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join_def.py
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52 lines (39 loc) · 1.31 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 __future__ import annotations
import dataclasses
import enum
from typing import Literal, NamedTuple
class JoinSide(enum.Enum):
LEFT = 0
RIGHT = 1
def inverse(self) -> JoinSide:
if self == JoinSide.LEFT:
return JoinSide.RIGHT
return JoinSide.LEFT
JoinType = Literal["inner", "outer", "left", "right", "cross"]
class JoinCondition(NamedTuple):
left_id: str
right_id: str
@dataclasses.dataclass(frozen=True)
class JoinColumnMapping:
source_table: JoinSide
source_id: str
destination_id: str
@dataclasses.dataclass(frozen=True)
class CoalescedColumnMapping:
"""Special column mapping used only by implicit joiner only"""
left_source_id: str
right_source_id: str
destination_id: str