pingcap/tidb

Use a new struct to store the props generated by `preparePossibleProperties`

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#10,749 opened on Jun 10, 2019

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help wantedsig/plannertype/performance

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Description

after https://github.com/pingcap/tidb/pull/10548 There'll be multiple props which share the same suffix. We can implement a struct which can store the eqPrefixLen to cut off the possible props then reduce the search space.

Contributor guide

Research direction
Review the referenced PR #10548 to understand the current props generation logic, then design a struct that stores `eqPrefixLen` to reduce search space by cutting off possible props. Implement the struct and integrate it with the existing code.
Tech stack
go
Domain
backenddatabaseperformance
Issue type
Refactor
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GoGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40