src/common/df_schema.rs

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// 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
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use std::sync::Arc;

use datafusion_common::DFSchema;
use pyo3::prelude::*;

#[derive(Debug, Clone)]
#[pyclass(name = "DFSchema", module = "datafusion.common", subclass)]
pub struct PyDFSchema {
    schema: Arc<DFSchema>,
}

impl From<PyDFSchema> for DFSchema {
    fn from(schema: PyDFSchema) -> DFSchema {
        (*schema.schema).clone()
    }
}

impl From<DFSchema> for PyDFSchema {
    fn from(schema: DFSchema) -> PyDFSchema {
        PyDFSchema {
            schema: Arc::new(schema),
        }
    }
}

#[pymethods]
impl PyDFSchema {
    #[pyo3(name = "empty")]
    #[staticmethod]
    fn py_empty() -> PyResult<Self> {
        Ok(Self {
            schema: Arc::new(DFSchema::empty()),
        })
    }
}