cd build
cmake ..
make

Install msys2. In msys2 shell, install dependencies:

pacman -Syu git mingw-w64-x86_64-{cmake,toolchain,python-pip}

Then build it:

cd build
cmake .. -G 'MinGW Makefiles'
mingw32-make.exe

First install pyyaml python library if you don't already have it

python3 -m pip install pyyaml
cd build
./runTests.py

Show usage info:

./cql help

Run queries from command line:

./cql "select * from stuff.csv"

Start http server to run queries from web browser interface or to view query language documentation:

./cql

Here are two 11GB files being joined on a computer with 8GB of ram, though it would have worked fine with 2GB: