datafusion_python/expr/
placeholder.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 arrow::datatypes::Field;
19use arrow::pyarrow::PyArrowType;
20use datafusion::logical_expr::expr::Placeholder;
21use pyo3::prelude::*;
22
23use crate::common::data_type::PyDataType;
24
25#[pyclass(
26    from_py_object,
27    frozen,
28    name = "Placeholder",
29    module = "datafusion.expr",
30    subclass
31)]
32#[derive(Clone)]
33pub struct PyPlaceholder {
34    placeholder: Placeholder,
35}
36
37impl From<Placeholder> for PyPlaceholder {
38    fn from(placeholder: Placeholder) -> Self {
39        PyPlaceholder { placeholder }
40    }
41}
42
43#[pymethods]
44impl PyPlaceholder {
45    fn id(&self) -> String {
46        self.placeholder.id.clone()
47    }
48
49    fn data_type(&self) -> Option<PyDataType> {
50        self.placeholder
51            .field
52            .as_ref()
53            .map(|f| f.data_type().clone().into())
54    }
55
56    fn field(&self) -> Option<PyArrowType<Field>> {
57        self.placeholder
58            .field
59            .as_ref()
60            .map(|f| f.as_ref().clone().into())
61    }
62}
datafusion_python/expr/placeholder.rs

datafusion_python/expr/
placeholder.rs
