LambdaBinding.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.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.Slot;
import org.apache.doris.nereids.trees.expressions.functions.scalar.Lambda;

import com.google.common.collect.ImmutableList;

import java.util.List;

/** Mapping between SQL lambda parameters and the lambda arguments used during execution. */
public interface LambdaBinding {

    List<Slot> getAnalysisSlots();

    Lambda close(Expression analyzedBody);

    /**
     * Non-lambda inputs that the function still needs after binding. Higher-order functions drop
     * their array inputs because the arrays live in the lambda argument references, but a scalar
     * configuration argument (for example the ascending flag of array_sorted_merge) has to stay.
     */
    default List<Expression> getExtraInputs() {
        return ImmutableList.of();
    }
}