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(frozen, name = "Placeholder", module = "datafusion.expr", subclass)]
26#[derive(Clone)]
27pub struct PyPlaceholder {
28    placeholder: Placeholder,
29}
30
31impl From<Placeholder> for PyPlaceholder {
32    fn from(placeholder: Placeholder) -> Self {
33        PyPlaceholder { placeholder }
34    }
35}
36
37#[pymethods]
38impl PyPlaceholder {
39    fn id(&self) -> String {
40        self.placeholder.id.clone()
41    }
42
43    fn data_type(&self) -> Option<PyDataType> {
44        self.placeholder
45            .field
46            .as_ref()
47            .map(|f| f.data_type().clone().into())
48    }
49
50    fn field(&self) -> Option<PyArrowType<Field>> {
51        self.placeholder
52            .field
53            .as_ref()
54            .map(|f| f.as_ref().clone().into())
55    }
56}
datafusion_python/expr/placeholder.rs

datafusion_python/expr/
placeholder.rs
