DoubleColumnVector (Hive 1.2.2 API)

```
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.

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.exec.vector.ColumnVector
  ColumnVector.Type

Fields
Modifier and Type	Field and Description
`static double`	`NULL_VALUE`
`double[]`	`vector`

Constructors
Constructor and Description
`DoubleColumnVector()` Use this constructor by default.
`DoubleColumnVector(int len)` Don't use this except for testing purposes.

Methods
Modifier and Type	Method and Description
`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, flattenPush, flattenRepeatingNulls, init, reset, unFlatten

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

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

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

Class DoubleColumnVector