Hey.  Yep, xxhash64 (or even just hash) generate numerical values for you.  Combine with abs function to ensure the value is positive.  In our team we used abs(hash()) ourselves... for maybe a day.  Very quickly I observed a collision, and the data set was not at all large.  Of course what columns you include matter, but a large factor would have been enforcing a positive value.

We dropped the abs and went with xxhash64.  It is probably big enough, but use case matters.  Now we're considering the seemingly tried-and-true SHA2 256 instead.