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35 lines (30 loc) · 1.26 KB
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# Copyright 2023 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from dataclasses import dataclass
import typing
import bigframes.core.ordering as orderings
@dataclass(frozen=True)
class WindowSpec:
"""
Specifies a window over which aggregate and analytic function may be applied.
grouping_keys: set of column ids to group on
preceding: Number of preceding rows in the window
following: Number of preceding rows in the window
ordering: List of columns ids and ordering direction to override base ordering
"""
grouping_keys: typing.Tuple[str, ...] = tuple()
ordering: typing.Tuple[orderings.OrderingColumnReference, ...] = tuple()
preceding: typing.Optional[int] = None
following: typing.Optional[int] = None
min_periods: int = 0