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| <h1 id="Lucene_Net_Codecs_Lucene45_Lucene45DocValuesFormat" data-uid="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesFormat" class="text-break">Class Lucene45DocValuesFormat |
| </h1> |
| <div class="markdown level0 summary"><p>Lucene 4.5 DocValues format. |
| <p> |
| Encodes the four per-document value types (Numeric,Binary,Sorted,SortedSet) with these strategies: |
| <p> |
| <a class="xref" href="Lucene.Net.Index.DocValuesType.html#Lucene_Net_Index_DocValuesType_NUMERIC">NUMERIC</a>: |
| <ul><li>Delta-compressed: per-document integers written in blocks of 16k. For each block |
| the minimum value in that block is encoded, and each entry is a delta from that |
| minimum value. Each block of deltas is compressed with bitpacking. For more |
| information, see <a class="xref" href="Lucene.Net.Util.Packed.BlockPackedWriter.html">BlockPackedWriter</a>.</li><li>Table-compressed: when the number of unique values is very small (< 256), and |
| when there are unused "gaps" in the range of values used (such as <a class="xref" href="Lucene.Net.Util.SmallSingle.html">SmallSingle</a>), |
| a lookup table is written instead. Each per-document entry is instead the ordinal |
| to this table, and those ordinals are compressed with bitpacking (<a class="xref" href="Lucene.Net.Util.Packed.PackedInt32s.html">PackedInt32s</a>).</li><li>GCD-compressed: when all numbers share a common divisor, such as dates, the greatest |
| common denominator (GCD) is computed, and quotients are stored using Delta-compressed Numerics.</li></ul> |
| <p> |
| <a class="xref" href="Lucene.Net.Index.DocValuesType.html#Lucene_Net_Index_DocValuesType_BINARY">BINARY</a>: |
| <ul><li>Fixed-width Binary: one large concatenated <span class="xref">byte[]</span> is written, along with the fixed length. |
| Each document's value can be addressed directly with multiplication (<code>docID * length</code>).</li><li>Variable-width Binary: one large concatenated <span class="xref">byte[]</span> is written, along with end addresses |
| for each document. The addresses are written in blocks of 16k, with the current absolute |
| start for the block, and the average (expected) delta per entry. For each document the |
| deviation from the delta (actual - expected) is written.</li><li>Prefix-compressed Binary: values are written in chunks of 16, with the first value written |
| completely and other values sharing prefixes. Chunk addresses are written in blocks of 16k, |
| with the current absolute start for the block, and the average (expected) delta per entry. |
| For each chunk the deviation from the delta (actual - expected) is written.</li></ul> |
| <p> |
| <a class="xref" href="Lucene.Net.Index.DocValuesType.html#Lucene_Net_Index_DocValuesType_SORTED">SORTED</a>: |
| <ul><li>Sorted: a mapping of ordinals to deduplicated terms is written as Prefix-Compressed Binary, |
| along with the per-document ordinals written using one of the numeric strategies above.</li></ul> |
| <p> |
| <a class="xref" href="Lucene.Net.Index.DocValuesType.html#Lucene_Net_Index_DocValuesType_SORTED_SET">SORTED_SET</a>: |
| <ul><li>SortedSet: a mapping of ordinals to deduplicated terms is written as Prefix-Compressed Binary, |
| an ordinal list and per-document index into this list are written using the numeric strategies |
| above.</li></ul> |
| <p> |
| Files: |
| <ol><li><code>.dvd</code>: DocValues data</li><li><code>.dvm</code>: DocValues metadata</li></ol> |
| <ol><li><a name="dvm" id="dvm"></a> |
| <p>The DocValues metadata or .dvm file.</p> |
| <p>For DocValues field, this stores metadata, such as the offset into the |
| DocValues data (.dvd)</p> |
| <p>DocValues metadata (.dvm) --> Header,<Entry><sup>NumFields</sup>,Footer</p> |
