Major perf regression on julia 1.0

[davidanthoff]

@quinnj found this, and all the details are described over at queryverse/CSVFiles.jl#30.

@shashi is there a chance that you could take a look at that?

[davidanthoff]

@shashi any chance you might be able to look at this soon? Or some estimate when you might be able to take a look?

[davidanthoff]

I'm looking into this now and spending some time on that. If someone else has started, please let me know so that we don't duplicate efforts.

[shashi]

Sorry I haven't had time to look at this. I think this is not higher up on my list than WebIO bugs and porting JuliaDB (and as it turns out, course work) at the moment. Your help is much appreciated!