Package org.apache.arrow.vector.util

Class ValueVectorUtility

java.lang.Object

org.apache.arrow.vector.util.ValueVectorUtility

public class ValueVectorUtility
extends Object

Utility methods for ValueVector.

Method Summary

Modifier and Type	Method	Description
static void	ensureCapacity(VectorSchemaRoot root, int targetCapacity)	Ensure capacity for BaseFixedWidthVector.
static <V extends ValueVector> String	getToString(V vector, int start, int end)	Get the toString() representation of vector suitable for debugging.
static <V extends ValueVector> String	getToString(V vector, int start, int end, BiFunction<V,Integer,Object> valueToString)	Get the toString() representation of vector suitable for debugging.
static void	preAllocate(VectorSchemaRoot root, int targetSize)	Pre allocate memory for BaseFixedWidthVector.
static void	validate(ValueVector vector)	Utility to validate vector in O(1) time.
static void	validate(VectorSchemaRoot root)	Utility to validate vector schema root in O(1) time.
static void	validateFull(ValueVector vector)	Utility to validate vector in O(n) time, where n is the value count.
static void	validateFull(VectorSchemaRoot root)	Utility to validate vector in O(n) time, where n is the value count.

Methods inherited from class java.lang.Object

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

Method Details

getToString

public static <V extends ValueVector> String getToString(V vector,
 int start,
 int end)

Get the toString() representation of vector suitable for debugging. Note since vectors may have millions of values, this method only shows max 20 values. Examples as below (v represents value):

vector with 0 value: []

vector with 5 values (no more than 20 values): [v0, v1, v2, v3, v4]

vector with 100 values (more than 20 values): [v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, ..., v90, v91, v92, v93, v94, v95, v96, v97, v98, v99]

getToString

public static <V extends ValueVector> String getToString(V vector,
 int start,
 int end,
 BiFunction<V,Integer,Object> valueToString)

Get the toString() representation of vector suitable for debugging. Note since vectors may have millions of values, this method only shows at most 20 values.

Parameters:

vector - the vector for which to get toString representation.

start - the starting index, inclusive.

end - the end index, exclusive.

valueToString - the function to transform individual elements to strings.

validate

public static void validate(ValueVector vector)

Utility to validate vector in O(1) time.

validateFull

public static void validateFull(ValueVector vector)

Utility to validate vector in O(n) time, where n is the value count.

validate

public static void validate(VectorSchemaRoot root)

Utility to validate vector schema root in O(1) time.

validateFull

public static void validateFull(VectorSchemaRoot root)

Utility to validate vector in O(n) time, where n is the value count.

preAllocate

public static void preAllocate(VectorSchemaRoot root,
 int targetSize)

Pre allocate memory for BaseFixedWidthVector.

ensureCapacity

public static void ensureCapacity(VectorSchemaRoot root,
 int targetCapacity)

Ensure capacity for BaseFixedWidthVector.