com.hazelcast.org.apache.calcite.rel.rules.FilterMergeRule Maven / Gradle / Ivy

/*
 * 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 com.hazelcast.org.apache.calcite.rel.rules;

import com.hazelcast.org.apache.calcite.plan.Contexts;
import com.hazelcast.org.apache.calcite.plan.RelOptRule;
import com.hazelcast.org.apache.calcite.plan.RelOptRuleCall;
import com.hazelcast.org.apache.calcite.rel.core.Filter;
import com.hazelcast.org.apache.calcite.rel.core.RelFactories;
import com.hazelcast.org.apache.calcite.tools.RelBuilder;
import com.hazelcast.org.apache.calcite.tools.RelBuilderFactory;

/**
 * Planner rule that combines two
 * {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalFilter}s.
 */
public class FilterMergeRule extends RelOptRule implements SubstitutionRule {
  public static final FilterMergeRule INSTANCE =
      new FilterMergeRule(RelFactories.LOGICAL_BUILDER);

  //~ Constructors -----------------------------------------------------------

  /**
   * Creates a FilterMergeRule.
   */
  public FilterMergeRule(RelBuilderFactory relBuilderFactory) {
    super(
        operand(Filter.class,
            operand(Filter.class, any())),
        relBuilderFactory, null);
  }

  @Deprecated // to be removed before 2.0
  public FilterMergeRule(RelFactories.FilterFactory filterFactory) {
    this(RelBuilder.proto(Contexts.of(filterFactory)));
  }

  //~ Methods ----------------------------------------------------------------

  public void onMatch(RelOptRuleCall call) {
    final Filter topFilter = call.rel(0);
    final Filter bottomFilter = call.rel(1);

    final RelBuilder relBuilder = call.builder();
    relBuilder.push(bottomFilter.getInput())
        .filter(bottomFilter.getCondition(), topFilter.getCondition());

    call.transformTo(relBuilder.build());
  }

}