datafusion_python/expr/
lambda.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18use std::fmt::{self, Display, Formatter};
19
20use datafusion::logical_expr::expr::Lambda;
21use pyo3::prelude::*;
22
23use super::PyExpr;
24
25#[pyclass(
26    from_py_object,
27    frozen,
28    name = "Lambda",
29    module = "datafusion.expr",
30    subclass
31)]
32#[derive(Clone)]
33pub struct PyLambda {
34    lambda: Lambda,
35}
36
37impl From<Lambda> for PyLambda {
38    fn from(lambda: Lambda) -> PyLambda {
39        PyLambda { lambda }
40    }
41}
42
43impl From<PyLambda> for Lambda {
44    fn from(lambda: PyLambda) -> Self {
45        lambda.lambda
46    }
47}
48
49impl Display for PyLambda {
50    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
51        write!(
52            f,
53            "Lambda(params={:?}, body={:?})",
54            &self.lambda.params, &self.lambda.body,
55        )
56    }
57}
58
59#[pymethods]
60impl PyLambda {
61    /// Parameter names of the lambda.
62    fn params(&self) -> Vec<String> {
63        self.lambda.params.clone()
64    }
65
66    /// Body expression of the lambda.
67    fn body(&self) -> PyExpr {
68        (*self.lambda.body).clone().into()
69    }
70
71    fn __repr__(&self) -> PyResult<String> {
72        Ok(format!("Lambda({self})"))
73    }
74
75    fn __name__(&self) -> PyResult<String> {
76        Ok("Lambda".to_string())
77    }
78}
datafusion_python/expr/lambda.rs

datafusion_python/expr/
lambda.rs
