Package org.apache.gravitino.dto.rel.partitioning

Class BucketPartitioningDTO

java.lang.Object

org.apache.gravitino.dto.rel.partitioning.BucketPartitioningDTO

All Implemented Interfaces:

Partitioning, Expression, Transform

public final class BucketPartitioningDTO
extends Object
implements Partitioning

Data transfer object representing bucket partitioning.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.gravitino.dto.rel.partitioning.Partitioning

Partitioning.SingleFieldPartitioning, Partitioning.Strategy

Nested classes/interfaces inherited from interface org.apache.gravitino.rel.expressions.transforms.Transform

Transform.SingleFieldTransform

Field Summary

Fields inherited from interface org.apache.gravitino.rel.expressions.Expression

EMPTY_EXPRESSION, EMPTY_NAMED_REFERENCE

Fields inherited from interface org.apache.gravitino.dto.rel.partitioning.Partitioning

EMPTY_PARTITIONING

Method Summary

Modifier and Type	Method	Description
Expression[]	arguments()
String[][]	fieldNames()	Returns the field names.
String	name()
int	numBuckets()	Returns the number of buckets.
static BucketPartitioningDTO	of(int numBuckets, String[]... fieldNames)	Creates a new instance of BucketPartitioningDTO.
Partitioning.Strategy	strategy()	Returns the name of the partitioning strategy.
void	validate(ColumnDTO[] columns)	Validates the partitioning columns.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.gravitino.rel.expressions.Expression

references

Methods inherited from interface org.apache.gravitino.rel.expressions.transforms.Transform

assignments, children

Method Details

of

public static BucketPartitioningDTO of(int numBuckets,
 String[]... fieldNames)

Creates a new instance of BucketPartitioningDTO.

Parameters:

numBuckets - The number of buckets.

fieldNames - The field names.

Returns:

The new instance.

numBuckets

public int numBuckets()

Returns the number of buckets.

Returns:

The number of buckets.

fieldNames

public String[][] fieldNames()

Returns the field names.

Returns:

The field names.

strategy

public Partitioning.Strategy strategy()

Description copied from interface: Partitioning

Returns the name of the partitioning strategy.

Specified by:

strategy in interface Partitioning

Returns:

The strategy of the partitioning.

validate

public void validate(ColumnDTO[] columns)
              throws IllegalArgumentException

Validates the partitioning columns.

Specified by:

validate in interface Partitioning

Parameters:

columns - The columns to be validated.

Throws:

IllegalArgumentException - If the columns are invalid, this exception is thrown.

name

public String name()

Specified by:

name in interface Transform

Returns:

The name of the partitioning strategy.

arguments

public Expression[] arguments()

Specified by:

arguments in interface Transform

Returns:

The arguments of the partitioning strategy.