If a $sort is precedes a $group on a shard-key, we can safely push it down to shards after the $sort, since it consumes the sort order & effectively discards it (i.e. the merging pipeline doesn't need to know about it).
- depends on
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SERVER-92457 Push-down $group on shard key to shards
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- Closed
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SERVER-92470 Refactor pipeline splitting code for easier state tracking
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- Closed
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