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Uses of Interface
org.apache.crunch.Aggregator

Packages that use Aggregator

org.apache.crunch	Client-facing API and core abstractions.
org.apache.crunch.fn	Commonly used functions for manipulating collections.

Uses of Aggregator in org.apache.crunch

Methods in org.apache.crunch with parameters of type Aggregator

PTable<K,V>

PGroupedTable.combineValues(Aggregator<V> aggregator) Combine the values in each group using the given Aggregator.

Uses of Aggregator in org.apache.crunch.fn

Classes in org.apache.crunch.fn that implement Aggregator

static class

Aggregators.SimpleAggregator<T> Base class for aggregators that do not require any initialization.

Methods in org.apache.crunch.fn that return Aggregator

static <V> Aggregator<V>	Aggregators.FIRST_N(int n) Return the first n values (or fewer if there are fewer values than n).
static <V> Aggregator<V>	Aggregators.LAST_N(int n) Return the last n values (or fewer if there are fewer values than n).
static Aggregator<BigInteger>	Aggregators.MAX_BIGINTS() Return the maximum of all given BigInteger values.
static Aggregator<BigInteger>	Aggregators.MAX_BIGINTS(int n) Return the n largest BigInteger values (or fewer if there are fewer values than n).
static Aggregator<Double>	Aggregators.MAX_DOUBLES() Return the maximum of all given double values.
static Aggregator<Double>	Aggregators.MAX_DOUBLES(int n) Return the n largest double values (or fewer if there are fewer values than n).
static Aggregator<Float>	Aggregators.MAX_FLOATS() Return the maximum of all given float values.
static Aggregator<Float>	Aggregators.MAX_FLOATS(int n) Return the n largest float values (or fewer if there are fewer values than n).
static Aggregator<Integer>	Aggregators.MAX_INTS() Return the maximum of all given int values.
static Aggregator<Integer>	Aggregators.MAX_INTS(int n) Return the n largest int values (or fewer if there are fewer values than n).
static Aggregator<Long>	Aggregators.MAX_LONGS() Return the maximum of all given long values.
static Aggregator<Long>	Aggregators.MAX_LONGS(int n) Return the n largest long values (or fewer if there are fewer values than n).
static <V extends Comparable<V>> Aggregator<V>	Aggregators.MAX_N(int n, Class<V> cls) Return the n largest values (or fewer if there are fewer values than n).
static Aggregator<BigInteger>	Aggregators.MIN_BIGINTS() Return the minimum of all given BigInteger values.
static Aggregator<BigInteger>	Aggregators.MIN_BIGINTS(int n) Return the n smallest BigInteger values (or fewer if there are fewer values than n).
static Aggregator<Double>	Aggregators.MIN_DOUBLES() Return the minimum of all given double values.
static Aggregator<Double>	Aggregators.MIN_DOUBLES(int n) Return the n smallest double values (or fewer if there are fewer values than n).
static Aggregator<Float>	Aggregators.MIN_FLOATS() Return the minimum of all given float values.
static Aggregator<Float>	Aggregators.MIN_FLOATS(int n) Return the n smallest float values (or fewer if there are fewer values than n).
static Aggregator<Integer>	Aggregators.MIN_INTS() Return the minimum of all given int values.
static Aggregator<Integer>	Aggregators.MIN_INTS(int n) Return the n smallest int values (or fewer if there are fewer values than n).
static Aggregator<Long>	Aggregators.MIN_LONGS() Return the minimum of all given long values.
static Aggregator<Long>	Aggregators.MIN_LONGS(int n) Return the n smallest long values (or fewer if there are fewer values than n).
static <V extends Comparable<V>> Aggregator<V>	Aggregators.MIN_N(int n, Class<V> cls) Return the n smallest values (or fewer if there are fewer values than n).
static <V1,V2> Aggregator<Pair<V1,V2>>	Aggregators.pairAggregator(Aggregator<V1> a1, Aggregator<V2> a2) Apply separate aggregators to each component of a Pair.
static <V1,V2,V3,V4> Aggregator<Tuple4<V1,V2,V3,V4>>	Aggregators.quadAggregator(Aggregator<V1> a1, Aggregator<V2> a2, Aggregator<V3> a3, Aggregator<V4> a4) Apply separate aggregators to each component of a Tuple4.
static <V> Aggregator<V>	Aggregators.SAMPLE_UNIQUE_ELEMENTS(int maximumSampleSize) Collect a sample of unique elements from the input, where 'unique' is defined by the equals method for the input objects.
static Aggregator<String>	Aggregators.STRING_CONCAT(String separator, boolean skipNull) Concatenate strings, with a separator between strings.
static Aggregator<String>	Aggregators.STRING_CONCAT(String separator, boolean skipNull, long maxOutputLength, long maxInputLength) Concatenate strings, with a separator between strings.
static Aggregator<BigInteger>	Aggregators.SUM_BIGINTS() Sum up all BigInteger values.
static Aggregator<Double>	Aggregators.SUM_DOUBLES() Sum up all double values.
static Aggregator<Float>	Aggregators.SUM_FLOATS() Sum up all float values.
static Aggregator<Integer>	Aggregators.SUM_INTS() Sum up all int values.
static Aggregator<Long>	Aggregators.SUM_LONGS() Sum up all long values.
static <V1,V2,V3> Aggregator<Tuple3<V1,V2,V3>>	Aggregators.tripAggregator(Aggregator<V1> a1, Aggregator<V2> a2, Aggregator<V3> a3) Apply separate aggregators to each component of a Tuple3.
static Aggregator<TupleN>	Aggregators.tupleAggregator(Aggregator<?>... aggregators) Apply separate aggregators to each component of a Tuple.
static <V> Aggregator<V>	Aggregators.UNIQUE_ELEMENTS() Collect the unique elements of the input, as defined by the equals method for the input objects.

