git clone https://github.com/greenlion/columnstore_tests
sudo yum install php-cli php-mysql php-pear
git checkout only_or
php run_tests --record # record results against MyISAM table
php run_tests --debug | tee only_or.txt #compare to CS table
Examine only_or.txt and you will find that the | operator returns wrong results for CS compared to MyISAM in 712 of 2186 tests.