/*
* 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.drill.exec.physical.impl.svremover;
import java.io.IOException;
import java.util.List;
import org.apache.drill.exec.exception.ClassTransformationException;
import org.apache.drill.exec.exception.OutOfMemoryException;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.expr.CodeGenerator;
import org.apache.drill.exec.memory.BufferAllocator;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.physical.config.SelectionVectorRemover;
import org.apache.drill.exec.record.AbstractSingleRecordBatch;
import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.record.TransferPair;
import org.apache.drill.exec.record.VectorContainer;
import org.apache.drill.exec.record.VectorWrapper;
import org.apache.drill.exec.record.WritableBatch;
import org.apache.drill.exec.vector.CopyUtil;
import org.apache.drill.exec.vector.SchemaChangeCallBack;
import org.apache.drill.exec.vector.ValueVector;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
public class RemovingRecordBatch extends AbstractSingleRecordBatch<SelectionVectorRemover>{
private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(RemovingRecordBatch.class);
private Copier copier;
private int recordCount;
private boolean hasRemainder;
private int remainderIndex;
public RemovingRecordBatch(SelectionVectorRemover popConfig, FragmentContext context, RecordBatch incoming) throws OutOfMemoryException {
super(popConfig, context, incoming);
logger.debug("Created.");
}
@Override
public int getRecordCount() {
return recordCount;
}
@Override
protected boolean setupNewSchema() throws SchemaChangeException {
container.clear();
switch(incoming.getSchema().getSelectionVectorMode()){
case NONE:
this.copier = getStraightCopier();
break;
case TWO_BYTE:
this.copier = getGenerated2Copier();
break;
case FOUR_BYTE:
this.copier = getGenerated4Copier();
break;
default:
throw new UnsupportedOperationException();
}
if (container.isSchemaChanged()) {
container.buildSchema(SelectionVectorMode.NONE);
return true;
}
return false;
}
@Override
public IterOutcome innerNext() {
if (hasRemainder) {
handleRemainder();
return IterOutcome.OK;
}
return super.innerNext();
}
@Override
protected IterOutcome doWork() {
int incomingRecordCount = incoming.getRecordCount();
int copiedRecords;
try {
copiedRecords = copier.copyRecords(0, incomingRecordCount);
} catch (SchemaChangeException e) {
throw new IllegalStateException(e);
}
if (copiedRecords < incomingRecordCount) {
for(VectorWrapper<?> v : container){
ValueVector.Mutator m = v.getValueVector().getMutator();
m.setValueCount(copiedRecords);
}
hasRemainder = true;
remainderIndex = copiedRecords;
this.recordCount = remainderIndex;
} else {
recordCount = copiedRecords;
for(VectorWrapper<?> v : container){
ValueVector.Mutator m = v.getValueVector().getMutator();
m.setValueCount(recordCount);
}
if (incoming.getSchema().getSelectionVectorMode() != SelectionVectorMode.FOUR_BYTE) {
for(VectorWrapper<?> v: incoming) {
v.clear();
}
if (incoming.getSchema().getSelectionVectorMode() == SelectionVectorMode.TWO_BYTE) {
incoming.getSelectionVector2().clear();
}
}
}
assert recordCount >= copiedRecords;
logger.debug("doWork(): {} records copied out of {}, remaining: {}, incoming schema {} ",
copiedRecords,
incomingRecordCount,
incomingRecordCount - remainderIndex,
incoming.getSchema());
return IterOutcome.OK;
}
private void handleRemainder() {
int recordCount = incoming.getRecordCount();
int remainingRecordCount = incoming.getRecordCount() - remainderIndex;
int copiedRecords;
try {
while((copiedRecords = copier.copyRecords(remainderIndex, remainingRecordCount)) == 0) {
logger.debug("Copied zero records. Retrying");
container.zeroVectors();
}
} catch (SchemaChangeException e) {
throw new IllegalStateException(e);
}
/*
StringBuilder builder = new StringBuilder();
for (VectorWrapper w : container) {
builder.append(w.getField().getPath());
builder.append(" Value capacity: ");
builder.append(w.getValueVector().getValueCapacity());
