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java.lang.Object org.apache.lucene.facet.sortedset.SortedSetDocValuesReaderState
public final class SortedSetDocValuesReaderState
Wraps a IndexReader
and resolves ords
using existing SortedSetDocValues
APIs without a
separate taxonomy index. This only supports flat facets
(dimension + label), and it makes faceting a bit
slower, adds some cost at reopen time, but avoids
managing the separate taxonomy index. It also requires
less RAM than the taxonomy index, as it manages the flat
(2-level) hierarchy more efficiently. In addition, the
tie-break during faceting is now meaningful (in label
sorted order).
NOTE: creating an instance of this class is
somewhat costly, as it computes per-segment ordinal maps,
so you should create it once and re-use that one instance
for a given IndexReader
.
Field Summary | |
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static String |
FACET_FIELD_EXTENSION
Extension added to CategoryListParams.field
to determin which field to read/write facet ordinals from/to. |
Constructor Summary | |
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SortedSetDocValuesReaderState(FacetIndexingParams fip,
IndexReader reader)
Create an instance, scanning the SortedSetDocValues from the provided reader and
FacetIndexingParams . |
|
SortedSetDocValuesReaderState(IndexReader reader)
Create an instance, scanning the SortedSetDocValues from the provided reader, with
default FacetIndexingParams . |
Method Summary |
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Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final String FACET_FIELD_EXTENSION
CategoryListParams.field
to determin which field to read/write facet ordinals from/to.
Constructor Detail |
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public SortedSetDocValuesReaderState(IndexReader reader) throws IOException
SortedSetDocValues
from the provided reader, with
default FacetIndexingParams
.
IOException
public SortedSetDocValuesReaderState(FacetIndexingParams fip, IndexReader reader) throws IOException
SortedSetDocValues
from the provided reader and
FacetIndexingParams
.
IOException
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