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

Class DecimalColumnVector

java.lang.Object

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

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

public class DecimalColumnVector
extends ColumnVector

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
short	precision
short	scale
HiveDecimalWritable[]	vector A vector of HiveDecimalWritable objects.

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

isNull, isRepeating, noNulls, type

Constructor Summary

Constructors

Constructor and Description
DecimalColumnVector(int precision, int scale)
DecimalColumnVector(int size, int precision, int scale)

Method Summary

Modifier and Type	Method and Description
void	copySelected(boolean selectedInUse, int[] sel, int size, ColumnVector outputColVector)
void	ensureSize(int size, boolean preserveData) Ensure the ColumnVector can hold at least size values.
void	fill(HiveDecimal value)
void	flatten(boolean selectedInUse, int[] sel, int size)
void	set(int elementNum, HiveDecimal hiveDec) Set a decimal from a HiveDecimal.
void	set(int elementNum, HiveDecimalWritable writable) Set a Decimal64 field from a HiveDecimalWritable.
void	setElement(int outputElementNum, int inputElementNum, ColumnVector inputColVector) Set the element in this column vector from the given input vector.
void	setNullDataValue(int elementNum)
void	shallowCopyTo(ColumnVector otherCv) Shallow copy of the contents of this vector to the other vector; replaces other vector's values.
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

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

Methods inherited from class java.lang.Object

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

Field Detail

vector

public HiveDecimalWritable[] vector

A vector of HiveDecimalWritable objects. For high performance and easy access to this low-level structure, the fields are public by design (as they are in other ColumnVector types).

scale

public short scale

precision

public short precision

Constructor Detail

DecimalColumnVector

public DecimalColumnVector(int precision,
                           int scale)

DecimalColumnVector

public DecimalColumnVector(int size,
                           int precision,
                           int scale)

Method Detail

fill

public void fill(HiveDecimal value)

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)

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

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

set

public void set(int elementNum,
                HiveDecimalWritable writable)

Set a Decimal64 field from a HiveDecimalWritable. This is a FAST version that assumes the caller has checked to make sure the writable is not null and elementNum is correctly adjusted for isRepeating. And, that the isNull entry has been set. We will check for precision/scale range, so the entry's NULL may get set. Otherwise, only the output entry fields will be set by this method.

Parameters:

elementNum -

writable -

set

public void set(int elementNum,
                HiveDecimal hiveDec)

Set a decimal from a HiveDecimal. This is a FAST version that assumes the caller has checked to make sure the hiveDec is not null and elementNum is correctly adjusted for isRepeating. And, that the isNull entry has been set. We will check for precision/scale range, so the entry's NULL may get set. Otherwise, only the output entry fields will be set by this method.

Parameters:

elementNum -

hiveDec -

setNullDataValue

public void setNullDataValue(int elementNum)

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?

shallowCopyTo

public void shallowCopyTo(ColumnVector otherCv)

Description copied from class: ColumnVector

Shallow copy of the contents of this vector to the other vector; replaces other vector's values.

Overrides:

shallowCopyTo in class ColumnVector

copySelected

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

Specified by:

copySelected in class ColumnVector