Package org.apache.arrow.vector.table

Class Table

java.lang.Object

org.apache.arrow.vector.table.BaseTable

org.apache.arrow.vector.table.Table

All Implemented Interfaces:

AutoCloseable, Iterable<Row>

public class Table
extends BaseTable
implements Iterable<Row>

Table is an immutable tabular data structure.

See VectorSchemaRoot for batch processing use cases

This API is EXPERIMENTAL.

Field Summary

Fields inherited from class org.apache.arrow.vector.table.BaseTable

dictionaryProvider, fieldVectors, fieldVectorsMap, rowCount, schema

Constructor Summary

Constructors

Constructor	Description
Table(Iterable<FieldVector> vectors)	Constructs new instance containing each of the given vectors.
Table(List<FieldVector> fieldVectors)	Constructs a new instance with the number of rows set to the value count of the first FieldVector.
Table(List<FieldVector> fieldVectors, int rowCount)	Constructs a new instance.
Table(List<FieldVector> fieldVectors, int rowCount, DictionaryProvider provider)	Constructs a new instance.
Table(VectorSchemaRoot vsr)	Constructs a new instance containing the data from the argument.

Method Summary

Modifier and Type	Method	Description
Table	addVector(int index, FieldVector vector)	Returns a new Table created by adding the given vector to the vectors in this Table.
Table	copy()	Returns a deep copy of this table.
Iterator<Row>	iterator()	Returns a Row iterator for this Table.
static Table	of(FieldVector... vectors)	Constructs a new instance from vectors.
Table	removeVector(int index)	Returns a new Table created by removing the selected Vector from this Table.
Table	slice(int index)	Slice this table from desired index.
Table	slice(int index, int length)	Slice this table at desired index and length.

Methods inherited from class org.apache.arrow.vector.table.BaseTable

close, contentToTSVString, decode, encode, getDictionaryProvider, getField, getReader, getReader, getReader, getRowCount, getSchema, getVectorCopy, getVectorCopy, getVectorCount, immutableRow, isRowDeleted, toVectorSchemaRoot

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Details

Table

public Table(Iterable<FieldVector> vectors)

Constructs new instance containing each of the given vectors.

Table

public Table(List<FieldVector> fieldVectors)

Constructs a new instance with the number of rows set to the value count of the first FieldVector.

All vectors must have the same value count. Although this is not checked, inconsistent counts may lead to exceptions or other undefined behavior later.

Parameters:

fieldVectors - The data vectors (must be equal in size to fields.

Table

public Table(List<FieldVector> fieldVectors,
 int rowCount)

Constructs a new instance.

Parameters:

fieldVectors - The data vectors.

rowCount - The number of rows

Table

public Table(List<FieldVector> fieldVectors,
 int rowCount,
 DictionaryProvider provider)

Constructs a new instance.

Parameters:

fieldVectors - The data vectors.

rowCount - The number of rows

provider - A dictionary provider. May be null if none of the vectors is dictionary encoded

Table

public Table(VectorSchemaRoot vsr)

Constructs a new instance containing the data from the argument. Vectors are shared between the Table and VectorSchemaRoot. Direct modification of those vectors is unsafe and should be avoided.

Parameters:

vsr - The VectorSchemaRoot providing data for this Table

Method Details

of

public static Table of(FieldVector... vectors)

Constructs a new instance from vectors.

copy

public Table copy()

Returns a deep copy of this table.

addVector

public Table addVector(int index,
 FieldVector vector)

Returns a new Table created by adding the given vector to the vectors in this Table.

Parameters:

index - field index

vector - vector to be added.

Returns:

out a new Table with vector added

removeVector

public Table removeVector(int index)

Returns a new Table created by removing the selected Vector from this Table.

Parameters:

index - field index

Returns:

out a new Table with vector removed

slice

public Table slice(int index)

Slice this table from desired index. Memory is NOT transferred from the vectors in this table to new vectors in the target table. This table is unchanged.

Parameters:

index - start position of the slice

Returns:

the sliced table

slice

public Table slice(int index,
 int length)

Slice this table at desired index and length. Memory is NOT transferred from the vectors in this table to new vectors in the target table. This table is unchanged.

Parameters:

index - start position of the slice

length - length of the slice

Returns:

the sliced table

iterator

public Iterator<Row> iterator()

Returns a Row iterator for this Table.

Specified by:

iterator in interface Iterable<Row>