public class TermDistinctValuesCollector extends DistinctValuesCollector<BytesRef>
DistinctValuesCollector that relies
on SortedDocValues to count the distinct values per group.| Modifier and Type | Class and Description |
|---|---|
static class |
TermDistinctValuesCollector.TermGroupCount
Holds distinct values for a single group.
|
DistinctValuesCollector.GroupCount<T>| Constructor and Description |
|---|
TermDistinctValuesCollector(String groupField,
String countField,
Collection<SearchGroup<BytesRef>> groups)
Constructs
TermDistinctValuesCollector instance. |
| Modifier and Type | Method and Description |
|---|---|
void |
collect(int doc)
Called once for every document matching a query, with the unbased document
number.
|
protected void |
doSetNextReader(LeafReaderContext context)
This method is called before collecting
context. |
List<DistinctValuesCollector.GroupCount<BytesRef>> |
getGroups()
Returns all unique values for each top N group.
|
needsScoresgetLeafCollector, setScorerpublic TermDistinctValuesCollector(String groupField, String countField, Collection<SearchGroup<BytesRef>> groups)
TermDistinctValuesCollector instance.groupField - The field to group bycountField - The field to count distinct values forgroups - The top N groups, collected during the first phase searchpublic void collect(int doc) throws IOException
LeafCollectorNote: The collection of the current segment can be terminated by throwing
a CollectionTerminatedException. In this case, the last docs of the
current LeafReaderContext will be skipped and IndexSearcher
will swallow the exception and continue collection with the next leaf.
Note: This is called in an inner search loop. For good search performance,
implementations of this method should not call IndexSearcher.doc(int) or
IndexReader.document(int) on every hit.
Doing so can slow searches by an order of magnitude or more.
collect in interface LeafCollectorcollect in class SimpleCollectorIOExceptionpublic List<DistinctValuesCollector.GroupCount<BytesRef>> getGroups()
DistinctValuesCollectorgetGroups in class DistinctValuesCollector<BytesRef>protected void doSetNextReader(LeafReaderContext context) throws IOException
SimpleCollectorcontext.doSetNextReader in class SimpleCollectorIOException