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from agate.aggregations.base import Aggregation
from agate.data_types import Number
from agate.exceptions import DataTypeError
from agate.utils import max_precision
class MaxPrecision(Aggregation):
"""
Find the most decimal places present for any value in this column.
:param column_name:
The name of the column to be searched.
"""
def __init__(self, column_name):
self._column_name = column_name
def get_aggregate_data_type(self, table):
return Number()
def validate(self, table):
column = table.columns[self._column_name]
if not isinstance(column.data_type, Number):
raise DataTypeError('MaxPrecision can only be applied to columns containing Number data.')
def run(self, table):
column = table.columns[self._column_name]
return max_precision(column.values_without_nulls())
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