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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.
use std::fmt::{self, Display, Formatter};
use datafusion::logical_expr::expr::Alias;
use pyo3::prelude::*;
use crate::expr::PyExpr;
#[pyclass(
from_py_object,
frozen,
name = "Alias",
module = "datafusion.expr",
subclass
)]
#[derive(Clone)]
pub struct PyAlias {
alias: Alias,
}
impl From<Alias> for PyAlias {
fn from(alias: Alias) -> Self {
Self { alias }
}
}
impl From<PyAlias> for Alias {
fn from(py_alias: PyAlias) -> Self {
py_alias.alias
}
}
impl Display for PyAlias {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(
f,
"Alias
\nExpr: `{:?}`
\nAlias Name: `{}`",
&self.alias.expr, &self.alias.name
)
}
}
#[pymethods]
impl PyAlias {
/// Retrieve the "name" of the alias
fn alias(&self) -> PyResult<String> {
Ok(self.alias.name.clone())
}
fn expr(&self) -> PyResult<PyExpr> {
Ok((*self.alias.expr.clone()).into())
}
/// Get a String representation of this column
fn __repr__(&self) -> String {
format!("{self}")
}
}