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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.RelNode;
import com.hazelcast.org.apache.calcite.rel.core.Join;
import com.hazelcast.org.apache.calcite.rel.core.JoinInfo;
import com.hazelcast.org.apache.calcite.rel.core.JoinRelType;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalJoin;
import com.hazelcast.org.apache.calcite.tools.RelBuilderFactory;

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

import org.immutables.value.Value;

/**
 * Rule to add a semi-join into a join. Transformation is as follows:
 *
 * 

LogicalJoin(X, Y) → LogicalJoin(SemiJoin(X, Y), Y) * *

Can be configured to match any sub-class of * {@link com.hazelcast.org.apache.calcite.rel.core.Join}, not just * {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalJoin}. * * @see CoreRules#JOIN_ADD_REDUNDANT_SEMI_JOIN */ @Value.Enclosing public class JoinAddRedundantSemiJoinRule extends RelRule implements TransformationRule { /** Creates a JoinAddRedundantSemiJoinRule. */ protected JoinAddRedundantSemiJoinRule(Config config) { super(config); } @Deprecated // to be removed before 2.0 public JoinAddRedundantSemiJoinRule(Class clazz, RelBuilderFactory relBuilderFactory) { this(Config.DEFAULT.withRelBuilderFactory(relBuilderFactory) .as(Config.class) .withOperandFor(clazz)); } //~ Methods ---------------------------------------------------------------- @Override public void onMatch(RelOptRuleCall call) { Join origJoinRel = call.rel(0); if (origJoinRel.isSemiJoinDone()) { return; } // can't process outer joins using semi-joins if (origJoinRel.getJoinType() != JoinRelType.INNER) { return; } // determine if we have a valid join condition final JoinInfo joinInfo = origJoinRel.analyzeCondition(); if (joinInfo.leftKeys.size() == 0) { return; } RelNode semiJoin = LogicalJoin.create(origJoinRel.getLeft(), origJoinRel.getRight(), ImmutableList.of(), origJoinRel.getCondition(), ImmutableSet.of(), JoinRelType.SEMI); RelNode newJoinRel = origJoinRel.copy( origJoinRel.getTraitSet(), origJoinRel.getCondition(), semiJoin, origJoinRel.getRight(), JoinRelType.INNER, true); call.transformTo(newJoinRel); } /** Rule configuration. */ @Value.Immutable public interface Config extends RelRule.Config { Config DEFAULT = ImmutableJoinAddRedundantSemiJoinRule.Config.of() .withOperandFor(LogicalJoin.class); @Override default JoinAddRedundantSemiJoinRule toRule() { return new JoinAddRedundantSemiJoinRule(this); } /** Defines an operand tree for the given classes. */ default Config withOperandFor(Class joinClass) { return withOperandSupplier(b -> b.operand(joinClass).anyInputs()) .as(Config.class); } } }





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