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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 std::fmt::{Display, Formatter};
use datafusion::logical_expr::expr::AggregateFunction;
use pyo3::prelude::*;
use crate::expr::PyExpr;
#[pyclass(
from_py_object,
frozen,
name = "AggregateFunction",
module = "datafusion.expr",
subclass
)]
#[derive(Clone)]
pub struct PyAggregateFunction {
aggr: AggregateFunction,
}
impl From<PyAggregateFunction> for AggregateFunction {
fn from(aggr: PyAggregateFunction) -> Self {
aggr.aggr
}
}
impl From<AggregateFunction> for PyAggregateFunction {
fn from(aggr: AggregateFunction) -> PyAggregateFunction {
PyAggregateFunction { aggr }
}
}
impl Display for PyAggregateFunction {
fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
let args: Vec<String> = self
.aggr
.params
.args
.iter()
.map(|expr| expr.to_string())
.collect();
write!(f, "{}({})", self.aggr.func.name(), args.join(", "))
}
}
#[pymethods]
impl PyAggregateFunction {
/// Get the aggregate type, such as "MIN", or "MAX"
fn aggregate_type(&self) -> String {
self.aggr.func.name().to_string()
}
/// is this a distinct aggregate such as `COUNT(DISTINCT expr)`
fn is_distinct(&self) -> bool {
self.aggr.params.distinct
}
/// Get the arguments to the aggregate function
fn args(&self) -> Vec<PyExpr> {
self.aggr
.params
.args
.iter()
.map(|expr| PyExpr::from(expr.clone()))
.collect()
}
/// Get a String representation of this column
fn __repr__(&self) -> String {
format!("{self}")
}
}