| <ul><li>Entry --> NumericEntry | BinaryEntry | SortedEntry | SortedSetEntry</li><li>NumericEntry --> GCDNumericEntry | TableNumericEntry | DeltaNumericEntry</li><li>GCDNumericEntry --> NumericHeader,MinValue,GCD</li><li>TableNumericEntry --> NumericHeader,TableSize,Int64 (<a class="xref" href="Lucene.Net.Store.DataOutput.html#Lucene_Net_Store_DataOutput_WriteInt64_System_Int64_">WriteInt64(Int64)</a>) <sup>TableSize</sup></li><li>DeltaNumericEntry --> NumericHeader</li><li>NumericHeader --> FieldNumber,EntryType,NumericType,MissingOffset,PackedVersion,DataOffset,Count,BlockSize</li><li>BinaryEntry --> FixedBinaryEntry | VariableBinaryEntry | PrefixBinaryEntry</li><li>FixedBinaryEntry --> BinaryHeader</li><li>VariableBinaryEntry --> BinaryHeader,AddressOffset,PackedVersion,BlockSize</li><li>PrefixBinaryEntry --> BinaryHeader,AddressInterval,AddressOffset,PackedVersion,BlockSize</li><li>BinaryHeader --> FieldNumber,EntryType,BinaryType,MissingOffset,MinLength,MaxLength,DataOffset</li><li>SortedEntry --> FieldNumber,EntryType,BinaryEntry,NumericEntry</li><li>SortedSetEntry --> EntryType,BinaryEntry,NumericEntry,NumericEntry</li><li>FieldNumber,PackedVersion,MinLength,MaxLength,BlockSize,ValueCount --> VInt (<a class="xref" href="Lucene.Net.Store.DataOutput.html#Lucene_Net_Store_DataOutput_WriteVInt32_System_Int32_">WriteVInt32(Int32)</a></li><li>EntryType,CompressionType --> Byte (<a class="xref" href="Lucene.Net.Store.DataOutput.html#Lucene_Net_Store_DataOutput_WriteByte_System_Byte_">WriteByte(Byte)</a></li><li>Header --> CodecHeader (<a class="xref" href="Lucene.Net.Codecs.CodecUtil.html#Lucene_Net_Codecs_CodecUtil_WriteHeader_Lucene_Net_Store_DataOutput_System_String_System_Int32_">WriteHeader(DataOutput, String, Int32)</a>) </li><li>MinValue,GCD,MissingOffset,AddressOffset,DataOffset --> Int64 (<a class="xref" href="Lucene.Net.Store.DataOutput.html#Lucene_Net_Store_DataOutput_WriteInt64_System_Int64_">WriteInt64(Int64)</a>) </li><li>TableSize --> vInt (<a class="xref" href="Lucene.Net.Store.DataOutput.html#Lucene_Net_Store_DataOutput_WriteVInt32_System_Int32_">WriteVInt32(Int32)</a>) </li><li>Footer --> CodecFooter (<a class="xref" href="Lucene.Net.Codecs.CodecUtil.html#Lucene_Net_Codecs_CodecUtil_WriteFooter_Lucene_Net_Store_IndexOutput_">WriteFooter(IndexOutput)</a>) </li></ul> |
| <p>Sorted fields have two entries: a <a class="xref" href="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesProducer.BinaryEntry.html">Lucene45DocValuesProducer.BinaryEntry</a> with the value metadata, |
| and an ordinary <a class="xref" href="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesProducer.NumericEntry.html">Lucene45DocValuesProducer.NumericEntry</a> for the document-to-ord metadata.</p> |
| <p>SortedSet fields have three entries: a <a class="xref" href="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesProducer.BinaryEntry.html">Lucene45DocValuesProducer.BinaryEntry</a> with the value metadata, |
| and two <a class="xref" href="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesProducer.NumericEntry.html">Lucene45DocValuesProducer.NumericEntry</a>s for the document-to-ord-index and ordinal list metadata.</p> |
| <p>FieldNumber of -1 indicates the end of metadata.</p> |
| <p>EntryType is a 0 (<a class="xref" href="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesProducer.NumericEntry.html">Lucene45DocValuesProducer.NumericEntry</a>) or 1 (<a class="xref" href="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesProducer.BinaryEntry.html">Lucene45DocValuesProducer.BinaryEntry</a>)</p> |
| <p>DataOffset is the pointer to the start of the data in the DocValues data (.dvd)</p> |
| <p>NumericType indicates how Numeric values will be compressed: |
| <ul><li>0 --> delta-compressed. For each block of 16k integers, every integer is delta-encoded |
| from the minimum value within the block.</li><li>1 --> gcd-compressed. When all integers share a common divisor, only quotients are stored |
| using blocks of delta-encoded ints.</li><li>2 --> table-compressed. When the number of unique numeric values is small and it would save space, |
| a lookup table of unique values is written, followed by the ordinal for each document.</li></ul> |
| <p>BinaryType indicates how Binary values will be stored: |
| <ul><li>0 --> fixed-width. All values have the same length, addressing by multiplication.</li><li>1 --> variable-width. An address for each value is stored.</li><li>2 --> prefix-compressed. An address to the start of every interval'th value is stored.</li></ul> |
| <p>MinLength and MaxLength represent the min and max byte[] value lengths for Binary values. |
| If they are equal, then all values are of a fixed size, and can be addressed as DataOffset + (docID * length). |
| Otherwise, the binary values are of variable size, and packed integer metadata (PackedVersion,BlockSize) |
| is written for the addresses. |
| <p>MissingOffset points to a <span class="xref">byte[]</span> containing a bitset of all documents that had a value for the field. |
