Package org.apache.druid.segment

Class Metadata

java.lang.Object

org.apache.druid.segment.Metadata

public class Metadata
extends Object

Constructor Summary

Constructors

Constructor	Description
Metadata(Map<String,Object> container, AggregatorFactory[] aggregators, TimestampSpec timestampSpec, Granularity queryGranularity, Boolean rollup, List<OrderBy> ordering, List<AggregateProjectionMetadata> projections)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
AggregatorFactory[]	getAggregators()
Map<String,Object>	getContainer()
List<OrderBy>	getOrdering()	Ordering for the segment associated with this object.
List<AggregateProjectionMetadata>	getProjections()
Granularity	getQueryGranularity()
TimestampSpec	getTimestampSpec()
int	hashCode()
Boolean	isRollup()
static Metadata	merge(List<Metadata> toBeMerged, AggregatorFactory[] overrideMergedAggregators)
static List<OrderBy>	mergeOrderings(List<List<OrderBy>> orderingsToMerge)	Merge getOrdering() from different metadatas.
Metadata	putAll(Map<String,Object> other)
String	toString()
static void	validateProjections(List<List<AggregateProjectionMetadata>> projectionsToMerge)
Metadata	withDimensionOrder(List<OrderBy> ordering)
Metadata	withProjections(List<AggregateProjectionMetadata> projections)

Methods inherited from class java.lang.Object

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

Constructor Details

Metadata

public Metadata(@Nullable
 Map<String,Object> container,
 @Nullable
 AggregatorFactory[] aggregators,
 @Nullable
 TimestampSpec timestampSpec,
 @Nullable
 Granularity queryGranularity,
 @Nullable
 Boolean rollup,
 @Nullable
 List<OrderBy> ordering,
 @Nullable
 List<AggregateProjectionMetadata> projections)

Method Details

getContainer

public Map<String,Object> getContainer()

getAggregators

@Nullable
public AggregatorFactory[] getAggregators()

getTimestampSpec

@Nullable
public TimestampSpec getTimestampSpec()

getQueryGranularity

@Nullable
public Granularity getQueryGranularity()

isRollup

@Nullable
public Boolean isRollup()

getOrdering

@Nullable
public List<OrderBy> getOrdering()

Ordering for the segment associated with this object. Nonnull for segments written in current versions of Druid, but would null for older segments. Null may be interpreted as Cursors.ascendingTimeOrder(), since prior to this field being added, segments were always time-ordered. When dealing with QueryableIndex, it is generally better to use QueryableIndex.getOrdering(), since that method never returns null.

getProjections

@Nullable
public List<AggregateProjectionMetadata> getProjections()

withDimensionOrder

public Metadata withDimensionOrder(List<OrderBy> ordering)

withProjections

public Metadata withProjections(List<AggregateProjectionMetadata> projections)

putAll

public Metadata putAll(@Nullable
 Map<String,Object> other)

merge

@Nullable
public static Metadata merge(@Nullable
 List<Metadata> toBeMerged,
 @Nullable
 AggregatorFactory[] overrideMergedAggregators)

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

mergeOrderings

public static List<OrderBy> mergeOrderings(List<List<OrderBy>> orderingsToMerge)

Merge getOrdering() from different metadatas. When an input sort order is null, we assume it is Cursors.ascendingTimeOrder(), as this was the only sort order possible prior to the introduction of the "ordering" field.

validateProjections

public static void validateProjections(List<List<AggregateProjectionMetadata>> projectionsToMerge)