& operator returns wrong results in 4301 out of 21806 tests

git clone https://github.com/greenlion/columnstore_tests
sudo yum install php-cli php-mysql php-pear
cd columnstore_tests
git checkout only_and
php run_tests --debug | tee only_and.txt

Examine only_and.txt and you will find that the & operator returns wrong results for CS compared to MyISAM in 4301 tests of 21806.

It looks like the operator returns 0 instead of some other correct value in most of these tests.