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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.flink.runtime.operators;
import org.apache.flink.api.common.operators.base.OuterJoinOperatorBase.OuterJoinType;
import org.apache.flink.api.common.typeutils.TypeComparator;
import org.apache.flink.api.common.typeutils.TypePairComparatorFactory;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.runtime.io.disk.iomanager.IOManager;
import org.apache.flink.runtime.memory.MemoryManager;
import org.apache.flink.runtime.operators.hash.NonReusingBuildFirstHashJoinIterator;
import org.apache.flink.runtime.operators.hash.NonReusingBuildSecondHashJoinIterator;
import org.apache.flink.runtime.operators.hash.ReusingBuildFirstHashJoinIterator;
import org.apache.flink.runtime.operators.hash.ReusingBuildSecondHashJoinIterator;
import org.apache.flink.runtime.operators.sort.NonReusingMergeOuterJoinIterator;
import org.apache.flink.runtime.operators.sort.ReusingMergeOuterJoinIterator;
import org.apache.flink.runtime.operators.util.JoinTaskIterator;
import org.apache.flink.util.MutableObjectIterator;
/**
* The left outer join driver implements the logic of an outer join operator at runtime. It instantiates a sort-merge based strategy to find
* joining pairs of records or joins records from the left side with null if no match is found.
*/
public class LeftOuterJoinDriver extends AbstractOuterJoinDriver {
@Override
protected JoinTaskIterator getReusingOuterJoinIterator(
DriverStrategy driverStrategy,
MutableObjectIterator in1,
MutableObjectIterator in2,
TypeSerializer serializer1,
TypeComparator comparator1,
TypeSerializer serializer2,
TypeComparator comparator2,
TypePairComparatorFactory pairComparatorFactory,
MemoryManager memoryManager,
IOManager ioManager,
double driverMemFraction
) throws Exception {
switch (driverStrategy) {
case LEFT_OUTER_MERGE:
int numPages = memoryManager.computeNumberOfPages(driverMemFraction);
return new ReusingMergeOuterJoinIterator<>(
OuterJoinType.LEFT,
in1,
in2,
serializer1,
comparator1,
serializer2,
comparator2,
pairComparatorFactory.createComparator12(comparator1, comparator2),
memoryManager,
ioManager,
numPages,
super.taskContext.getContainingTask()
);
case LEFT_HYBRIDHASH_BUILD_FIRST:
return new ReusingBuildFirstHashJoinIterator<>(in1, in2,
serializer1, comparator1,
serializer2, comparator2,
pairComparatorFactory.createComparator21(comparator1, comparator2),
memoryManager, ioManager,
this.taskContext.getContainingTask(),
driverMemFraction,
false,
true,
false);
case LEFT_HYBRIDHASH_BUILD_SECOND:
return new ReusingBuildSecondHashJoinIterator<>(in1, in2,
serializer1, comparator1,
serializer2, comparator2,
pairComparatorFactory.createComparator12(comparator1, comparator2),
memoryManager, ioManager,
this.taskContext.getContainingTask(),
driverMemFraction,
true,
false,
false);
default:
throw new Exception("Unsupported driver strategy for left outer join driver: " + driverStrategy.name());
}
}
@Override
protected JoinTaskIterator getNonReusingOuterJoinIterator(
DriverStrategy driverStrategy,
MutableObjectIterator in1,
MutableObjectIterator in2,
TypeSerializer serializer1,
TypeComparator comparator1,
TypeSerializer serializer2,
TypeComparator comparator2,
TypePairComparatorFactory pairComparatorFactory,
MemoryManager memoryManager,
IOManager ioManager,
double driverMemFraction
) throws Exception {
switch (driverStrategy) {
case LEFT_OUTER_MERGE:
int numPages = memoryManager.computeNumberOfPages(driverMemFraction);
return new NonReusingMergeOuterJoinIterator<>(
OuterJoinType.LEFT,
in1,
in2,
serializer1,
comparator1,
serializer2,
comparator2,
pairComparatorFactory.createComparator12(comparator1, comparator2),
memoryManager,
ioManager,
numPages,
super.taskContext.getContainingTask()
);
case LEFT_HYBRIDHASH_BUILD_FIRST:
return new NonReusingBuildFirstHashJoinIterator<>(in1, in2,
serializer1, comparator1,
serializer2, comparator2,
pairComparatorFactory.createComparator21(comparator1, comparator2),
memoryManager, ioManager,
this.taskContext.getContainingTask(),
driverMemFraction,
false,
true,
false);
case LEFT_HYBRIDHASH_BUILD_SECOND:
return new NonReusingBuildSecondHashJoinIterator<>(in1, in2,
serializer1, comparator1,
serializer2, comparator2,
pairComparatorFactory.createComparator12(comparator1, comparator2),
memoryManager, ioManager,
this.taskContext.getContainingTask(),
driverMemFraction,
true,
false,
false);
default:
throw new Exception("Unsupported driver strategy for left outer join driver: " + driverStrategy.name());
}
}
}