| If its -1, then there are no missing values. |
| <p>Checksum contains the CRC32 checksum of all bytes in the .dvm file up |
| until the checksum. this is used to verify integrity of the file on opening the |
| index.</li><li><a name="dvd" id="dvd"></a> |
| <p>The DocValues data or .dvd file.</p> |
| <p>For DocValues field, this stores the actual per-document data (the heavy-lifting)</p> |
| <p>DocValues data (.dvd) --> Header,<NumericData | BinaryData | SortedData><sup>NumFields</sup>,Footer</p> |
| <ul><li>NumericData --> DeltaCompressedNumerics | TableCompressedNumerics | GCDCompressedNumerics</li><li>BinaryData --> Byte (<a class="xref" href="Lucene.Net.Store.DataOutput.html#Lucene_Net_Store_DataOutput_WriteByte_System_Byte_">WriteByte(Byte)</a>) <sup>DataLength</sup>,Addresses</li><li>SortedData --> FST<Int64> (<a class="xref" href="Lucene.Net.Util.Fst.FST-1.html">FST<T></a>) </li><li>DeltaCompressedNumerics --> BlockPackedInts(blockSize=16k) (<a class="xref" href="Lucene.Net.Util.Packed.BlockPackedWriter.html">BlockPackedWriter</a>) </li><li>TableCompressedNumerics --> PackedInts (<a class="xref" href="Lucene.Net.Util.Packed.PackedInt32s.html">PackedInt32s</a>) </li><li>GCDCompressedNumerics --> BlockPackedInts(blockSize=16k) (<a class="xref" href="Lucene.Net.Util.Packed.BlockPackedWriter.html">BlockPackedWriter</a>) </li><li>Addresses --> MonotonicBlockPackedInts(blockSize=16k) (<a class="xref" href="Lucene.Net.Util.Packed.MonotonicBlockPackedWriter.html">MonotonicBlockPackedWriter</a>) </li><li>Footer --> CodecFooter (<a class="xref" href="Lucene.Net.Codecs.CodecUtil.html#Lucene_Net_Codecs_CodecUtil_WriteFooter_Lucene_Net_Store_IndexOutput_">WriteFooter(IndexOutput)</a>) </li></ul> |
| <p>SortedSet entries store the list of ordinals in their BinaryData as a |
| sequences of increasing vLongs (<a class="xref" href="Lucene.Net.Store.DataOutput.html#Lucene_Net_Store_DataOutput_WriteVInt64_System_Int64_">WriteVInt64(Int64)</a>), delta-encoded.</p></li></ol> |
| <p> |
| <div class="lucene-block lucene-experimental">This is a Lucene.NET EXPERIMENTAL API, use at your own risk</div></div> |
| <div class="markdown level0 conceptual"></div> |
| <div class="inheritance"> |
| <h5>Inheritance</h5> |
| <div class="level0"><span class="xref">System.Object</span></div> |
| <div class="level1"><a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html">DocValuesFormat</a></div> |
| <div class="level2"><span class="xref">Lucene45DocValuesFormat</span></div> |
| </div> |
| <div class="inheritedMembers"> |
| <h5>Inherited Members</h5> |
| <div> |
| <a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_SetDocValuesFormatFactory_Lucene_Net_Codecs_IDocValuesFormatFactory_">DocValuesFormat.SetDocValuesFormatFactory(IDocValuesFormatFactory)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_GetDocValuesFormatFactory">DocValuesFormat.GetDocValuesFormatFactory()</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_Name">DocValuesFormat.Name</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_ToString">DocValuesFormat.ToString()</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_ForName_System_String_">DocValuesFormat.ForName(String)</a> |
| </div> |
| <div> |
| <a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_AvailableDocValuesFormats">DocValuesFormat.AvailableDocValuesFormats</a> |
| </div> |
| <div> |
| <span class="xref">System.Object.Equals(System.Object)</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.Equals(System.Object, System.Object)</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.GetHashCode()</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.GetType()</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.MemberwiseClone()</span> |
| </div> |
| <div> |
| <span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span> |
| </div> |
| </div> |
| <h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Codecs.Lucene45.html">Lucene.Net.Codecs.Lucene45</a></h6> |
| <h6><strong>Assembly</strong>: Lucene.Net.dll</h6> |
| <h5 id="Lucene_Net_Codecs_Lucene45_Lucene45DocValuesFormat_syntax">Syntax</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">[DocValuesFormatName("Lucene45")] |
| public sealed class Lucene45DocValuesFormat : DocValuesFormat</code></pre> |
| </div> |
| <h3 id="constructors">Constructors |
