org.apache.lucene.search.grouping
Class SearchGroup<GROUP_VALUE_TYPE>
java.lang.Object
org.apache.lucene.search.grouping.SearchGroup<GROUP_VALUE_TYPE>
public class SearchGroup<GROUP_VALUE_TYPE>
- extends Object
Represents a group that is found during the first pass search.
- WARNING: This API is experimental and might change in incompatible ways in the next release.
groupValue
public GROUP_VALUE_TYPE groupValue
- The value that defines this group
sortValues
public Object[] sortValues
- The sort values used during sorting. These are the
groupSort field values of the highest rank document
(by the groupSort) within the group. Can be
null
if fillFields=false
had
been passed to AbstractFirstPassGroupingCollector.getTopGroups(int, boolean)
SearchGroup
public SearchGroup()
toString
public String toString()
- Overrides:
toString
in class Object
merge
public static <T> Collection<SearchGroup<T>> merge(List<Collection<SearchGroup<T>>> topGroups,
int offset,
int topN,
Sort groupSort)
throws IOException
- Merges multiple collections of top groups, for example
obtained from separate index shards. The provided
groupSort must match how the groups were sorted, and
the provided SearchGroups must have been computed
with fillFields=true passed to
AbstractFirstPassGroupingCollector.getTopGroups(int, boolean)
.
NOTE: this returns null if the topGroups is empty.
- Throws:
IOException
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