com.yahoo.bard.webservice.metadata

Interface QuerySigningService<T>

Type Parameters:

T - the type that corresponds to the id of the set of segments referenced by a druid query.

All Known Implementing Classes:

SegmentIntervalsHashIdGenerator

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface QuerySigningService<T>

Defines the interface of a service that can hold the segment metadata of physical tables.

Method Summary

Modifier and Type	Method and Description
Optional<T>	getSegmentSetId(DruidAggregationQuery<?> query) Return an identifier that corresponds to the set of segments that a query references.

Method Detail

getSegmentSetId

Optional<T> getSegmentSetId(DruidAggregationQuery<?> query)

Return an identifier that corresponds to the set of segments that a query references.

Parameters:

query - The druid aggregation query.

Returns:

An optional that identifies the set of segments referenced by this query. The optional is empty if no segment information was available for this query.