Class | Description |
---|---|
BlockJoinSorter |
Helper class to sort readers that contain blocks of documents.
|
EarlyTerminatingSortingCollector | |
NumericDocValuesSorter |
A
Sorter which sorts documents according to their
NumericDocValues . |
Sorter |
Sorts documents of a given index by returning a permutation on the document
IDs.
|
Sorter.DocComparator |
A comparator of doc IDs.
|
Sorter.DocMap |
A permutation of doc IDs.
|
SortingAtomicReader |
An
AtomicReader which supports sorting documents by a given
Sorter . |
SortingMergePolicy |
A
MergePolicy that reorders documents according to a Sorter
before merging them. |
Provides index sorting capablities. The application can use one of the
pre-existing Sorter implementations, e.g. to sort by a
NumericDocValuesSorter
or reverse
the order
of the documents. Additionally, the application can implement a custom
Sorter
which returns a permutation on
a source 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.
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