# Description of Changes
Add a guard against `stack overflow` in case of nested expression and
`joins`.
# API and ABI breaking changes
None
# Expected complexity level and risk
1
# Testing
- [x] Find how `deep` can be recursed the affected functions and put a
limit on it
- [x] Add a extra test to prove we can (in theory) do lots of `joins` in
the planning steps, even if executing them will be slow
Mario Montoya
b54a4e49b9