Fatih | Data Engineer on Instagram: "Using CSV for 1 Petabyte of data is guaranteed to make your cloud bill explode. Here’s why and the fix. ⬇️ 1️⃣ The Wrong Choice: The team picked CSV because it was quick to generate. But CSV is a row-based format. 2️⃣ Why That Hurts: In a Data Lake you typically query just 2–3 columns (e.g., user_id, error_code) from tables with hundreds of columns. 3️⃣ The Cost Trap: Row-based formats force engines like Athena to scan entire rows, loading every column into m