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

Class MapColumnVector

java.lang.Object

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

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

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

public class MapColumnVector
extends MultiValuedColumnVector

The representation of a vectorized column of map objects. Each map is composed of a range of elements in the underlying child ColumnVector. The range for map 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
ColumnVector	keys
ColumnVector	values

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

childCount, lengths, offsets

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

isNull, isRepeating, noNulls

Constructor Summary

Constructors

Constructor and Description
MapColumnVector()
MapColumnVector(int len, ColumnVector keys, ColumnVector values) Constructor for MapColumnVector

Method Summary

Modifier and Type	Method and Description
protected void	childFlatten(boolean useSelected, int[] selected, int size)
void	init() Initializee the vector
void	reset() Reset the vector for the next batch.
void	setElement(int outElementNum, int inputElementNum, ColumnVector inputVector) Set the element in this column vector from the given input vector.
void	stringifyValue(StringBuilder buffer, int row) Print the value for this column into the given string builder.
void	unFlatten() Restore the state of isRepeating and noNulls to what it was before flattening.

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

ensureSize, flatten

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

flattenNoNulls, flattenPush, flattenRepeatingNulls, setRepeating

Methods inherited from class java.lang.Object

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

Field Detail

keys

public ColumnVector keys

values

public ColumnVector values

Constructor Detail

MapColumnVector

public MapColumnVector()

MapColumnVector

public MapColumnVector(int len,
                       ColumnVector keys,
                       ColumnVector values)

Constructor for MapColumnVector

Parameters:

len - Vector length

keys - The keys column vector

values - The values column vector

Method Detail

childFlatten

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

Specified by:

childFlatten in class MultiValuedColumnVector

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. This method can assume that the output does not have isRepeating set.

Specified by:

setElement in class ColumnVector

stringifyValue

public void stringifyValue(StringBuilder buffer,
                           int row)

Description copied from class: ColumnVector

Print the value for this column into the given string builder.

Specified by:

stringifyValue in class ColumnVector

Parameters:

buffer - the buffer to print into

row - the id of the row to print

init

public void init()

Description copied from class: MultiValuedColumnVector

Initializee the vector

Overrides:

init in class MultiValuedColumnVector

reset

public void reset()

Description copied from class: MultiValuedColumnVector

Reset the vector for the next batch.

Overrides:

reset in class MultiValuedColumnVector

unFlatten

public void unFlatten()

Description copied from class: ColumnVector

Restore the state of isRepeating and noNulls to what it was before flattening. This must only be called just after flattening and then evaluating a VectorExpression on the column vector. It is an optimization that allows other operations on the same column to continue to benefit from the isRepeating and noNulls indicators.

Overrides:

unFlatten in class ColumnVector