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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.
#[macro_export]
macro_rules! make_udaf_expr {
($EXPR_FN:ident, $($arg:ident)*, $DOC:expr, $AGGREGATE_UDF_FN:ident) => {
// "fluent expr_fn" style function
#[doc = $DOC]
pub fn $EXPR_FN(
$($arg: datafusion_expr::Expr,)*
) -> datafusion_expr::Expr {
datafusion_expr::Expr::AggregateFunction(datafusion_expr::expr::AggregateFunction::new_udf(
$AGGREGATE_UDF_FN(),
vec![$($arg),*],
false,
None,
vec![],
None,
))
}
};
}
#[macro_export]
macro_rules! make_udaf_expr_and_func {
($UDAF:ty, $EXPR_FN:ident, $($arg:ident)*, $DOC:expr, $AGGREGATE_UDF_FN:ident) => {
make_udaf_expr!($EXPR_FN, $($arg)*, $DOC, $AGGREGATE_UDF_FN);
create_func!($UDAF, $AGGREGATE_UDF_FN);
};
($UDAF:ty, $EXPR_FN:ident, $DOC:expr, $AGGREGATE_UDF_FN:ident) => {
// "fluent expr_fn" style function
#[doc = $DOC]
pub fn $EXPR_FN(
args: Vec<datafusion_expr::Expr>,
) -> datafusion_expr::Expr {
datafusion_expr::Expr::AggregateFunction(datafusion_expr::expr::AggregateFunction::new_udf(
$AGGREGATE_UDF_FN(),
args,
false,
None,
vec![],
None,
))
}
create_func!($UDAF, $AGGREGATE_UDF_FN);
};
}
#[macro_export]
macro_rules! create_func {
($UDAF:ty, $AGGREGATE_UDF_FN:ident) => {
create_func!($UDAF, $AGGREGATE_UDF_FN, <$UDAF>::default());
};
($UDAF:ty, $AGGREGATE_UDF_FN:ident, $CREATE:expr) => {
#[doc = concat!("AggregateFunction that returns a [`AggregateUDF`](datafusion_expr::AggregateUDF) for [`", stringify!($UDAF), "`]")]
pub fn $AGGREGATE_UDF_FN() -> std::sync::Arc<datafusion_expr::AggregateUDF> {
// Singleton instance of [$UDAF], ensures the UDAF is only created once
static INSTANCE: std::sync::LazyLock<std::sync::Arc<datafusion_expr::AggregateUDF>> =
std::sync::LazyLock::new(|| {
std::sync::Arc::new(datafusion_expr::AggregateUDF::from($CREATE))
});
std::sync::Arc::clone(&INSTANCE)
}
}
}