[mannyv]

I got a parquet file once and I was like WTF is this format?

The problem with parquet is it's complicated and you basically have to remap from parquet to whatever you're importing into because the people on the other side have remapped from whatever to parquet.

There are likely relationships and constraints there that you'll have to hack around - which is harder to do because the parquet tools sort of suck/aren't as flexible.

With CSV you can hack around any problem in the ETL process.