| id | c1 | c2 | c3 | c4 |
+----+----+----+--------+------------+
| 3 | 3 | 3 | 3.0 | 2000-01-03 |
| 2 | 2 | 2 | 2.0 | 2000-01-02 |
| 1 | 10 | 1 | 1000.0 | 2000-01-01 |
+----+----+----+--------+------------+
```
## Problem summary
Describe your changes.
## Checklist(Required)
* [ ] Does it affect the original behavior
* [ ] Has unit tests been added
* [ ] Has document been added or modified
* [ ] Does it need to update dependencies
* [ ] Is this PR support rollback (If NO, please explain WHY)
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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