At first glance, it looks deceptively simple, “fill down Excel cells.”But that innocent-sounding task hides one of the most persistent, high-friction data problems in business: the hierarchical Excel sheet. Every…
TL;DR — Key Takeaways 1,000,000-row stress test, real Excel limitsFlattened a full-size workbook (1,000,000 rows × 5 cols) on a laptop without a single memory spike. Performance Excel → Excel:…
xlfilldown streams an Excel sheet into SQLite or a new Excel sheet, forward-filling selected columns by header name (or letters), optionally keeping original Excel row numbers and computing a stable…
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