How many of n expected column names a row must contain to count as the header: half of them, and at least two (one, if only one is expected). Two exact column names in a preamble or data row are not a coincidence these files produce.
n
How many of
nexpected column names a row must contain to count as the header: half of them, and at least two (one, if only one is expected). Two exact column names in a preamble or data row are not a coincidence these files produce.