group-by with tree grouping feature
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genmeblog commented
Disccusion: https://clojurians.zulipchat.com/#narrow/stream/264992-ml-study/topic/session.2013.2E1/near/228975717
Sketch of the solution:
- introduce new option :tree?
- It should work only in case when grouping-selector is as seq of column names:
[col-1 col-2 ... col-n] - prepare different groupings for each level, ie:
[col-1],[col-1 col-2],[col-1 col-2 col-3]...[col-1 col-2 ... col-n] - concat result (differently for each return type).
To concat dataset, tablecloth.api.dataset/concat should be used.