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[PERF] Set min_partitions for post aggregation shuffles (#1861)
Added a config variable to set the minimum partitions produced after first stage aggregations. Here's a comparison between shuffling with same number of input partitions vs a much smaller number <img width="824" alt="Screenshot 2024-02-09 at 4 40 08 PM" src="https://github.com/Eventual-Inc/Daft/assets/77712970/09566028-6776-441e-909f-db0af6ebf3f2"> <img width="816" alt="Screenshot 2024-02-09 at 4 41 14 PM" src="https://github.com/Eventual-Inc/Daft/assets/77712970/d45b4801-4044-4879-92ec-f9196f06c0cc">
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