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feat: Sort grouping key columns to maximize the prefix sort optimizat…
…ion (facebookincubator#11720) Summary: Reorder the grouping keys of hash aggregation to maximize the prefix sort acceleration with limited max normalized key size. It sorts the grouping keys based on the prefix sort encoded key size and putting the grouping key with minimal encoded size first. This enables sort more columns using prefix sort for use case like hash aggregation which doesn't require a total order. This PR also cleanup the prefix sort a bit. Differential Revision: D66638085
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