# Copyright 2025 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.
import abc
from typing import Optional

from bigframes.core import bigframe_node
from bigframes.session import executor


# Unstable interface, in development
class SemiExecutor(abc.ABC):
    """
    A semi executor executes a subset of possible plans, returns None for unsupported plans.
    """

    def execute(
        self,
        plan: bigframe_node.BigFrameNode,
        ordered: bool,
        peek: Optional[int] = None,
    ) -> Optional[executor.ExecuteResult]:
        raise NotImplementedError("execute not implemented for this executor")
