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registry.rs
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registry.rs
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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::collections::HashSet;
use crate::error::Result;
use crate::physical_plan::udaf::AggregateUDF;
use crate::physical_plan::udf::ScalarUDF;
/// A registry knows how to build logical expressions out of user-defined function' names
pub trait FunctionRegistry {
/// Set of all available udfs.
fn udfs(&self) -> HashSet<String>;
/// Returns a reference to the udf named `name`.
fn udf(&self, name: &str) -> Result<&ScalarUDF>;
/// Returns a reference to the udaf named `name`.
fn udaf(&self, name: &str) -> Result<&AggregateUDF>;
}