[SERVER-64830] Simplify exclusivity tracking in IndexSeekPoint Created: 23/Mar/22  Updated: 29/Oct/23  Resolved: 01/Apr/22

Status: Closed
Project: Core Server
Component/s: None
Affects Version/s: None
Fix Version/s: 6.0.0-rc0

Type: Task Priority: Major - P3
Reporter: Dan Larkin-York Assignee: Dan Larkin-York
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Backwards Compatibility: Fully Compatible
Sprint: QO 2022-04-04
Participants:

 Description   

Currently we maintain a bool _prefixExclusive and a vector of bools _suffixInclusive. What we actually need to know is whether there is an exclusive field, and if so, what is the index of the first exclusive field. This can be tracked with a single int. It's a very small change, but it allows us to simplify our checks in IndexEntryComparison::makeKeyStringFromSeekPointForSeek and leads to a modest but non-trivial speed-up in seek-heavy workloads when the index fits in memory.



 Comments   
Comment by Githook User [ 01/Apr/22 ]

Author:

{'name': 'Dan Larkin-York', 'email': 'dan.larkin-york@mongodb.com', 'username': 'dhly-etc'}

Message: SERVER-64830 Simplify exclusivity tracking in IndexSeekPoint
Branch: master
https://github.com/mongodb/mongo/commit/211be39f5e722bc7ccb9660fa622e33d44d0b30a

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