org.apache.hadoop.hive.ql.exec.vector.expressions.gen.CastLongToDouble Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.hadoop.hive.ql.exec.vector.expressions.gen;
import java.util.Arrays;
import org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression;
import org.apache.hadoop.hive.ql.exec.vector.expressions.MathExpr;
import org.apache.hadoop.hive.ql.exec.vector.*;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
import org.apache.hadoop.hive.ql.exec.vector.VectorExpressionDescriptor;
import org.apache.hadoop.hive.ql.metadata.HiveException;
public class CastLongToDouble extends VectorExpression {
private static final long serialVersionUID = 1L;
private final int colNum;
public CastLongToDouble(int colNum, int outputColumnNum) {
super(outputColumnNum);
this.colNum = colNum;
}
public CastLongToDouble() {
super();
// Dummy final assignments.
colNum = -1;
}
@Override
public void evaluate(VectorizedRowBatch batch) throws HiveException {
// return immediately if batch is empty
final int n = batch.size;
if (n == 0) {
return;
}
if (childExpressions != null) {
this.evaluateChildren(batch);
}
LongColumnVector inputColVector = (LongColumnVector) batch.cols[colNum];
DoubleColumnVector outputColVector = (DoubleColumnVector) batch.cols[outputColumnNum];
int[] sel = batch.selected;
boolean[] inputIsNull = inputColVector.isNull;
boolean[] outputIsNull = outputColVector.isNull;
long[] vector = inputColVector.vector;
double[] outputVector = outputColVector.vector;
// We do not need to do a column reset since we are carefully changing the output.
outputColVector.isRepeating = false;
if (inputColVector.isRepeating) {
if (inputColVector.noNulls || !inputIsNull[0]) {
outputIsNull[0] = false;
outputVector[0] = (double) ( vector[0]);
} else {
outputIsNull[0] = true;
outputColVector.noNulls = false;
}
outputColVector.isRepeating = true;
return;
}
if (inputColVector.noNulls) {
if (batch.selectedInUse) {
// CONSIDER: For large n, fill n or all of isNull array and use the tighter ELSE loop.
if (!outputColVector.noNulls) {
for(int j = 0; j != n; j++) {
final int i = sel[j];
outputIsNull[i] = false;
outputVector[i] = (double) ( vector[i]);
}
} else {
for(int j = 0; j != n; j++) {
final int i = sel[j];
outputVector[i] = (double) ( vector[i]);
}
}
} else {
if (!outputColVector.noNulls) {
// Assume it is almost always a performance win to fill all of isNull so we can
// safely reset noNulls.
Arrays.fill(outputIsNull, false);
outputColVector.noNulls = true;
}
for(int i = 0; i != n; i++) {
outputVector[i] = (double) ( vector[i]);
}
}
} else /* there are NULLs in the inputColVector */ {
// Carefully handle NULLs...
/*
* For better performance on LONG/DOUBLE we don't want the conditional
* statements inside the for loop.
*/
outputColVector.noNulls = false;
if (batch.selectedInUse) {
for(int j=0; j != n; j++) {
int i = sel[j];
outputIsNull[i] = inputIsNull[i];
outputVector[i] = (double) ( vector[i]);
}
} else {
System.arraycopy(inputIsNull, 0, outputIsNull, 0, n);
for(int i = 0; i != n; i++) {
outputVector[i] = (double) ( vector[i]);
}
}
}
}
@Override
public String vectorExpressionParameters() {
return getColumnParamString(0, colNum);
}
@Override
public VectorExpressionDescriptor.Descriptor getDescriptor() {
return (new VectorExpressionDescriptor.Builder())
.setMode(
VectorExpressionDescriptor.Mode.PROJECTION)
.setNumArguments(1)
.setArgumentTypes(
VectorExpressionDescriptor.ArgumentType.getType("long"))
.setInputExpressionTypes(
VectorExpressionDescriptor.InputExpressionType.COLUMN).build();
}
}