westonpace commented on issue #34282:
URL: https://github.com/apache/arrow/issues/34282#issuecomment-1439176799
I think this could be potentially expensive on large CSV files:
```
#full data with new columns in header
dat = l1+b'\n'+l2+b'\n'+dat
```
Instead, how about:
* Open file, read first two lines, calculate headers (as you do today)
* Close file
* Call `read_csv` but set `skip_rows` to 2 and provide `column_names` so
that it doesn't look for a header row.
This will cause the first two lines of the file to be read twice but that
should be pretty cheap.
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