CustomSignature.java

// 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.

package org.apache.doris.nereids.trees.expressions.functions;

import org.apache.doris.catalog.FunctionSignature;

import com.google.common.collect.ImmutableList;

import java.util.List;

/** CustomSignature */
public interface CustomSignature extends ComputeSignature {

    // custom generate a function signature.
    FunctionSignature customSignature();

    @Override
    default List<FunctionSignature> getSignatures() {
        return ImmutableList.of(customSignature());
    }

    // use the first signature as the candidate signature.
    @Override
    default FunctionSignature searchSignature(List<FunctionSignature> signatures) {
        return signatures.get(0);
    }
}