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null_ops.py
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null_ops.py
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#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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 Union
from pandas.api.types import CategoricalDtype
from pyspark.pandas._typing import Dtype, IndexOpsLike
from pyspark.pandas.data_type_ops.base import (
DataTypeOps,
_as_bool_type,
_as_categorical_type,
_as_other_type,
_as_string_type,
)
from pyspark.pandas.typedef import pandas_on_spark_type
from pyspark.sql.types import BooleanType, StringType
class NullOps(DataTypeOps):
"""
The class for binary operations of pandas-on-Spark objects with Spark type: NullType.
"""
@property
def pretty_name(self) -> str:
return "nulls"
def astype(self, index_ops: IndexOpsLike, dtype: Union[str, type, Dtype]) -> IndexOpsLike:
dtype, spark_type = pandas_on_spark_type(dtype)
if isinstance(dtype, CategoricalDtype):
return _as_categorical_type(index_ops, dtype, spark_type)
elif isinstance(spark_type, BooleanType):
return _as_bool_type(index_ops, dtype)
elif isinstance(spark_type, StringType):
return _as_string_type(index_ops, dtype)
else:
return _as_other_type(index_ops, dtype, spark_type)