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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::Lambda;
use pyo3::prelude::*;
use super::PyExpr;
#[pyclass(
from_py_object,
frozen,
name = "Lambda",
module = "datafusion.expr",
subclass
)]
#[derive(Clone)]
pub struct PyLambda {
lambda: Lambda,
}
impl From<Lambda> for PyLambda {
fn from(lambda: Lambda) -> PyLambda {
PyLambda { lambda }
}
}
impl From<PyLambda> for Lambda {
fn from(lambda: PyLambda) -> Self {
lambda.lambda
}
}
impl Display for PyLambda {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(
f,
"Lambda(params={:?}, body={:?})",
&self.lambda.params, &self.lambda.body,
)
}
}
#[pymethods]
impl PyLambda {
/// Parameter names of the lambda.
fn params(&self) -> Vec<String> {
self.lambda.params.clone()
}
/// Body expression of the lambda.
fn body(&self) -> PyExpr {
(*self.lambda.body).clone().into()
}
fn __repr__(&self) -> PyResult<String> {
Ok(format!("Lambda({self})"))
}
fn __name__(&self) -> PyResult<String> {
Ok("Lambda".to_string())
}
}