⚡ Bolt: 최솟값 탐색 성능 개선을 위한 O(N) 알고리즘 적용 (O(N log N) 회피)

[seonghobae]

💡 What:

• R/surveyFA.R 파일 내에서 최솟값을 가지는 문항(candidate)을 찾을 때 사용하던 names(sort(p_values, decreasing = FALSE))[1L] 코드를 names(which.min(p_values))로 변경하였습니다.
• 성능 최적화 관련 학습 내용을 .jules/bolt.md 저널에 기록하였습니다.

🎯 Why:

• 기존 sort() 기반 탐색은 전체 데이터를 정렬한 뒤 첫 번째 요소를 추출하므로 시간 복잡도가 O(N log N)입니다. 단지 최솟값을 찾기 위해 전체를 정렬하는 것은 비효율적입니다.
• 이를 선형 탐색(linear scan)을 수행하는 which.min()으로 변경함으로써 시간 복잡도를 O(N)으로 대폭 낮추어 실행 속도와 메모리 효율성을 개선했습니다.

📊 Impact:

• 문항 수가 많아질수록 탐색 속도가 개선되며, 불필요한 메모리 할당(정렬된 배열 생성)을 방지할 수 있습니다. 반복적인 문항 제거 루틴에서 누적 오버헤드를 줄입니다.

🔬 Measurement:

• 전체 테스트 스위트 실행 (testthat::test_dir('tests/testthat'))을 통해 최솟값 탐색 로직 변경 전후의 동작이 동일함을 검증하였고, 모든 테스트가 정상 통과하는 것을 확인하였습니다.

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PR created automatically by Jules for task 15670156229399977717 started by @seonghobae

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[opencode-agent]

Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

• Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

• Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

• Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

• Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

• Result: REQUEST_CHANGES

• Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head 8645fdf78d0e6cfc161b15081551b12d91bf86e5.

• Head SHA: 8645fdf78d0e6cfc161b15081551b12d91bf86e5

• Workflow run: 29613413152

• Workflow attempt: 1

Coverage evidence

Coverage Decision

• Result: FAIL
• Test evidence: not proven passing
• Docstring evidence: not proven passing when configured
• Failure count: 1

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Changed file (2 files)"]
  S1 --> I1["repository behavior"]
  I1 --> R1["Review risk: Changed file (2 files)"]
  R1 --> V1["required checks"]

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[opencode-agent]

OpenCode Review Overview

• Head SHA: 8645fdf78d0e6cfc161b15081551b12d91bf86e5
• Workflow run: 29613413152
• Workflow attempt: 1
• Gate result: REQUEST_CHANGES (approval step)

Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

• Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

• Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

• Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

• Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

• Result: REQUEST_CHANGES

• Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head 8645fdf78d0e6cfc161b15081551b12d91bf86e5.

• Head SHA: 8645fdf78d0e6cfc161b15081551b12d91bf86e5

• Workflow run: 29613413152

• Workflow attempt: 1

Coverage evidence

Coverage Decision

• Result: FAIL
• Test evidence: not proven passing
• Docstring evidence: not proven passing when configured
• Failure count: 1

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Changed file (2 files)"]
  S1 --> I1["repository behavior"]
  I1 --> R1["Review risk: Changed file (2 files)"]
  R1 --> V1["required checks"]

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