Package org.apache.drill.exec.record

Class VectorInitializer

java.lang.Object

org.apache.drill.exec.record.VectorInitializer

public class VectorInitializer
extends Object

Prototype mechanism to allocate vectors based on expected data sizes. This version uses a name-based map of fields to sizes. Better to represent the batch structurally and simply iterate over the schema rather than doing a per-field lookup. But, the mechanisms needed to do the efficient solution don't exist yet.

The element count is a float because it might be fractional. If every tenth array has an element, then the count per array is 0.1.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	VectorInitializer.AllocationHint

Constructor Summary

Constructors

Constructor	Description
VectorInitializer()

Method Summary

Modifier and Type	Method	Description
void	allocateBatch(VectorAccessible va, int recordCount)
void	allocateVector(ValueVector vector, int recordCount, VectorInitializer.AllocationHint hint)
void	allocateVector(ValueVector vector, String prefix, int recordCount)
void	allocateVectors(List<ValueVector> valueVectors, int recordCount)
void	fixedWidthArray(String name, float elements)
VectorInitializer.AllocationHint	hint(String name)
String	toString()
void	variableWidth(String name, int width)
void	variableWidthArray(String name, float width, float elements)

Methods inherited from class java.lang.Object

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

Constructor Details

VectorInitializer

public VectorInitializer()

Method Details

variableWidth

public void variableWidth(String name,
 int width)

fixedWidthArray

public void fixedWidthArray(String name,
 float elements)

variableWidthArray

public void variableWidthArray(String name,
 float width,
 float elements)

hint

public VectorInitializer.AllocationHint hint(String name)

allocateBatch

public void allocateBatch(VectorAccessible va,
 int recordCount)

allocateVectors

public void allocateVectors(List<ValueVector> valueVectors,
 int recordCount)

allocateVector

public void allocateVector(ValueVector vector,
 String prefix,
 int recordCount)

allocateVector

public void allocateVector(ValueVector vector,
 int recordCount,
 VectorInitializer.AllocationHint hint)

toString

public String toString()

Overrides:

toString in class Object