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

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/*
 * 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 com.hazelcast.com.liance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.com.hazelcast.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.RelOptRule;
import com.hazelcast.org.apache.calcite.plan.RelOptRuleCall;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.core.Join;
import com.hazelcast.org.apache.calcite.rel.core.JoinRelType;
import com.hazelcast.org.apache.calcite.rel.core.RelFactories;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalFilter;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalJoin;
import com.hazelcast.org.apache.calcite.tools.RelBuilderFactory;

import com.hazelcast.com.google.com.hazelcast.com.on.collect.ImmutableList;
import com.hazelcast.com.google.com.hazelcast.com.on.collect.ImmutableSet;

/**
 * Planner rule that pushes {@code SemiJoin}s down in a tree past
 * a {@link com.hazelcast.org.apache.calcite.rel.core.Filter}.
 *
 * The intention is to trigger other rules that will convert
 * {@code SemiJoin}s.
 *
 * SemiJoin(LogicalFilter(X), Y) → LogicalFilter(SemiJoin(X, Y))
 *
 * @see SemiJoinProjectTransposeRule
 */
public class SemiJoinFilterTransposeRule extends RelOptRule implements TransformationRule {
  public static final SemiJoinFilterTransposeRule INSTANCE =
      new SemiJoinFilterTransposeRule(RelFactories.LOGICAL_BUILDER);

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

  /**
   * Creates a SemiJoinFilterTransposeRule.
   */
  public SemiJoinFilterTransposeRule(RelBuilderFactory relBuilderFactory) {
    super(
        operandJ(LogicalJoin.class, null, Join::isSemiJoin,
            some(operand(LogicalFilter.class, any()))),
        relBuilderFactory, null);
  }

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

  // implement RelOptRule
  public void onMatch(RelOptRuleCall call) {
    LogicalJoin semiJoin = call.rel(0);
    LogicalFilter filter = call.rel(1);

    RelNode newSemiJoin =
        LogicalJoin.create(filter.getInput(),
            semiJoin.getRight(),
            // No need to copy the hints, the framework would try to do that.
            ImmutableList.of(),
            semiJoin.getCondition(),
            ImmutableSet.of(),
            JoinRelType.SEMI);

    final RelFactories.FilterFactory factory =
        RelFactories.DEFAULT_FILTER_FACTORY;
    RelNode newFilter =
        factory.createFilter(newSemiJoin, filter.getCondition(),
            ImmutableSet.of());

    call.transformTo(newFilter);
  }
}