QuerySegmentWalker (druid-processing 28.0.0 API)

```
public interface QuerySegmentWalker
```
An interface for query-handling entry points.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`<T> QueryRunner<T>`	`getQueryRunnerForIntervals(Query<T> query, Iterable<org.joda.time.Interval> intervals)`	Gets the Queryable for a given interval, the Queryable returned can be any version(s) or partitionNumber(s) such that it represents the interval.
`<T> QueryRunner<T>`	`getQueryRunnerForSegments(Query<T> query, Iterable<SegmentDescriptor> specs)`	Gets the Queryable for a given list of SegmentDescriptors.

- Method Detail
  - getQueryRunnerForIntervals
```
<T> QueryRunner<T> getQueryRunnerForIntervals(Query<T> query,
                                              Iterable<org.joda.time.Interval> intervals)
```
    Gets the Queryable for a given interval, the Queryable returned can be any version(s) or partitionNumber(s) such that it represents the interval.
    
    Type Parameters:
    
    T - query result type
    
    Parameters:
    
    query - the query to find a Queryable for
    
    intervals - the intervals to find a Queryable for
    
    Returns:
    
    a Queryable object that represents the interval
  - getQueryRunnerForSegments
```
<T> QueryRunner<T> getQueryRunnerForSegments(Query<T> query,
                                             Iterable<SegmentDescriptor> specs)
```
    Gets the Queryable for a given list of SegmentDescriptors. The descriptors are expected to apply to the base datasource involved in the query, i.e. the one returned by:
    DataSourceAnalysis.forDataSource(query.getDataSource()).getBaseDataSource()
    Type Parameters:
    
    T - the query result type
    
    Parameters:
    
    query - the query to return a Queryable for
    
    specs - the list of SegmentSpecs to find a Queryable for
    
    Returns:
    
    the Queryable object with the given SegmentSpecs