org.apache.hadoop.hive.ql.exec.vector.VectorFilterOperator Maven / Gradle / Ivy
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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.exec.vector;
import java.util.Collection;
import java.util.concurrent.Future;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.exec.FilterOperator;
import org.apache.hadoop.hive.ql.exec.vector.expressions.ConstantVectorExpression;
import org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.plan.ExprNodeDesc;
import org.apache.hadoop.hive.ql.plan.FilterDesc;
import org.apache.hadoop.hive.ql.plan.OperatorDesc;
/**
* Filter operator implementation.
**/
public class VectorFilterOperator extends FilterOperator {
private static final long serialVersionUID = 1L;
private VectorExpression conditionEvaluator = null;
// Temporary selected vector
private transient int[] temporarySelected;
// filterMode is 1 if condition is always true, -1 if always false
// and 0 if condition needs to be computed.
transient private int filterMode = 0;
public VectorFilterOperator(VectorizationContext vContext, OperatorDesc conf)
throws HiveException {
this();
ExprNodeDesc oldExpression = ((FilterDesc) conf).getPredicate();
conditionEvaluator = vContext.getVectorExpression(oldExpression, VectorExpressionDescriptor.Mode.FILTER);
this.conf = (FilterDesc) conf;
}
public VectorFilterOperator() {
super();
}
@Override
protected Collection> initializeOp(Configuration hconf) throws HiveException {
Collection> result = super.initializeOp(hconf);
try {
heartbeatInterval = HiveConf.getIntVar(hconf,
HiveConf.ConfVars.HIVESENDHEARTBEAT);
} catch (Throwable e) {
throw new HiveException(e);
}
if (conditionEvaluator instanceof ConstantVectorExpression) {
ConstantVectorExpression cve = (ConstantVectorExpression) this.conditionEvaluator;
if (cve.getLongValue() == 1) {
filterMode = 1;
} else {
filterMode = -1;
}
}
temporarySelected = new int [VectorizedRowBatch.DEFAULT_SIZE];
return result;
}
public void setFilterCondition(VectorExpression expr) {
this.conditionEvaluator = expr;
}
@Override
public void process(Object row, int tag) throws HiveException {
VectorizedRowBatch vrg = (VectorizedRowBatch) row;
//The selected vector represents selected rows.
//Clone the selected vector
System.arraycopy(vrg.selected, 0, temporarySelected, 0, vrg.size);
int [] selectedBackup = vrg.selected;
vrg.selected = temporarySelected;
int sizeBackup = vrg.size;
boolean selectedInUseBackup = vrg.selectedInUse;
//Evaluate the predicate expression
switch (filterMode) {
case 0:
conditionEvaluator.evaluate(vrg);
break;
case -1:
// All will be filtered out
vrg.size = 0;
break;
case 1:
default:
// All are selected, do nothing
}
if (vrg.size > 0) {
forward(vrg, null);
}
// Restore the original selected vector
vrg.selected = selectedBackup;
vrg.size = sizeBackup;
vrg.selectedInUse = selectedInUseBackup;
}
static public String getOperatorName() {
return "FIL";
}
public VectorExpression getConditionEvaluator() {
return conditionEvaluator;
}
public void setConditionEvaluator(VectorExpression conditionEvaluator) {
this.conditionEvaluator = conditionEvaluator;
}
}