Thank you for linking this. It seems to be much more intuitive than awk, especially for his particular purpose. I wish I would have found this a few months ago when I was slicing and dicing lots of data for an extensive system migration project.
nice.
long time ago I had much success importing and filtering multiple gigabytes of CSV data into elasticsearch using CSVfix (if I'm not mistaken) + jq (converting it to json-lines in between, using jq as well)
xsv seems to cover some areas I've used jq.