@classmethod
    def add_hook(cls, hook_type, hook_func):
        if hook_type not in cls._hooks_map:
            cls._hooks_map[hook_type] = []

        cls._hooks_map[hook_type].append(hook_func)
Concatenate values of a given column as a string.
dataset/ETHPy150Open openstack/python-solumclient/solumclient/openstack/common/apiclient/base.py/HookableMixin.add_hook--crossover with--dataset/ETHPy150Open sdispater/orator/orator/query/builder.py/QueryBuilder.implode