org.apache.druid.segment

Interface SegmentWrangler

public interface SegmentWrangler

Utility for creating Segment objects for concrete datasources.

See Also:

to register factories

Method Summary

Modifier and Type	Method and Description
Iterable<Segment>	getSegmentsForIntervals(DataSource dataSource, Iterable<org.joda.time.Interval> intervals) Gets Segments for a particular datasource and set of intervals.

Method Detail

getSegmentsForIntervals

Iterable<Segment> getSegmentsForIntervals(DataSource dataSource,
                                          Iterable<org.joda.time.Interval> intervals)

Gets Segments for a particular datasource and set of intervals. These are expected to exist for any datasource where DataSource.isConcrete() and DataSource.isGlobal() are both true (corresponding to datasources where any Druid server could scan its data). Note: there are no SegmentWranglers for 'table' datasources (Druid's distributed datasources) because those are special and handled in their own special way.

Returns:

Segments that, collectively, contain data for dataSource. May be empty if dataSource does not exist or has no data in the provided intervals. May contain data outside the provided intervals, so callers should filter it down further, e.g. through the "interval" parameter of CursorFactory.makeCursors(org.apache.druid.query.filter.Filter, org.joda.time.Interval, org.apache.druid.segment.VirtualColumns, org.apache.druid.java.util.common.granularity.Granularity, boolean, org.apache.druid.query.QueryMetrics<?>)