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Published
20 hours ago •
observablehq
observablehq
lazily materialize the groups
Makes lazy calls to take (which is expensive on arrow tables). The total # of calls to take in the tests goes from 34068 to 11778 (differenceY and differenceYVariable are the main consumers of this function). This should give better performance to the group transform on large datasets.
Related: #2030
More experimentation: I've pushed another strategy, even though I'm not convinced it's better. Maybe it will give us new ideas.