Don't enumerate partition keys when constructing run requests for a single-run backfill #26728
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Summary:
This ensures that if you take a giant partition set and use a single run backfill, we don't individually enumerate every single key before assembling them back into a partition key range.
(we would have to get even fancier to be able to handle the non-single backfil multi-run case without ever enumerating partition key - would require some kindo of chunking method at the partitions level that lets you break up partition ranges into chunks).
BK
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