hazelcast-master/hazelcast-sql/src/main/java/com/hazelcast/sql/impl/optimizer/SqlOptimizer.java
/*
 * Copyright 2023 Hazelcast Inc.
 *
 * Licensed under the Hazelcast Community License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://hazelcast.com/hazelcast-community-license
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.sql.impl.optimizer;

import com.hazelcast.sql.impl.schema.TableResolver;

import javax.annotation.Nullable;
import java.util.List;

/**
 * Optimizer responsible for conversion of SQL string to executable plan.
 */
public interface SqlOptimizer {

    @Nullable
    default String mappingDdl(String name) {
        return null;
    }

    List<TableResolver> tableResolvers();

    /**
     * Prepare SQL query.
     *
     * @param task Optimization task containing all necessary context.
     * @return Prepared plan.
     */
    SqlPlan prepare(OptimizationTask task);
}
