Frequency command causes allocated memory exhausted message on csv file with many fields

xsv is a great utility - thanks much for creating this very useful program!

Attached is a csv file with 333 fields. The frequency command works before indexing the file. However, after indexing, the frequency command immediately reports many "allocated memory exhausted" error messages.

FYI, the stats and count commands works fine after indexing. I have not tried many of the commands so I don't know if other commands also fail.

I am running xsv version 0.13.0 on Windows 10: [xsv-0.13.0-x86_64-pc-windows-gnu.zip]gnu.zip)

all_100k.csv