<< operator returns wrong results in 915/1228 tests

git clone https://github.com/greenlion/columnstore_tests
sudo yum install php-cli php-mysql php-pear
cd columnstore_tests
git checkout left_shift
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 915 or 1228 tests.