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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.

"""Col class."""

from datafusion.expr import Expr

class Col:

"""Create a column expression.

This helper class allows an extra syntax of creating columns using the __getattr__

method.

"""

def __call__(self, value: str) -> Expr:

"""Create a column expression."""

return Expr.column(value)

def __getattr__(self, value: str) -> Expr:

"""Create a column using attribute syntax."""

# For autocomplete to work with IPython

if value.startswith("__wrapped__"):

return getattr(type(self), value)

return Expr.column(value)

col: Col = Col()

column: Col = Col()

__all__ = ["col", "column"]