(self, compress_at=2048)
:param compress_at: columns with this number of values or fewer will
            be saved compressed on disk, and loaded into RAM for reading. Set
            this to 0 to disable compression.
:param compress_at: columns with this number of values or fewer will
            be saved compressed on disk, and loaded into RAM for reading. Set
            this to 0 to disable compression.
: param compress_at : columns with this number of values or fewer will be saved compressed on disk and loaded into RAM for reading . Set this to 0 to disable compression .
def __init__(self, compress_at=2048):
        """
        :param compress_at: columns with this number of values or fewer will
            be saved compressed on disk, and loaded into RAM for reading. Set
            this to 0 to disable compression.
        """

        self._compressat = compress_at
def __init__ ( self , compress_at = 2048 ) : self . _compressat = compress_at