org.apache.drill.exec.vector

Class AllocationHelper

java.lang.Object

org.apache.drill.exec.vector.AllocationHelper

public class AllocationHelper
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static int	STD_REPETITION_FACTOR

Constructor Summary

Constructors

Constructor and Description
AllocationHelper()

Method Summary

Modifier and Type	Method and Description
static void	allocate(ValueVector vector, int valueCount, int bytesPerValue)
static void	allocate(ValueVector vector, int valueCount, int bytesPerValue, float repeatedPerTop) Allocate an array, but with a fractional value for the number of elements per array.
static void	allocate(ValueVector vector, int valueCount, int bytesPerValue, int repeatedPerTop)
static void	allocateNew(ValueVector vector, int valueCount) Allocates the exact amount if v is fixed width, otherwise falls back to dynamic allocation
static void	allocatePrecomputedChildCount(ValueVector vector, int valueCount, int bytesPerValue, int childValCount)

Methods inherited from class java.lang.Object

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

Field Detail

STD_REPETITION_FACTOR

public static final int STD_REPETITION_FACTOR

See Also:

Constant Field Values

Constructor Detail

AllocationHelper

public AllocationHelper()

Method Detail

allocate

public static void allocate(ValueVector vector,
                            int valueCount,
                            int bytesPerValue)

allocatePrecomputedChildCount

public static void allocatePrecomputedChildCount(ValueVector vector,
                                                 int valueCount,
                                                 int bytesPerValue,
                                                 int childValCount)

allocate

public static void allocate(ValueVector vector,
                            int valueCount,
                            int bytesPerValue,
                            int repeatedPerTop)

allocate

public static void allocate(ValueVector vector,
                            int valueCount,
                            int bytesPerValue,
                            float repeatedPerTop)

Allocate an array, but with a fractional value for the number of elements per array. This form is useful when the number comes from observations and represents an average.

Parameters:

vector - the vector to allocate

valueCount - the number of top-level values

bytesPerValue - the width of each value

repeatedPerTop - the number of array elements per value.

allocateNew

public static void allocateNew(ValueVector vector,
                               int valueCount)

Allocates the exact amount if v is fixed width, otherwise falls back to dynamic allocation

Parameters:

vector - value vector we are trying to allocate

valueCount - size we are trying to allocate

Throws:

org.apache.drill.exec.memory.OutOfMemoryException - if it can't allocate the memory