io.druid.query

Class Queries

java.lang.Object

io.druid.query.Queries

public class Queries
extends Object

Constructor Summary

Constructors

Constructor and Description
Queries()

Method Summary

Modifier and Type	Method and Description
static List<PostAggregator>	decoratePostAggregators(List<PostAggregator> postAggs, Map<String,AggregatorFactory> aggFactories)
static List<PostAggregator>	prepareAggregations(List<AggregatorFactory> aggFactories, List<PostAggregator> postAggs) Deprecated.
static List<PostAggregator>	prepareAggregations(List<String> otherOutputNames, List<AggregatorFactory> aggFactories, List<PostAggregator> postAggs) Returns decorated post-aggregators, based on original un-decorated post-aggregators.

Methods inherited from class java.lang.Object

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

Constructor Detail

Queries

public Queries()

Method Detail

decoratePostAggregators

public static List<PostAggregator> decoratePostAggregators(List<PostAggregator> postAggs,
                                                           Map<String,AggregatorFactory> aggFactories)

prepareAggregations

@Deprecated
public static List<PostAggregator> prepareAggregations(List<AggregatorFactory> aggFactories,
                                                                   List<PostAggregator> postAggs)

Deprecated.

Like prepareAggregations(List, List, List) but with otherOutputNames as an empty list. Deprecated because it makes it easy to forget to include dimensions, etc. in "otherOutputNames".

Parameters:

aggFactories - aggregator factories for this query

postAggs - post-aggregators for this query

Returns:

decorated post-aggregators

Throws:

NullPointerException - if aggFactories is null

IllegalArgumentException - if there are any output name collisions or missing post-aggregator inputs

prepareAggregations

public static List<PostAggregator> prepareAggregations(List<String> otherOutputNames,
                                                       List<AggregatorFactory> aggFactories,
                                                       List<PostAggregator> postAggs)

Returns decorated post-aggregators, based on original un-decorated post-aggregators. In addition, this method also verifies that there are no output name collisions, and that all of the post-aggregators' required input fields are present.

Parameters:

otherOutputNames - names of fields that will appear in the same output namespace as aggregators and post-aggregators, and are also assumed to be valid inputs to post-aggregators. For most built-in query types, this is either empty, or the list of dimension output names.

aggFactories - aggregator factories for this query

postAggs - post-aggregators for this query

Returns:

decorated post-aggregators

Throws:

NullPointerException - if otherOutputNames or aggFactories is null

IllegalArgumentException - if there are any output name collisions or missing post-aggregator inputs