data-comparison/CHANGES_SUMMARY.md

Changes Summary - Data Comparison Logic Fix

Issues Fixed

1. Removed All-Sheet Functionality

• Problem: The tool was processing all sheets together, causing cross-sheet duplicate detection
• Solution: Completely removed all-sheet functionality, now only processes one sheet at a time
• Changes:
  • Replaced extract_kst_coordi_items() with extract_kst_coordi_items_for_sheet(sheet_name)
  • Updated all comparison methods to work sheet-specifically

2. Fixed Duplicate Detection Logic

• Problem: Items appearing once on each side were incorrectly marked as duplicates
• Solution: Fixed _find_duplicates_in_list() to only return items that actually appear multiple times
• Changes: Used Counter to count occurrences and only return items with count > 1

3. Implemented Mixed Duplicate Priority

• Problem: Items showing as both pure duplicates and mixed duplicates
• Solution: Mixed duplicates (items in both datasets with duplicates on one side) now take priority
• Changes: Generate mixed duplicates first, then exclude those keys from pure duplicate lists

4. Sheet-Specific Analysis Only

• Problem: Cross-sheet contamination in duplicate detection
• Solution: All analysis now happens within a single sheet context
• Changes:
  • get_comparison_summary() now requires sheet filter and defaults to first sheet
  • Removed old filtering methods, replaced with sheet-specific extraction

BA Confirmed Cases - All Working ✅

US URGENT Sheet

• ✅ 금수의 영역 - Episode 17 → Coordi duplicate
• ✅ 신결 - Episode 23 → Coordi duplicate
• ✅ 트윈 가이드 - Episode 31 → Mixed duplicate (exists in both, duplicates in Coordi)
• ✅ No longer shows 트윈 가이드 - Episode 31 as pure Coordi duplicate

TH URGENT Sheet

• ✅ 백라이트 - Episode 53-1x(휴재) → KST duplicate (doesn't appear in Coordi)

Code Changes Made

data_comparator.py

1. New Methods:

   • extract_kst_coordi_items_for_sheet(sheet_name) - Sheet-specific extraction
   • categorize_mismatches_for_sheet(sheet_data) - Sheet-specific categorization
   • generate_mismatch_details_for_sheet() - Sheet-specific mismatch details with priority logic
   • group_by_title_for_sheet() - Sheet-specific grouping

2. Updated Methods:

   • _find_duplicates_in_list() - Fixed to only return actual duplicates
   • get_comparison_summary() - Now sheet-specific only
   • print_comparison_summary() - Added sheet name to output

3. Removed Methods:

   • extract_kst_coordi_items() - Replaced with sheet-specific version
   • categorize_mismatches() - Replaced with sheet-specific version
   • generate_mismatch_details() - Replaced with sheet-specific version
   • group_by_title() - Replaced with sheet-specific version
   • filter_by_sheet() - No longer needed
   • filter_grouped_data_by_sheet() - No longer needed
   • calculate_filtered_counts() - No longer needed

web_gui.py

• Updated matched items extraction to use new grouped data structure
• Removed dependency on old categorize_mismatches() method

Test Files

• test_ba_confirmed_cases.py - New test to verify BA confirmed expectations
• test_sheet_filtering.py - Updated to work with new sheet-specific logic

Performance Improvements

• Faster analysis since no cross-sheet processing
• More accurate duplicate detection
• Cleaner separation of concerns between sheets

Verification

All tests pass:

• ✅ Sheet filtering works correctly
• ✅ Duplicate detection is accurate
• ✅ BA confirmed cases match expectations
• ✅ Web interface works properly
• ✅ Mixed duplicates take priority over pure duplicates