The current... attempt at an approach was broken and becoming horribly
unmaintainable. Two issues found without even looking:
1. Field inference didn't understand prefixes, leading to duplicate
by/field fields when attempting to infer by fields with --prefix.
2. Sort wasn't working for some reason, probably because they behavior
of sort, defines, etc are really weird since they apply to both by
fields and field fields.
I considered just dropping support for --prefix completely, this really
isn't worth the time, but instead found a simple solution of moving
prefix handling to one of the first steps in collect_csv.
This has the downside of creating conflicts when a prefixed/non-prefixed
field has the same name, but I don't care. --prefix is a niche flag that
shouldn't mess with the rest of the code like this, and none of the
other scripts really handle field conflicts correctly anyways.
Christopher Haster
98279a0b36