xsv: add transpose command #146
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transpose command to transpose rows/columns of CSV data.
PR BurntSushi#137
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@BurntSushi could you take a look at this PR? |
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This adds a transpose subcommand to transpose rows/columns of CSV data.
Motivation: Fixes Issue #137.
Implementation: By default, loads the entire CSV into memory and write out the transpose. For large datasets that doesn't fit into memory, there is a --multipass argument to process the transpose by making multiple passes over the dataset. This consumes memory proportional to the number of rows.