src/expr/placeholder.rs

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// distributed with this work for additional information
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// 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
//
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use datafusion::arrow::datatypes::DataType;
use pyo3::prelude::*;

use crate::common::data_type::PyDataType;

#[pyclass(name = "Placeholder", module = "datafusion.expr", subclass)]
#[derive(Clone)]
pub struct PyPlaceholder {
    id: String,
    data_type: Option<DataType>,
}

impl PyPlaceholder {
    pub fn new(id: String, data_type: DataType) -> Self {
        Self {
            id,
            data_type: Some(data_type),
        }
    }
}

#[pymethods]
impl PyPlaceholder {
    fn id(&self) -> String {
        self.id.clone()
    }

    fn data_type(&self) -> Option<PyDataType> {
        self.data_type.as_ref().map(|e| e.clone().into())
    }
}