package-info.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.
 */

/**
 * Management of materialized query results.
 *
 * <p>An actor ({@link net.hydromatic.optiq.materialize.MaterializationActor})
 * maintains the state of all
 * materializations in the system and is wrapped in a service
 * ({@link net.hydromatic.optiq.materialize.MaterializationService})
 * for access from other parts of the system.</p>
 *
 * <p>Optimizer rules allow Calcite to rewrite queries using materializations,
 * if they are valid (that is, contain the same result as executing their
 * defining query) and lower cost.
 *
 * <p>In future, the actor may manage the process of updating materializations,
 * instantiating materializations from the intermediate results of queries, and
 * recognize what materializations would be useful based on actual query load.
 */
package net.hydromatic.optiq.materialize;

// End package-info.java