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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.drill.exec.physical.impl.filter;
import javax.inject.Named;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.ops.FragmentContext;
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.selection.SelectionVector2;
public abstract class FilterTemplate2 implements Filterer{
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(FilterTemplate2.class);
private SelectionVector2 outgoingSelectionVector;
private SelectionVector2 incomingSelectionVector;
private SelectionVectorMode svMode;
private TransferPair[] transfers;
@Override
public void setup(FragmentContext context, RecordBatch incoming, RecordBatch outgoing, TransferPair[] transfers) throws SchemaChangeException{
this.transfers = transfers;
this.outgoingSelectionVector = outgoing.getSelectionVector2();
this.svMode = incoming.getSchema().getSelectionVectorMode();
switch(svMode){
case NONE:
break;
case TWO_BYTE:
this.incomingSelectionVector = incoming.getSelectionVector2();
break;
default:
// SV4 is handled in FilterTemplate4
throw new UnsupportedOperationException();
}
doSetup(context, incoming, outgoing);
}
private void doTransfers(){
for(TransferPair t : transfers){
t.transfer();
}
}
public void filterBatch(int recordCount){
if (! outgoingSelectionVector.allocateNew(recordCount)) {
throw new UnsupportedOperationException("Unable to allocate filter batch");
}
switch(svMode){
case NONE:
filterBatchNoSV(recordCount);
break;
case TWO_BYTE:
filterBatchSV2(recordCount);
break;
default:
throw new UnsupportedOperationException();
}
doTransfers();
}
private void filterBatchSV2(int recordCount){
int svIndex = 0;
final int count = recordCount;
for(int i = 0; i < count; i++){
char index = incomingSelectionVector.getIndex(i);
if(doEval(i, 0)){
outgoingSelectionVector.setIndex(svIndex, index);
svIndex++;
}
}
outgoingSelectionVector.setRecordCount(svIndex);
}
private void filterBatchNoSV(int recordCount){
int svIndex = 0;
for(int i = 0; i < recordCount; i++){
if(doEval(i, 0)){
outgoingSelectionVector.setIndex(svIndex, (char)i);
svIndex++;
}
}
outgoingSelectionVector.setRecordCount(svIndex);
}
public abstract void doSetup(@Named("context") FragmentContext context, @Named("incoming") RecordBatch incoming, @Named("outgoing") RecordBatch outgoing);
public abstract boolean doEval(@Named("inIndex") int inIndex, @Named("outIndex") int outIndex);
}
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