Update one field in sphinx RT index

Question

Is it possible to update only one field out of two in sphinx sql or in PHP? for example the below is the index that I have

+-----------+---------+
| Field     | Type    |
+-----------+---------+
| id        | integer |
| article   | field   |
| notes     | field   |
| post_date | uint    |
| gid       | uint    |
+-----------+---------+

and then I'm inserting this

insert into artidx values (1, 'test article', 'note one', 1234,1);

Then this, which is updating "article" just fine but removing "notes",

replace into artidx (id, article) values (1, 'test article modified');

Answer 1

No. Not possible.

To update a field, need to delete the whole record and re-insert it.

The REPLACE INTO command, just does this in one step.