io.druid.query.filter

Class DimFilterUtils

java.lang.Object

io.druid.query.filter.DimFilterUtils

public class DimFilterUtils
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static byte	STRING_SEPARATOR

Constructor Summary

Constructors

Constructor and Description
DimFilterUtils()

Method Summary

Modifier and Type	Method and Description
static <T> Set<T>	filterShards(DimFilter dimFilter, Iterable<T> input, com.google.common.base.Function<T,ShardSpec> converter) 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 <T> Set<T>	filterShards(DimFilter dimFilter, Iterable<T> input, com.google.common.base.Function<T,ShardSpec> converter, Map<String,com.google.common.base.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).

Methods inherited from class java.lang.Object

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

Field Detail

STRING_SEPARATOR

public static final byte STRING_SEPARATOR

See Also:

Constant Field Values

Constructor Detail

DimFilterUtils

public DimFilterUtils()

Method Detail

filterShards

public static <T> Set<T> filterShards(DimFilter dimFilter,
                                      Iterable<T> input,
                                      com.google.common.base.Function<T,ShardSpec> converter)

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. If you plan to call this multiple times with the same dimFilter, consider using filterShards(DimFilter, Iterable, Function, Map) instead with a cached map

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

input - The iterable of objects to be filtered

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

Returns:

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

filterShards

public static <T> Set<T> filterShards(DimFilter dimFilter,
                                      Iterable<T> input,
                                      com.google.common.base.Function<T,ShardSpec> converter,
                                      Map<String,com.google.common.base.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

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