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