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Type:
Improvement
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Resolution: Unresolved
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Priority:
Major - P3
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Affects Version/s: None
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Query Execution
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Currently, $group performance in SBE is more sensitive to the number of accumulators than in Classic, with 16 accumulators being a rough cutoff for when it no longer makes sense to use SBE.
We don't want to apply this limit to $group stages that would run using block processing, however, because block processing requires SBE and provides a significant performance improvement.