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Just for fun...
awk 'NF>n{n=NF}{$n=$n}NR>FNR' FS=\| OFS=\| file file

Try:
awk -v n=3 '{$n=$n}1' FS=\| OFS=\| file





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Setting NF works with gawk and mawk, but not every awk recomputes the record the NF variable. Forcing a recompute with $1=$1 after...