Provides index sorting capablities. The application can use one of the
pre-existing Sorter implementations, e.g. to sort by a
reverse the order
of the documents. Additionally, the application can implement a custom
Sorter which returns a permutation on
AtomicReader's document IDs, to sort
the input documents by additional criteria.
SortingMergePolicy can be used to
make Lucene sort segments before merging them. This will ensure that every
segment resulting from a merge will be sorted according to the provided
Sorter. This however makes merging and
thus indexing slower.
Sorted segments allow for early query termination when the sort order matches index order. This makes query execution faster since not all documents need to be visited. Please note that this is an expert feature and should not be used without a deep understanding of Lucene merging and document collection.
Class Summary Class Description BlockJoinSorterHelper class to sort readers that contain blocks of documents. EarlyTerminatingSortingCollector NumericDocValuesSorter SorterSorts documents of a given index by returning a permutation on the document IDs. Sorter.DocComparatorA comparator of doc IDs. Sorter.DocMapA permutation of doc IDs. SortingAtomicReader SortingMergePolicy