def __init__(self, clock = time):
        self._timers = {}
        self._meters = {}
        self._counters = {}
        self._histograms = {}
        self._gauges = {}
        self._clock = clock
Alters the given column name so it will match the given field.
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/pyformance-0.3.2/pyformance/registry.py/MetricsRegistry.__init__--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/South-1.0.2/south/db/firebird.py/DatabaseOperations.alter_column