@abstractmethod
    def add_equijoin_condition(self, col0, col1):
Creates a base64 CRC32C and/or MD5 digest from file_name.
dataset/ETHPy150Open uwescience/raco/raco/algebra.py/CompositeBinaryOperator.add_equijoin_condition--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/gsutil/gslib/copy_helper.py/_CreateDigestsFromLocalFile