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Guesstimate partition boundaries from extrema rather than using expensive offsets

Nicolas Dandrimont requested to merge generated-differential-D1267-source into generated-differential-D1267-target

Using order by and offset makes the partitioning a n^2 operation on the number of entries in the table, rather than an instant operation when using min/max.

This assumes the indexable column is more or less uniform, which is not exactly true but not the worst approximation either.

Test Plan

tox

Migrated from D1267 (view on Phabricator)

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