* Enable the `JoinDocuments` node to work with documents with `score=None`
This fixes#2983
As of now, the `JoinDocuments` node will error out if any of the documents has `score=None` - which is possible, as some retriever are not able to provide a score, like the `TfidfRetriever` on Elasticsearch or the `BM25Retriever` on Weaviate.
THe reason for the error is that the `JoinDocuments` always sorts the documents by score and cannot sort when `score=None`.
There was a very similar issue for `JoinAnswers` too, which was addressed by this PR: https://github.com/deepset-ai/haystack/pull/2436
This solution applies the same solution to `JoinDocuments` - so both the `JoinAnswers` and `JoinDocuments` now will have the same additional argument to disable sorting when that is requried.
The solution is to add an argument to `JoinDocuments` called `sort_by_score: bool`, which allows the user to turn off the sorting of documents by score, but keeps the current functionality of sorting being performed as the default.
* Fixing test bug
* Addressing PR review comments
- Extending unit tests
- Simplifying logic
* Making the sorting work even with no scores
By making the no score being sorted as -Inf
* Forgot to commit the change in `join_docs.py`
* [EMPTY] Re-trigger CI
* Added am INFO log if the `JoinDocuments` is sorting while some of the docs have `score=None`
* Adjusting the arguments of `any()`
* [EMPTY] Re-trigger CI
* fix validation for dynamic outgoing edges
* Update Documentation & Code Style
* use class outgoing_edges as fallback if no instance is provided
* implement classmethod approach
* readd comment
* fix mypy
* fix tests
* set outgoing_edges for all components
* set outgoing_edges for mocks too
* set document store outgoing_edges to 1
* set last missing outgoing_edges
* enforce BaseComponent subclasses to define outgoing_edges
* override _calculate_outgoing_edges for FileTypeClassifier
* remove superfluous test
* set rest_api's custom component's outgoing_edges
* Update docstring
Co-authored-by: Sara Zan <sara.zanzottera@deepset.ai>
* remove unnecessary else
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Sara Zan <sara.zanzottera@deepset.ai>
