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

Class MultiValuedColumnVector

java.lang.Object

org.apache.hadoop.hive.ql.exec.vector.ColumnVector

org.apache.hadoop.hive.ql.exec.vector.MultiValuedColumnVector

Direct Known Subclasses:

ListColumnVector, MapColumnVector

public abstract class MultiValuedColumnVector
extends ColumnVector

The representation of a vectorized column of multi-valued objects, such as lists and maps. Each object is composed of a range of elements in the underlying child ColumnVector. The range for list i is offsets[i]..offsets[i]+lengths[i]-1 inclusive.

Nested Class Summary

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

ColumnVector.Type

Field Summary

Fields

Modifier and Type	Field and Description
int	childCount
long[]	lengths
long[]	offsets

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

isNull, isRepeating, noNulls

Constructor Summary

Constructors

Constructor and Description
MultiValuedColumnVector(int len) Constructor for MultiValuedColumnVector.

Method Summary

Modifier and Type	Method and Description
protected abstract void	childFlatten(boolean useSelected, int[] selected, int size)
void	ensureSize(int size, boolean preserveData) Ensure the ColumnVector can hold at least size values.
void	flatten(boolean selectedInUse, int[] sel, int size)
void	init() Initializee the vector
void	reset() Reset the vector for the next batch.

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

flattenNoNulls, flattenPush, flattenRepeatingNulls, setElement, setRepeating, stringifyValue, unFlatten

Methods inherited from class java.lang.Object

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

Field Detail

offsets

public long[] offsets

lengths

public long[] lengths

childCount

public int childCount

Constructor Detail

MultiValuedColumnVector

public MultiValuedColumnVector(int len)

Constructor for MultiValuedColumnVector.

Parameters:

len - Vector length

Method Detail

childFlatten

protected abstract void childFlatten(boolean useSelected,
                                     int[] selected,
                                     int size)

flatten

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

Specified by:

flatten in class ColumnVector

ensureSize

public void ensureSize(int size,
                       boolean preserveData)

Description copied from class: ColumnVector

Ensure the ColumnVector can hold at least size values. This method is deliberately *not* recursive because the complex types can easily have more (or less) children than the upper levels.

Overrides:

ensureSize in class ColumnVector

Parameters:

size - the new minimum size

preserveData - should the old data be preserved?

init

public void init()

Initializee the vector

Overrides:

init in class ColumnVector

reset

public void reset()

Reset the vector for the next batch.

Overrides:

reset in class ColumnVector