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Type:
Task
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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Query Execution
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Fully Compatible
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None
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This parameter was designed to let us do hash aggregations and then do specific "lookups" into the hash table. It was intended for $lookup use, but we now compile $lookups differently, so we can get rid of this primitive.