'Construct an INTERVAL.
Note that only DAY TO SECOND intervals are currently supported.
This is due to a lack of support for YEAR TO MONTH intervals
within available DBAPIs (cx_oracle and zxjdbc).
:param day_precision: the day precision value.  this is the number of digits
to store for the day field.  Defaults to "2"
:param second_precision: the second precision value.  this is the number of digits
to store for the fractional seconds field.  Defaults to "6".'

def __init__(self, day_precision=None, second_precision=None):

    self.day_precision = day_precision
    self.second_precision = second_precision
