refactor "group by" to use embedded documents #168
Merged
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
A new approach to compute group by using get project. This implementation simplifies group by, now it does not need GROUP_SEPARATOR and fold and unfold method.
Currently the foreign field are compute like:
'_id': {'T3___age': '$T3.age', 'age': '$age', 'name': '$name'}
With this changes:
'_id': {'T3': {'age': '$T3.age'}, 'age': '$age', 'name': '$name'}