b7e09b55-9333-4c49-b273-87a69e5c463f

# coding=utf-8
# Copyright 2018-2023 EvaDB
#
# 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 typing import Iterator

from evadb.database import EvaDBDatabase
from evadb.executor.abstract_executor import AbstractExecutor
from evadb.models.storage.batch import Batch
from evadb.plan_nodes.limit_plan import LimitPlan


class LimitExecutor(AbstractExecutor):
    """
    Limits the number of rows returned

    Arguments:
        node (AbstractPlan): The Limit Plan

    """

    def __init__(self, db: EvaDBDatabase, node: LimitPlan):
        super().__init__(db, node)
        self._limit_count = node.limit_value

    def exec(self, *args, **kwargs) -> Iterator[Batch]:
        child_executor = self.children[0]
        remaining_tuples = self._limit_count
        # aggregates the batches into one large batch
        for batch in child_executor.exec(**kwargs):
            if len(batch) > remaining_tuples:
                yield batch[:remaining_tuples]
                return

            remaining_tuples -= len(batch)
            yield batch

            if remaining_tuples <= 0:
                assert remaining_tuples == 0
                return

1	# coding=utf-8
2	# Copyright 2018-2023 EvaDB
3	#
4	# Licensed under the Apache License, Version 2.0 (the "License");
5	# you may not use this file except in compliance with the License.
6	# You may obtain a copy of the License at
7	#
8	# http://www.apache.org/licenses/LICENSE-2.0
9	#
10	# Unless required by applicable law or agreed to in writing, software
11	# distributed under the License is distributed on an "AS IS" BASIS,
12	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	# See the License for the specific language governing permissions and
14	# limitations under the License.
15	from typing import Iterator	1✔
16
17	from evadb.database import EvaDBDatabase	1✔
18	from evadb.executor.abstract_executor import AbstractExecutor	1✔
19	from evadb.models.storage.batch import Batch	1✔
20	from evadb.plan_nodes.limit_plan import LimitPlan	1✔
21
22
23	class LimitExecutor(AbstractExecutor):	1✔
24	"""
25	Limits the number of rows returned
26
27	Arguments:
28	node (AbstractPlan): The Limit Plan
29
30	"""
31
32	def __init__(self, db: EvaDBDatabase, node: LimitPlan):	1✔
33	super().__init__(db, node)	1✔
34	self._limit_count = node.limit_value	1✔
35
36	def exec(self, args, *kwargs) -> Iterator[Batch]:	1✔
37	child_executor = self.children[0]	1✔
38	remaining_tuples = self._limit_count	1✔
39	# aggregates the batches into one large batch
40	for batch in child_executor.exec(**kwargs):	1✔
41	if len(batch) > remaining_tuples:	1✔
42	yield batch[:remaining_tuples]	1✔
43	return	1✔
44
45	remaining_tuples -= len(batch)	1✔
46	yield batch	1✔
47
48	if remaining_tuples <= 0:	1✔
49	assert remaining_tuples == 0	×
50	return	×

georgia-tech-db / eva / b7e09b55-9333-4c49-b273-87a69e5c463f

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