org.apache.flink.optimizer.dataproperties

Class LocalProperties

java.lang.Object

org.apache.flink.optimizer.dataproperties.LocalProperties

All Implemented Interfaces:

Cloneable

public class LocalProperties
extends Object
implements Cloneable

This class represents local properties of the data. A local property is a property that exists within the data of a single partition, such as sort order, or data grouping.

Field Summary

Fields

Modifier and Type	Field and Description
static LocalProperties	EMPTY
static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor and Description
LocalProperties() Default constructor for trivial local properties.

Method Summary

Modifier and Type	Method and Description
LocalProperties	addUniqueFields(FieldSet uniqueFields) Adds a combination of fields that are unique in these data properties.
boolean	areFieldsUnique(FieldSet set) Checks whether the given set of fields is unique, as specified in these local properties.
LocalProperties	clearUniqueFieldSets()
LocalProperties	clone()
static LocalProperties	combine(LocalProperties lp1, LocalProperties lp2)
boolean	equals(Object obj)
LocalProperties	filterBySemanticProperties(SemanticProperties props, int input) Filters these LocalProperties by the fields that are forwarded to the output as described by the SemanticProperties.
static LocalProperties	forGrouping(FieldList groupedFields)
static LocalProperties	forOrdering(Ordering o)
FieldList	getGroupedFields() Gets the grouped fields.
Ordering	getOrdering() Gets the key order.
Set<FieldSet>	getUniqueFields() Gets the fields whose combination is unique within the data set.
int	hashCode()
boolean	isTrivial() Checks, if the properties in this object are trivial, i.e. only standard values.
String	toString()

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

LOG

public static final org.slf4j.Logger LOG

EMPTY

public static final LocalProperties EMPTY

Constructor Detail

LocalProperties

public LocalProperties()

Default constructor for trivial local properties. No order, no grouping, no uniqueness.

Method Detail

getOrdering

public Ordering getOrdering()

Gets the key order.

Returns:

The key order, or null if nothing is ordered.

getGroupedFields

public FieldList getGroupedFields()

Gets the grouped fields.

Returns:

The grouped fields, or null if nothing is grouped.

getUniqueFields

public Set<FieldSet> getUniqueFields()

Gets the fields whose combination is unique within the data set.

Returns:

The unique field combination, or null if nothing is unique.

areFieldsUnique

public boolean areFieldsUnique(FieldSet set)

Checks whether the given set of fields is unique, as specified in these local properties.

Parameters:

set - The set to check.

Returns:

True, if the given column combination is unique, false if not.

addUniqueFields

public LocalProperties addUniqueFields(FieldSet uniqueFields)

Adds a combination of fields that are unique in these data properties.

Parameters:

uniqueFields - The fields that are unique in these data properties.

clearUniqueFieldSets

public LocalProperties clearUniqueFieldSets()

isTrivial

public boolean isTrivial()

Checks, if the properties in this object are trivial, i.e. only standard values.

filterBySemanticProperties

public LocalProperties filterBySemanticProperties(SemanticProperties props,
                                                  int input)

Filters these LocalProperties by the fields that are forwarded to the output as described by the SemanticProperties.

Parameters:

props - The semantic properties holding information about forwarded fields.

input - The index of the input.

Returns:

The filtered LocalProperties

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

clone

public LocalProperties clone()

Overrides:

clone in class Object

combine

public static LocalProperties combine(LocalProperties lp1,
                                      LocalProperties lp2)

forOrdering

public static LocalProperties forOrdering(Ordering o)

forGrouping

public static LocalProperties forGrouping(FieldList groupedFields)