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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::HigherOrderFunction;
use pyo3::prelude::*;
use super::PyExpr;
#[pyclass(
from_py_object,
frozen,
name = "HigherOrderFunction",
module = "datafusion.expr",
subclass
)]
#[derive(Clone)]
pub struct PyHigherOrderFunction {
higher_order: HigherOrderFunction,
}
impl From<HigherOrderFunction> for PyHigherOrderFunction {
fn from(higher_order: HigherOrderFunction) -> PyHigherOrderFunction {
PyHigherOrderFunction { higher_order }
}
}
impl From<PyHigherOrderFunction> for HigherOrderFunction {
fn from(higher_order: PyHigherOrderFunction) -> Self {
higher_order.higher_order
}
}
impl Display for PyHigherOrderFunction {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(
f,
"HigherOrderFunction(name={}, args={:?})",
self.higher_order.name(),
&self.higher_order.args,
)
}
}
#[pymethods]
impl PyHigherOrderFunction {
/// Name of the higher-order function being invoked.
fn name(&self) -> String {
self.higher_order.name().to_string()
}
/// Arguments passed to the higher-order function. Some entries may be
/// `Lambda` expressions; others are ordinary value expressions.
fn args(&self) -> Vec<PyExpr> {
self.higher_order
.args
.iter()
.map(|e| PyExpr::from(e.clone()))
.collect()
}
fn __repr__(&self) -> PyResult<String> {
Ok(format!("HigherOrderFunction({self})"))
}
fn __name__(&self) -> PyResult<String> {
Ok("HigherOrderFunction".to_string())
}
}