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

Class VoidColumnVector

java.lang.Object

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

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

public class VoidColumnVector
extends ColumnVector

This class represents a void (or no) type column vector. No value vector(s) needed. Always a NULL.

Nested Class Summary

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

ColumnVector.Type

Field Summary

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

isNull, isRepeating, noNulls, type

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	copySelected(boolean selectedInUse, int[] sel, int size, ColumnVector outputColVector)
void	flatten(boolean selectedInUse, int[] sel, int size)
void	setElement(int outputElementNum, int inputElementNum, ColumnVector inputColVector) 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.

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

ensureSize, flattenNoNulls, flattenPush, flattenRepeatingNulls, init, reset, setRepeating, shallowCopyTo, unFlatten

Methods inherited from class java.lang.Object

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

Constructor Detail

VoidColumnVector

public VoidColumnVector()

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

VoidColumnVector

public VoidColumnVector(int len)

Don't use this except for testing purposes.

Parameters:

len -

Method Detail

flatten

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

Specified by:

flatten in class ColumnVector

setElement

public void setElement(int outputElementNum,
                       int inputElementNum,
                       ColumnVector inputColVector)

Description copied from class: ColumnVector

Set the element in this column vector from the given input vector. The inputElementNum will be adjusted to 0 if the input column has isRepeating set. On the other hand, the outElementNum must have been adjusted to 0 in ADVANCE when the output has isRepeating set. IMPORTANT: if the output entry is marked as NULL, this method will do NOTHING. This supports the caller to do output NULL processing in advance that may cause the output results operation to be ignored. Thus, make sure the output isNull entry is set in ADVANCE. The inputColVector noNulls and isNull entry will be examined. The output will only be set if the input is NOT NULL. I.e. noNulls || !isNull[inputElementNum] where inputElementNum may have been adjusted to 0 for isRepeating. If the input entry is NULL or out-of-range, the output will be marked as NULL. I.e. set output noNull = false and isNull[outElementNum] = true. An example of out-of-range is the DecimalColumnVector which can find the input decimal does not fit in the output precision/scale. (Since we return immediately if the output entry is NULL, we have no need and do not mark the output entry to NOT NULL).

Specified by:

setElement in class ColumnVector

copySelected

public void copySelected(boolean selectedInUse,
                         int[] sel,
                         int size,
                         ColumnVector outputColVector)

Specified by:

copySelected 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