org.apache.hadoop.hive.ql.exec.vector.VectorFilterOperator Maven / Gradle / Ivy
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* 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,
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package org.apache.hadoop.hive.ql.exec.vector;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.CompilationOpContext;
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;
import org.apache.hadoop.hive.ql.plan.VectorDesc;
import org.apache.hadoop.hive.ql.plan.VectorFilterDesc;
import com.google.common.annotations.VisibleForTesting;
/**
* Filter operator implementation.
**/
public class VectorFilterOperator extends FilterOperator
implements VectorizationOperator{
private static final long serialVersionUID = 1L;
private VectorizationContext vContext;
private VectorFilterDesc vectorDesc;
private VectorExpression predicateExpression = 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(CompilationOpContext ctx, OperatorDesc conf,
VectorizationContext vContext, VectorDesc vectorDesc)
throws HiveException {
this(ctx);
this.conf = (FilterDesc) conf;
this.vContext = vContext;
this.vectorDesc = (VectorFilterDesc) vectorDesc;
predicateExpression = this.vectorDesc.getPredicateExpression();
}
/** Kryo ctor. */
@VisibleForTesting
public VectorFilterOperator() {
super();
}
public VectorFilterOperator(CompilationOpContext ctx) {
super(ctx);
}
@Override
public VectorizationContext getInputVectorizationContext() {
return vContext;
}
@Override
protected void initializeOp(Configuration hconf) throws HiveException {
super.initializeOp(hconf);
VectorExpression.doTransientInit(predicateExpression, hconf);
try {
heartbeatInterval = HiveConf.getIntVar(hconf,
HiveConf.ConfVars.HIVESENDHEARTBEAT);
predicateExpression.init(hconf);
} catch (Throwable e) {
throw new HiveException(e);
}
if (predicateExpression instanceof ConstantVectorExpression) {
ConstantVectorExpression cve = (ConstantVectorExpression) this.predicateExpression;
if (cve.getLongValue() == 1) {
filterMode = 1;
} else {
filterMode = -1;
}
}
temporarySelected = new int [VectorizedRowBatch.DEFAULT_SIZE];
}
public void setFilterCondition(VectorExpression expr) {
this.predicateExpression = 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.selected.length);
int [] selectedBackup = vrg.selected;
vrg.selected = temporarySelected;
int sizeBackup = vrg.size;
boolean selectedInUseBackup = vrg.selectedInUse;
//Evaluate the predicate expression
switch (filterMode) {
case 0:
predicateExpression.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) {
vectorForward(vrg);
}
// Restore the original selected vector
vrg.selected = selectedBackup;
vrg.size = sizeBackup;
vrg.selectedInUse = selectedInUseBackup;
}
static public String getOperatorName() {
return "FIL";
}
public VectorExpression getPredicateExpression() {
return predicateExpression;
}
@Override
public VectorDesc getVectorDesc() {
return vectorDesc;
}
}