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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 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.RelOptRuleCall;
import com.hazelcast.org.apache.calcite.plan.RelRule;
import com.hazelcast.org.apache.calcite.rel.core.Join;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalJoin;
import com.hazelcast.org.apache.calcite.tools.RelBuilderFactory;

import org.immutables.value.Value;

/**
 * Planner rule that removes a {@link Join#isSemiJoin semi-join} from a join
 * tree.
 *
 * 

It is invoked after attempts have been made to convert a SemiJoin to an * indexed scan on a join factor have failed. Namely, if the join factor does * not reduce to a single table that can be scanned using an index. * *

It should only be enabled if all SemiJoins in the plan are advisory; that * is, they can be safely dropped without affecting the semantics of the query. * * @see CoreRules#SEMI_JOIN_REMOVE */ @Value.Enclosing public class SemiJoinRemoveRule extends RelRule implements TransformationRule { /** Creates a SemiJoinRemoveRule. */ protected SemiJoinRemoveRule(Config config) { super(config); } @Deprecated // to be removed before 2.0 public SemiJoinRemoveRule(RelBuilderFactory relBuilderFactory) { this(Config.DEFAULT.withRelBuilderFactory(relBuilderFactory) .as(Config.class)); } //~ Methods ---------------------------------------------------------------- @Override public void onMatch(RelOptRuleCall call) { call.transformTo(call.rel(0).getInput(0)); } /** Rule configuration. */ @Value.Immutable public interface Config extends RelRule.Config { Config DEFAULT = ImmutableSemiJoinRemoveRule.Config.of() .withOperandFor(LogicalJoin.class); @Override default SemiJoinRemoveRule toRule() { return new SemiJoinRemoveRule(this); } /** Defines an operand tree for the given classes. */ default Config withOperandFor(Class joinClass) { return withOperandSupplier(b -> b.operand(joinClass).predicate(Join::isSemiJoin).anyInputs()) .as(Config.class); } } }





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