content: /*
   * 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.calcite.rel.rules.materialize;
  
  import org.apache.calcite.plan.RelOptRule;
  import org.apache.calcite.rel.core.Aggregate;
  import org.apache.calcite.rel.core.Filter;
  import org.apache.calcite.rel.core.Join;
  import org.apache.calcite.rel.core.Project;
  import org.apache.calcite.rel.core.TableScan;
  import org.apache.calcite.rel.rules.MaterializedViewFilterScanRule;
  
  /**
   * Collection of rules pertaining to materialized views.
   *
   * <p>Also may contain utilities for {@link MaterializedViewRule}.
   */
  public abstract class MaterializedViewRules {
    private MaterializedViewRules() {}
  
    /** Rule that matches {@link Project} on {@link Aggregate}. */
    public static final RelOptRule PROJECT_AGGREGATE =
        MaterializedViewProjectAggregateRule.Config.DEFAULT.toRule();
  
    /** Rule that matches {@link Aggregate}. */
    public static final RelOptRule AGGREGATE =
        MaterializedViewOnlyAggregateRule.Config.DEFAULT.toRule();
  
    /** Rule that matches {@link Filter}. */
    public static final RelOptRule FILTER =
        MaterializedViewOnlyFilterRule.Config.DEFAULT.toRule();
  
    /** Rule that matches {@link Join}. */
    public static final RelOptRule JOIN =
        MaterializedViewOnlyJoinRule.Config.DEFAULT.toRule();
  
    /** Rule that matches {@link Project} on {@link Filter}. */
    public static final RelOptRule PROJECT_FILTER =
        MaterializedViewProjectFilterRule.Config.DEFAULT.toRule();
  
    /** Rule that matches {@link Project} on {@link Join}. */
    public static final RelOptRule PROJECT_JOIN =
        MaterializedViewProjectJoinRule.Config.DEFAULT.toRule();
  
    /** Rule that converts a {@link Filter} on a {@link TableScan}
     * to a {@link Filter} on a Materialized View. */
    public static final MaterializedViewFilterScanRule FILTER_SCAN =
        MaterializedViewFilterScanRule.Config.DEFAULT.toRule();
  }
  