datafusion_python/expr/
higher_order_function.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::HigherOrderFunction;
21use pyo3::prelude::*;
22
23use super::PyExpr;
24
25#[pyclass(
26    from_py_object,
27    frozen,
28    name = "HigherOrderFunction",
29    module = "datafusion.expr",
30    subclass
31)]
32#[derive(Clone)]
33pub struct PyHigherOrderFunction {
34    higher_order: HigherOrderFunction,
35}
36
37impl From<HigherOrderFunction> for PyHigherOrderFunction {
38    fn from(higher_order: HigherOrderFunction) -> PyHigherOrderFunction {
39        PyHigherOrderFunction { higher_order }
40    }
41}
42
43impl From<PyHigherOrderFunction> for HigherOrderFunction {
44    fn from(higher_order: PyHigherOrderFunction) -> Self {
45        higher_order.higher_order
46    }
47}
48
49impl Display for PyHigherOrderFunction {
50    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
51        write!(
52            f,
53            "HigherOrderFunction(name={}, args={:?})",
54            self.higher_order.name(),
55            &self.higher_order.args,
56        )
57    }
58}
59
60#[pymethods]
61impl PyHigherOrderFunction {
62    /// Name of the higher-order function being invoked.
63    fn name(&self) -> String {
64        self.higher_order.name().to_string()
65    }
66
67    /// Arguments passed to the higher-order function. Some entries may be
68    /// `Lambda` expressions; others are ordinary value expressions.
69    fn args(&self) -> Vec<PyExpr> {
70        self.higher_order
71            .args
72            .iter()
73            .map(|e| PyExpr::from(e.clone()))
74            .collect()
75    }
76
77    fn __repr__(&self) -> PyResult<String> {
78        Ok(format!("HigherOrderFunction({self})"))
79    }
80
81    fn __name__(&self) -> PyResult<String> {
82        Ok("HigherOrderFunction".to_string())
83    }
84}
datafusion_python/expr/higher_order_function.rs

datafusion_python/expr/
higher_order_function.rs
