io.druid.query.aggregation

Class AggregatorUtil

java.lang.Object

io.druid.query.aggregation.AggregatorUtil

public class AggregatorUtil
extends Object

Constructor Summary

Constructors

Constructor and Description
AggregatorUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static com.metamx.common.Pair<List<AggregatorFactory>,List<PostAggregator>>	condensedAggregators(List<AggregatorFactory> aggList, List<PostAggregator> postAggList, String metric)
static List<PostAggregator>	pruneDependentPostAgg(List<PostAggregator> postAggregatorList, String postAggName) returns the list of dependent postAggregators that should be calculated in order to calculate given postAgg

Methods inherited from class java.lang.Object

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

Constructor Detail

AggregatorUtil

public AggregatorUtil()

Method Detail

pruneDependentPostAgg

public static List<PostAggregator> pruneDependentPostAgg(List<PostAggregator> postAggregatorList,
                                         String postAggName)

returns the list of dependent postAggregators that should be calculated in order to calculate given postAgg

Parameters:

postAggregatorList - List of postAggregator, there is a restriction that the list should be in an order such that all the dependencies of any given aggregator should occur before that aggregator. See AggregatorUtilTest.testOutOfOrderPruneDependentPostAgg for example.

postAggName - name of the postAgg on which dependency is to be calculated

Returns:

the list of dependent postAggregators

condensedAggregators

public static com.metamx.common.Pair<List<AggregatorFactory>,List<PostAggregator>> condensedAggregators(List<AggregatorFactory> aggList,
                                                                                        List<PostAggregator> postAggList,
                                                                                        String metric)