if (w.getValueVector() instanceof VariableWidthVector) {
builder.append(" Byte capacity: ");
builder.append(((VariableWidthVector) w.getValueVector()).getByteCapacity());
builder.append("\n");
}
}
logger.debug(builder.toString());
*/
if (copiedRecords < remainingRecordCount) {
for(VectorWrapper<?> v : container){
ValueVector.Mutator m = v.getValueVector().getMutator();
m.setValueCount(copiedRecords);
}
remainderIndex += copiedRecords;
this.recordCount = copiedRecords;
} else {
for(VectorWrapper<?> v : container){
ValueVector.Mutator m = v.getValueVector().getMutator();
m.setValueCount(remainingRecordCount);
this.recordCount = remainingRecordCount;
}
if (incoming.getSchema().getSelectionVectorMode() != SelectionVectorMode.FOUR_BYTE) {
for(VectorWrapper<?> v: incoming) {
v.clear();
}
}
remainderIndex = 0;
hasRemainder = false;
}
logger.debug(String.format("handleRemainder(): %s records copied out of %s, remaining: %s, incoming schema %s ",
copiedRecords,
recordCount,
recordCount - remainderIndex,
incoming.getSchema()));
}
@Override
public void close() {
super.close();
}
private class StraightCopier implements Copier{
private List<TransferPair> pairs = Lists.newArrayList();
@Override
public void setupRemover(FragmentContext context, RecordBatch incoming, RecordBatch outgoing){
for(VectorWrapper<?> vv : incoming){
TransferPair tp = vv.getValueVector().makeTransferPair(container.addOrGet(vv.getField(), callBack));
pairs.add(tp);
}
}
@Override
public int copyRecords(int index, int recordCount) {
assert index == 0 && recordCount == incoming.getRecordCount() : "Straight copier cannot split batch";
for(TransferPair tp : pairs){
tp.transfer();
}
return recordCount;
}
}
private Copier getStraightCopier(){
StraightCopier copier = new StraightCopier();
copier.setupRemover(context, incoming, this);
return copier;
}
private Copier getGenerated2Copier() throws SchemaChangeException{
Preconditions.checkArgument(incoming.getSchema().getSelectionVectorMode() == SelectionVectorMode.TWO_BYTE);
for(VectorWrapper<?> vv : incoming){
vv.getValueVector().makeTransferPair(container.addOrGet(vv.getField(), callBack));
}
try {
final CodeGenerator<Copier> cg = CodeGenerator.get(Copier.TEMPLATE_DEFINITION2, context.getFunctionRegistry(), context.getOptions());
CopyUtil.generateCopies(cg.getRoot(), incoming, false);
Copier copier = context.getImplementationClass(cg);
copier.setupRemover(context, incoming, this);
cg.plainJavaCapable(true);
// Uncomment out this line to debug the generated code.
// cg.saveCodeForDebugging(true);
return copier;
} catch (ClassTransformationException | IOException e) {
throw new SchemaChangeException("Failure while attempting to load generated class", e);
}
}
private Copier getGenerated4Copier() throws SchemaChangeException {
Preconditions.checkArgument(incoming.getSchema().getSelectionVectorMode() == SelectionVectorMode.FOUR_BYTE);
return getGenerated4Copier(incoming, context, oContext.getAllocator(), container, this, callBack);
}
public static Copier getGenerated4Copier(RecordBatch batch, FragmentContext context, BufferAllocator allocator, VectorContainer container, RecordBatch outgoing, SchemaChangeCallBack callBack) throws SchemaChangeException{
for(VectorWrapper<?> vv : batch){
@SuppressWarnings("resource")
ValueVector v = vv.getValueVectors()[0];
v.makeTransferPair(container.addOrGet(v.getField(), callBack));
}
try {
final CodeGenerator<Copier> cg = CodeGenerator.get(Copier.TEMPLATE_DEFINITION4, context.getFunctionRegistry(), context.getOptions());
CopyUtil.generateCopies(cg.getRoot(), batch, true);
cg.plainJavaCapable(true);
// Uncomment out this line to debug the generated code.
// cg.saveCodeForDebugging(true);
Copier copier = context.getImplementationClass(cg);
copier.setupRemover(context, batch, outgoing);
return copier;
} catch (ClassTransformationException | IOException e) {
throw new SchemaChangeException("Failure while attempting to load generated class", e);
}
}
@Override
public WritableBatch getWritableBatch() {
return WritableBatch.get(this);
}
}