remove dirty Index Page

[eatbreads]

Here are some reminders before you submit the pull request

• Add tests for the change
• Document changes
• Reference the link of issue using fixes eloqdb/eloqstore#issue_id
• Reference the link of RFC if exists
• Pass ctest --test-dir build/tests/

Summary by CodeRabbit

• Refactor
  • Internal improvements to batch write task processing. Refactored core state management and metadata tracking mechanisms to enhance code efficiency, maintainability, and overall system architecture. Changes streamline internal operations, optimize data flow patterns, and improve code quality while fully preserving all existing user-facing functionality and behavior.

[coderabbitai]

Walkthrough

The pull request removes the DirtyIndexPage helper struct from BatchWriteTask and refactors the FinishIndexPage method signature to accept three separate out-parameters (MemIndexPage*&, std::string&, PageId&) instead of a struct reference, with corresponding updates throughout the implementation.

Changes

Cohort / File(s)	Summary
Header Declaration Updates include/tasks/batch_write_task.h	Removed DirtyIndexPage struct and updated FinishIndexPage method signature to replace struct parameter with three explicit out-parameters for previous page pointer, key, and page ID.
Implementation Refactoring src/tasks/batch_write_task.cpp	Updated all call sites and internal logic to use explicit prev_page, prev_key, and prev_page_id variables instead of DirtyIndexPage struct fields; modified Pop(), FinishIndexPage(), FlushIndexPage(), and redistribution logic to manage previous page metadata as individual parameters.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• #328 — Directly related refactoring of DirtyIndexPage handling; this PR removes the struct entirely while the other modifies its destructor to address double-free issues.

Suggested reviewers

• thweetkomputer

Poem

🐰 The wrapper struct bid farewell today,
As pointers and refs found a clearer way,
No more nested fields in a bundle tight,
Just metadata flowing, explicit and right!
Three parameters dance where one struct stood—
A refactor that's clean and solidly good! ✨

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request description contains only a bare checklist template with no actual description of the code changes, why they're needed, or what was modified.	Add a detailed description explaining the motivation for removing DirtyIndexPage, the specific changes made (method signature updates, struct removal), and any migration notes for call sites.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'remove dirty Index Page' directly describes the main change: removing the DirtyIndexPage helper struct and refactoring related code to use explicit parameters.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch remove_dirty

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