Package org.apache.druid.query.filter

Class FilterSegmentPruner

java.lang.Object

org.apache.druid.query.filter.FilterSegmentPruner

All Implemented Interfaces:

SegmentPruner

public class FilterSegmentPruner
extends Object
implements SegmentPruner

Uses a DimFilter to check the DimFilter.getDimensionRangeSet(String) against ShardSpec.possibleInDomain(Map) in order to 'prune' a set of segments whose rows would never match a filter and avoid processing those segments in the first place.

Constructor Summary

Constructors

Constructor	Description
FilterSegmentPruner(DimFilter filter, Set<String> filterFields, VirtualColumns virtualColumns)

Method Summary

Modifier and Type	Method	Description
SegmentPruner	combine(SegmentPruner other)
boolean	equals(Object o)
int	hashCode()
boolean	include(DataSegment segment)	Returns false if the DataSegment does not fit in DimFilter.getDimensionRangeSet(String).
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.query.filter.SegmentPruner

prune

Constructor Details

FilterSegmentPruner

public FilterSegmentPruner(DimFilter filter,
 @Nullable
 Set<String> filterFields,
 @Nullable
 VirtualColumns virtualColumns)

Method Details

include

public boolean include(DataSegment segment)

Returns false if the DataSegment does not fit in DimFilter.getDimensionRangeSet(String).

rangeCache stores the RangeSets of different dimensions for the filter, so it can be re-used between calls to save redundant evaluation of DimFilter.getDimensionRangeSet(String) on the same columns.

Specified by:

include in interface SegmentPruner

combine

public SegmentPruner combine(SegmentPruner other)

Specified by:

combine in interface SegmentPruner

Returns:

combined SegmentPruner, which if both are of the same type may be merged into a new pruner of the same type that contains the information of both, or if not directly combinable, implementors should create a CompositeSegmentPruner

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