issues: 777153550

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
777153550 MDExOlB1bGxSZXF1ZXN0NTQ3NTIwNjI0 4746 Faster unstacking 5635139 closed 0     22 2020-12-31T22:55:26Z 2021-01-24T23:48:09Z 2021-01-24T23:48:05Z MEMBER   0 pydata/xarray/pulls/4746

asv profile unstacking.Unstacking.time_unstack_slow runs in 10ms now, down from 1076ms.

Todos: - [x] Resolve how to handle sparse arrays — they currently go through the existing functions, and we have one test failure - [x] Decide what to do with the existing functions — in particular Variable.unstack wouldn't work with the new code, since it requires the index which is being unstacked, and variables don't have indexes. The existing function will fail on any missing indexes, but may still be useful. - [x] Clean up the code a bit — remove _fast from names where possible / remove some dead comments - [x] Passes isort . && black . && mypy . && flake8 - [x] User visible changes (including notable bug fixes) are documented in whats-new.rst

 
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