org.apache.hadoop.hive.ql.exec.vector.expressions.gen.IfExprDoubleScalarDoubleColumn Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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package org.apache.hadoop.hive.ql.exec.vector.expressions.gen;
import org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression;
import org.apache.hadoop.hive.ql.exec.vector.LongColumnVector;
import org.apache.hadoop.hive.ql.exec.vector.DoubleColumnVector;
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;
/**
* Compute IF(expr1, expr2, expr3) for 3 input column expressions.
* The first is always a boolean (LongColumnVector).
* The second is a column or non-constant expression result.
* The third is a constant value.
*/
public class IfExprDoubleScalarDoubleColumn extends VectorExpression {
private static final long serialVersionUID = 1L;
private final int arg1Column;
private final double arg2Scalar;
private final int arg3Column;
public IfExprDoubleScalarDoubleColumn(int arg1Column, double arg2Scalar, int arg3Column,
int outputColumnNum) {
super(outputColumnNum);
this.arg1Column = arg1Column;
this.arg2Scalar = arg2Scalar;
this.arg3Column = arg3Column;
}
public IfExprDoubleScalarDoubleColumn() {
super();
// Dummy final assignments.
arg1Column = -1;
arg2Scalar = 0;
arg3Column = -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) {
super.evaluateChildren(batch);
}
LongColumnVector arg1ColVector = (LongColumnVector) batch.cols[arg1Column];
DoubleColumnVector arg3ColVector = (DoubleColumnVector) batch.cols[arg3Column];
DoubleColumnVector outputColVector = (DoubleColumnVector) batch.cols[outputColumnNum];
int[] sel = batch.selected;
boolean[] outputIsNull = outputColVector.isNull;
// We do not need to do a column reset since we are carefully changing the output.
outputColVector.isRepeating = false;
long[] vector1 = arg1ColVector.vector;
double[] vector3 = arg3ColVector.vector;
double[] outputVector = outputColVector.vector;
if (arg1ColVector.isRepeating) {
if ((arg1ColVector.noNulls || !arg1ColVector.isNull[0]) && vector1[0] == 1) {
outputColVector.fill(arg2Scalar);
} else {
arg3ColVector.copySelected(batch.selectedInUse, sel, n, outputColVector);
}
return;
}
// Extend any repeating values and noNulls indicator in the inputs to
// reduce the number of code paths needed below.
// This could be optimized in the future by having separate paths
// for when arg3ColVector is repeating or has no nulls.
arg3ColVector.flatten(batch.selectedInUse, sel, n);
/*
* Do careful maintenance of NULLs.
*/
outputColVector.noNulls = false;
if (arg1ColVector.noNulls) {
if (batch.selectedInUse) {
for(int j = 0; j != n; j++) {
int i = sel[j];
outputVector[i] = (vector1[i] == 1 ? arg2Scalar : vector3[i]);
outputIsNull[i] = (vector1[i] == 1 ? false : arg3ColVector.isNull[i]);
}
} else {
for(int i = 0; i != n; i++) {
outputVector[i] = (vector1[i] == 1 ? arg2Scalar : vector3[i]);
outputIsNull[i] = (vector1[i] == 1 ? false : arg3ColVector.isNull[i]);
}
}
} else /* there are NULLs in the inputColVector */ {
if (batch.selectedInUse) {
for(int j = 0; j != n; j++) {
int i = sel[j];
outputVector[i] = (!arg1ColVector.isNull[i] && vector1[i] == 1 ?
arg2Scalar : vector3[i]);
outputIsNull[i] = (!arg1ColVector.isNull[i] && vector1[i] == 1 ?
false : arg3ColVector.isNull[i]);
}
} else {
for(int i = 0; i != n; i++) {
outputVector[i] = (!arg1ColVector.isNull[i] && vector1[i] == 1 ?
arg2Scalar : vector3[i]);
outputIsNull[i] = (!arg1ColVector.isNull[i] && vector1[i] == 1 ?
false : arg3ColVector.isNull[i]);
}
}
}
// restore repeating and no nulls indicators
arg3ColVector.unFlatten();
}
@Override
public String vectorExpressionParameters() {
return getColumnParamString(0, arg1Column) + ", val "+ arg2Scalar + ", " +
getColumnParamString(2, arg3Column);
}
@Override
public VectorExpressionDescriptor.Descriptor getDescriptor() {
return (new VectorExpressionDescriptor.Builder())
.setMode(
VectorExpressionDescriptor.Mode.PROJECTION)
.setNumArguments(3)
.setArgumentTypes(
VectorExpressionDescriptor.ArgumentType.getType("long"),
VectorExpressionDescriptor.ArgumentType.getType("double"),
VectorExpressionDescriptor.ArgumentType.getType("double"))
.setInputExpressionTypes(
VectorExpressionDescriptor.InputExpressionType.COLUMN,
VectorExpressionDescriptor.InputExpressionType.SCALAR,
VectorExpressionDescriptor.InputExpressionType.COLUMN).build();
}
}