Methods in org.apache.crunch.fn with parameters of type Aggregator

static <V1,V2> Aggregator<Pair<V1,V2>>	Aggregators.pairAggregator(Aggregator<V1> a1, Aggregator<V2> a2) Apply separate aggregators to each component of a Pair.
static <V1,V2> Aggregator<Pair<V1,V2>>	Aggregators.pairAggregator(Aggregator<V1> a1, Aggregator<V2> a2) Apply separate aggregators to each component of a Pair.
static <V1,V2,V3,V4> Aggregator<Tuple4<V1,V2,V3,V4>>	Aggregators.quadAggregator(Aggregator<V1> a1, Aggregator<V2> a2, Aggregator<V3> a3, Aggregator<V4> a4) Apply separate aggregators to each component of a Tuple4.
static <V1,V2,V3,V4> Aggregator<Tuple4<V1,V2,V3,V4>>	Aggregators.quadAggregator(Aggregator<V1> a1, Aggregator<V2> a2, Aggregator<V3> a3, Aggregator<V4> a4) Apply separate aggregators to each component of a Tuple4.
static <V1,V2,V3,V4> Aggregator<Tuple4<V1,V2,V3,V4>>	Aggregators.quadAggregator(Aggregator<V1> a1, Aggregator<V2> a2, Aggregator<V3> a3, Aggregator<V4> a4) Apply separate aggregators to each component of a Tuple4.
static <V1,V2,V3,V4> Aggregator<Tuple4<V1,V2,V3,V4>>	Aggregators.quadAggregator(Aggregator<V1> a1, Aggregator<V2> a2, Aggregator<V3> a3, Aggregator<V4> a4) Apply separate aggregators to each component of a Tuple4.
static <K,V> CombineFn<K,V>	Aggregators.toCombineFn(Aggregator<V> aggregator) Wrap a CombineFn adapter around the given aggregator.
static <V1,V2,V3> Aggregator<Tuple3<V1,V2,V3>>	Aggregators.tripAggregator(Aggregator<V1> a1, Aggregator<V2> a2, Aggregator<V3> a3) Apply separate aggregators to each component of a Tuple3.
static <V1,V2,V3> Aggregator<Tuple3<V1,V2,V3>>	Aggregators.tripAggregator(Aggregator<V1> a1, Aggregator<V2> a2, Aggregator<V3> a3) Apply separate aggregators to each component of a Tuple3.
static <V1,V2,V3> Aggregator<Tuple3<V1,V2,V3>>	Aggregators.tripAggregator(Aggregator<V1> a1, Aggregator<V2> a2, Aggregator<V3> a3) Apply separate aggregators to each component of a Tuple3.
static Aggregator<TupleN>	Aggregators.tupleAggregator(Aggregator<?>... aggregators) Apply separate aggregators to each component of a Tuple.