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alias.rs
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67 lines (59 loc) · 1.82 KB
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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 crate::expr::PyExpr;
use pyo3::prelude::*;
use std::fmt::{self, Display, Formatter};
use datafusion_expr::Expr;
#[pyclass(name = "Alias", module = "datafusion.expr", subclass)]
#[derive(Clone)]
pub struct PyAlias {
expr: PyExpr,
alias_name: String,
}
impl Display for PyAlias {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(
f,
"Alias
\nExpr: `{:?}`
\nAlias Name: `{}`",
&self.expr, &self.alias_name
)
}
}
impl PyAlias {
pub fn new(expr: &Expr, alias_name: &String) -> Self {
Self {
expr: expr.clone().into(),
alias_name: alias_name.to_owned(),
}
}
}
#[pymethods]
impl PyAlias {
/// Retrieve the "name" of the alias
fn alias(&self) -> PyResult<String> {
Ok(self.alias_name.clone())
}
fn expr(&self) -> PyResult<PyExpr> {
Ok(self.expr.clone())
}
/// Get a String representation of this column
fn __repr__(&self) -> String {
format!("{}", self)
}
}