org.apache.hadoop.hive.ql.optimizer.calcite.rules.HiveRulesRegistry.java Source code

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Here is the source code for org.apache.hadoop.hive.ql.optimizer.calcite.rules.HiveRulesRegistry.java

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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 org.apache.hadoop.hive.ql.optimizer.calcite.rules;

import java.util.Set;

import org.apache.calcite.plan.RelOptRule;
import org.apache.calcite.rel.RelNode;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.SetMultimap;
import com.google.common.collect.Sets;

public class HiveRulesRegistry {

    private SetMultimap<RelOptRule, RelNode> registryVisited;
    private ListMultimap<RelNode, Set<String>> registryPushedPredicates;

    public HiveRulesRegistry() {
        this.registryVisited = HashMultimap.create();
        this.registryPushedPredicates = ArrayListMultimap.create();
    }

    public void registerVisited(RelOptRule rule, RelNode operator) {
        this.registryVisited.put(rule, operator);
    }

    public Set<RelNode> getVisited(RelOptRule rule) {
        return this.registryVisited.get(rule);
    }

    public Set<String> getPushedPredicates(RelNode operator, int pos) {
        if (!this.registryPushedPredicates.containsKey(operator)) {
            for (int i = 0; i < operator.getInputs().size(); i++) {
                this.registryPushedPredicates.get(operator).add(Sets.<String>newHashSet());
            }
        }
        return this.registryPushedPredicates.get(operator).get(pos);
    }

    public void copyPushedPredicates(RelNode operator, RelNode otherOperator) {
        if (this.registryPushedPredicates.containsKey(operator)) {
            for (Set<String> s : this.registryPushedPredicates.get(operator)) {
                this.registryPushedPredicates.put(otherOperator, Sets.newHashSet(s));
            }
        }
    }
}