32 lines
907 B
Python
32 lines
907 B
Python
|
#!/usr/bin/env python
|
||
|
|
|
||
|
|
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())
|