[Bug]: Implement full outer join.

[Ariznawlll]

Is there an existing issue for the same bug?

• I have checked the existing issues.

Branch Name

main

Commit ID

e4637ad

Other Environment Information

- Hardware parameters:
- OS type:
- Others:

Actual Behavior

Currently, full outer join is not supported. It would be great if this feature could be added.

Expected Behavior

No response

Steps to Reproduce

as above

Additional information

No response

[aunjgr]

implemented