git clone https://github.com/greenlion/columnstore_tests.git
sudo yum install php-cli php-mysql php-pear
git checkout only_div
php run_tests --record # record results against MyISAM table
php run_tests --debug | tee out.txt #compare to CS table
Examine out.txt and you will find that the DIV operator returns wrong results for CS compared to MyISAM in 252 of 1179 tests.