georgia-tech-db / eva / #850

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#850

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circleci

americast 
fix metrics logic

0 of 1 new or added line in 1 file covered. (0.0%)

9789 existing lines in 252 files now uncovered.

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0.0
/evadb/executor/project_executor.py
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# coding=utf-8
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# Copyright 2018-2023 EvaDB
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#     http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import Iterator
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import pandas as pd




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from evadb.database import EvaDBDatabase




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from evadb.executor.abstract_executor import AbstractExecutor




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from evadb.executor.executor_utils import (




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    ExecutorError,










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    apply_project,










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    instrument_function_expression_cost,










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)











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from evadb.models.storage.batch import Batch




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from evadb.plan_nodes.project_plan import ProjectPlan




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class ProjectExecutor(AbstractExecutor):




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    """ """










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    def __init__(self, db: EvaDBDatabase, node: ProjectPlan):




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        super().__init__(db, node)




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        self.target_list = node.target_list




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    def exec(self, *args, **kwargs) -> Iterator[Batch]:




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        # SELECT expr;











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        if len(self.children) == 0:




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            # Create a dummy batch with size 1











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            dummy_batch = Batch(pd.DataFrame([0]))




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            batch = apply_project(dummy_batch, self.target_list)




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            if not batch.empty():




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                yield batch




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        # SELECT expr FROM table;











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        elif len(self.children) == 1:




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            child_executor = self.children[0]




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            for batch in child_executor.exec(**kwargs):




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                batch = apply_project(batch, self.target_list)




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                if not batch.empty():




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                    yield batch




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        else:










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            raise ExecutorError("ProjectExecutor has more than 1 children.")










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        # instrument required stats











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        instrument_function_expression_cost(self.target_list, self.catalog())




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