Package org.apache.druid.query.filter

Class DimFilterUtils

java.lang.Object

org.apache.druid.query.filter.DimFilterUtils

public class DimFilterUtils
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final byte	BLOOM_DIM_FILTER_CACHE_ID
static final byte	STRING_SEPARATOR

Constructor Summary

Constructors

Constructor	Description
DimFilterUtils()

Method Summary

Modifier and Type	Method	Description
static <T> Set<T>	filterShards(DimFilter dimFilter, Set<String> filterFields, Iterable<T> input, com.google.common.base.Function<T,ShardSpec> converter, Map<String,Optional<com.google.common.collect.RangeSet<String>>> dimensionRangeCache)	Filter the given iterable of objects by removing any object whose ShardSpec, obtained from the converter function, does not fit in the RangeSet of the dimFilter DimFilter.getDimensionRangeSet(String).
static Set<String>	onlyBaseFields(Set<String> fields, com.google.common.base.Predicate<String> isBaseColumnFn)	Returns a copy of "fields" filtered by the predicate function.

Methods inherited from class java.lang.Object

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

Field Details

BLOOM_DIM_FILTER_CACHE_ID

public static final byte BLOOM_DIM_FILTER_CACHE_ID

See Also:

• Constant Field Values

STRING_SEPARATOR

public static final byte STRING_SEPARATOR

See Also:

• Constant Field Values

Constructor Details

DimFilterUtils

public DimFilterUtils()

Method Details

filterShards

public static <T> Set<T> filterShards(@Nullable
 DimFilter dimFilter,
 @Nullable
 Set<String> filterFields,
 Iterable<T> input,
 com.google.common.base.Function<T,ShardSpec> converter,
 Map<String,Optional<com.google.common.collect.RangeSet<String>>> dimensionRangeCache)

Filter the given iterable of objects by removing any object whose ShardSpec, obtained from the converter function, does not fit in the RangeSet of the dimFilter DimFilter.getDimensionRangeSet(String). The returned set contains the filtered objects in the same order as they appear in input. DimensionRangedCache stores the RangeSets of different dimensions for the dimFilter. It should be re-used between calls with the same dimFilter to save redundant calls of DimFilter.getDimensionRangeSet(String) on same dimensions.

Type Parameters:

T - This can be any type, as long as transform function is provided to convert this to ShardSpec

Parameters:

dimFilter - The filter to use

filterFields - Set of fields to consider for pruning, or null to consider all fields

input - The iterable of objects to be filtered

converter - The function to convert T to ShardSpec that can be filtered by

dimensionRangeCache - The cache of RangeSets of different dimensions for the dimFilter

Returns:

The set of filtered object, in the same order as input

onlyBaseFields

public static Set<String> onlyBaseFields(Set<String> fields,
 com.google.common.base.Predicate<String> isBaseColumnFn)

Returns a copy of "fields" filtered by the predicate function.