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Dylan M. Taylor
f02e3afbdf
Every record is padded to every field and the list is kept twice (as read, and filtered and sorted), so a short CSV with a 1,000-field header and 100,000 one-field rows held 2 x 100 million empty cells, several gigabytes. A list now keeps at most 4 million cells: wide lists keep fewer records (with a warning), narrow ones keep the usual 100,000.