Problem: memiavl inefficient code in rare path

[yihuang]

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PR Checklist:

• [ ] Have you read the CONTRIBUTING.md?
• [ ] Does your PR follow the C4 patch requirements?
• [ ] Have you rebased your work on top of the latest master?
• [ ] Have you checked your code compiles? (make)
• [ ] Have you included tests for any non-trivial functionality?
• [ ] Have you checked your code passes the unit tests? (make test)
• [ ] Have you checked your code formatting is correct? (go fmt)
• [ ] Have you checked your basic code style is fine? (golangci-lint run)
• [ ] If you added any dependencies, have you checked they do not contain any known vulnerabilities? (go list -json -m all | nancy sleuth)
• [ ] If your changes affect the client infrastructure, have you run the integration test?
• [ ] If your changes affect public APIs, does your PR follow the C4 evolution of public contracts?
• [ ] If your code changes public APIs, have you incremented the crate version numbers and documented your changes in the CHANGELOG.md?
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Thank you for your code, it's appreciated! :)

Summary by CodeRabbit

• New Features

  • Improved performance of the database change set application process, resulting in faster operations.

• Bug Fixes

  • Streamlined logic for handling change sets, reducing potential inefficiencies.

• Documentation

  • Updated comments for clarity on method behavior and logic flow.

[coderabbitai[bot]]

Walkthrough

The changes in this pull request focus on the ApplyChangeSets method within the DB struct in the memiavl/db.go file. The logic for applying change sets to the database has been optimized. The previous conditional structure for handling empty change sets has been simplified, allowing for a more efficient direct call to db.MultiTree.ApplyChangeSets(changeSets) when applicable. The slow path for merging change sets is retained but streamlined. Additionally, comments have been updated for clarity and adherence to best practices.

Changes

File	Change Summary
memiavl/db.go	Modified ApplyChangeSets method logic for efficiency; streamlined handling of change sets; updated comments for clarity.

Suggested reviewers

• calvinaco
• mmsqe
• leejw51crypto

Poem

In the burrow where changes grow,
A method's path now flows with glow.
With each new set, it hops with glee,
Merging swiftly, oh so free!
Comments bright, the code's delight,
A rabbit's cheer for changes right! 🐇✨

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 36.88%. Comparing base (a87e03b) to head (c6afc0a). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
memiavl/db.go	60.00%	1 Missing and 1 partial :warning:

Additional details and impacted files

[](https://app.codecov.io/gh/crypto-org-chain/cronos/pull/1620?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=crypto-org-chain) ```diff @@ Coverage Diff @@ ## main #1620 +/- ## =========================================== + Coverage 17.73% 36.88% +19.14% =========================================== Files 72 102 +30 Lines 5204 8055 +2851 =========================================== + Hits 923 2971 +2048 - Misses 4158 4706 +548 - Partials 123 378 +255 ``` | [Files with missing lines](https://app.codecov.io/gh/crypto-org-chain/cronos/pull/1620?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=crypto-org-chain) | Coverage Δ | | |---|---|---| | [memiavl/db.go](https://app.codecov.io/gh/crypto-org-chain/cronos/pull/1620?src=pr&el=tree&filepath=memiavl%2Fdb.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=crypto-org-chain#diff-bWVtaWF2bC9kYi5nbw==) | `64.11% <60.00%> (ø)` | | ... and [46 files with indirect coverage changes](https://app.codecov.io/gh/crypto-org-chain/cronos/pull/1620/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=crypto-org-chain)