org.apache.hadoop.hive.ql.exec.vector
Class DoubleColumnVector

java.lang.Object
  org.apache.hadoop.hive.ql.exec.vector.ColumnVector
      org.apache.hadoop.hive.ql.exec.vector.DoubleColumnVector

public class DoubleColumnVector
extends ColumnVector

This class represents a nullable double precision floating point column vector. This class will be used for operations on all floating point types (float, double) and as such will use a 64-bit double value to hold the biggest possible value. During copy-in/copy-out, smaller types (i.e. float) will be converted as needed. This will reduce the amount of code that needs to be generated and also will run fast since the machine operates with 64-bit words. The vector[] field is public by design for high-performance access in the inner loop of query execution.

Field Summary

static double	NULL_VALUE
double[]	vector

Fields inherited from class org.apache.hadoop.hive.ql.exec.vector.ColumnVector

isNull, isRepeating, noNulls

Constructor Summary

DoubleColumnVector()
Use this constructor by default.

DoubleColumnVector(int len)
Don't use this except for testing purposes.

Method Summary

void	copySelected(boolean selectedInUse, int[] sel, int size, DoubleColumnVector output)
void	fill(double value)
void	flatten(boolean selectedInUse, int[] sel, int size)
org.apache.hadoop.io.Writable	getWritableObject(int index)
void	setElement(int outElementNum, int inputElementNum, ColumnVector inputVector) Set the element in this column vector from the given input vector.

Methods inherited from class org.apache.hadoop.hive.ql.exec.vector.ColumnVector

flattenNoNulls, flattenRepeatingNulls, init, reset, unFlatten

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

vector

public double[] vector

NULL_VALUE

public static final double NULL_VALUE

See Also:

Constant Field Values

Constructor Detail

DoubleColumnVector

public DoubleColumnVector()

Use this constructor by default. All column vectors should normally be the default size.

DoubleColumnVector

public DoubleColumnVector(int len)

Don't use this except for testing purposes.

Parameters:

len -

Method Detail

getWritableObject

public org.apache.hadoop.io.Writable getWritableObject(int index)

Specified by:

getWritableObject in class ColumnVector

copySelected

public void copySelected(boolean selectedInUse,
                         int[] sel,
                         int size,
                         DoubleColumnVector output)

fill

public void fill(double value)

flatten

public void flatten(boolean selectedInUse,
                    int[] sel,
                    int size)

Specified by:

flatten in class ColumnVector

setElement

public void setElement(int outElementNum,
                       int inputElementNum,
                       ColumnVector inputVector)

Description copied from class: ColumnVector

Set the element in this column vector from the given input vector.

Specified by:

setElement in class ColumnVector