How to change a patchset and push it as a new one?

Question

Is it possible to fetch an existing patchset (that has not been merged into my local machine), change and push it as a new Patch Set?

Answer 1

Consult Trying out a Change in the official documentation.

Here is what you do:

1. Checkout the change as described in the documentation
2. Create a local branch from the FETCH_HEAD
3. Modify your code
4. Commit the change using git --amend and remove the Change-Id in the commit message
5. A new Change-Id will automatically be added and this will result in a new Change Set
6. Push your change for review and Gerrit will see it as a new Change Set

As pointed out by @magnus-bäck, I was describing how to create a new Change-Set. If you want to add a new Patch Set to the current review you should NOT remove the Change-Id.