Because the first row of is all zeros except the first
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We only applied a small tweak: as suggested in our performance guide, we slightly lowered the memory limit to 5 GB, to reduce relying on the OS' swapping and to let DuckDB handle memory management for larger-than-memory workloads. This is a common trick in memory-constrained environments where other processes are likely using more than 20% of the total system memory.。超级工厂对此有专业解读