| </h3> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Codecs_Lucene45_Lucene45DocValuesFormat__ctor.md&value=---%0Auid%3A%20Lucene.Net.Codecs.Lucene45.Lucene45DocValuesFormat.%23ctor%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net/Codecs/Lucene45/Lucene45DocValuesFormat.cs/#L159">View Source</a> |
| </span> |
| <a id="Lucene_Net_Codecs_Lucene45_Lucene45DocValuesFormat__ctor_" data-uid="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesFormat.#ctor*"></a> |
| <h4 id="Lucene_Net_Codecs_Lucene45_Lucene45DocValuesFormat__ctor" data-uid="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesFormat.#ctor">Lucene45DocValuesFormat()</h4> |
| <div class="markdown level1 summary"><p>Sole Constructor </p> |
| </div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public Lucene45DocValuesFormat()</code></pre> |
| </div> |
| <h3 id="methods">Methods |
| </h3> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Codecs_Lucene45_Lucene45DocValuesFormat_FieldsConsumer_Lucene_Net_Index_SegmentWriteState_.md&value=---%0Auid%3A%20Lucene.Net.Codecs.Lucene45.Lucene45DocValuesFormat.FieldsConsumer(Lucene.Net.Index.SegmentWriteState)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net/Codecs/Lucene45/Lucene45DocValuesFormat.cs/#L164">View Source</a> |
| </span> |
| <a id="Lucene_Net_Codecs_Lucene45_Lucene45DocValuesFormat_FieldsConsumer_" data-uid="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesFormat.FieldsConsumer*"></a> |
| <h4 id="Lucene_Net_Codecs_Lucene45_Lucene45DocValuesFormat_FieldsConsumer_Lucene_Net_Index_SegmentWriteState_" data-uid="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesFormat.FieldsConsumer(Lucene.Net.Index.SegmentWriteState)">FieldsConsumer(SegmentWriteState)</h4> |
| <div class="markdown level1 summary"></div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override DocValuesConsumer FieldsConsumer(SegmentWriteState state)</code></pre> |
| </div> |
| <h5 class="parameters">Parameters</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Name</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a class="xref" href="Lucene.Net.Index.SegmentWriteState.html">SegmentWriteState</a></td> |
| <td><span class="parametername">state</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="returns">Returns</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a class="xref" href="Lucene.Net.Codecs.DocValuesConsumer.html">DocValuesConsumer</a></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="overrides">Overrides</h5> |
| <div><a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_FieldsConsumer_Lucene_Net_Index_SegmentWriteState_">DocValuesFormat.FieldsConsumer(SegmentWriteState)</a></div> |
| <span class="small pull-right mobile-hide"> |
| <span class="divider">|</span> |
| <a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Codecs_Lucene45_Lucene45DocValuesFormat_FieldsProducer_Lucene_Net_Index_SegmentReadState_.md&value=---%0Auid%3A%20Lucene.Net.Codecs.Lucene45.Lucene45DocValuesFormat.FieldsProducer(Lucene.Net.Index.SegmentReadState)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a> |
| </span> |
| <span class="small pull-right mobile-hide"> |
| <a href="https://github.com/NightOwl888/lucenenet/blob/fix/apidocs-layout/src/Lucene.Net/Codecs/Lucene45/Lucene45DocValuesFormat.cs/#L170">View Source</a> |
| </span> |
| <a id="Lucene_Net_Codecs_Lucene45_Lucene45DocValuesFormat_FieldsProducer_" data-uid="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesFormat.FieldsProducer*"></a> |
| <h4 id="Lucene_Net_Codecs_Lucene45_Lucene45DocValuesFormat_FieldsProducer_Lucene_Net_Index_SegmentReadState_" data-uid="Lucene.Net.Codecs.Lucene45.Lucene45DocValuesFormat.FieldsProducer(Lucene.Net.Index.SegmentReadState)">FieldsProducer(SegmentReadState)</h4> |
| <div class="markdown level1 summary"></div> |
| <div class="markdown level1 conceptual"></div> |
| <h5 class="decalaration">Declaration</h5> |
| <div class="codewrapper"> |
| <pre><code class="lang-csharp hljs">public override DocValuesProducer FieldsProducer(SegmentReadState state)</code></pre> |
| </div> |
| <h5 class="parameters">Parameters</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Name</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a class="xref" href="Lucene.Net.Index.SegmentReadState.html">SegmentReadState</a></td> |
| <td><span class="parametername">state</span></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="returns">Returns</h5> |
| <table class="table table-bordered table-striped table-condensed"> |
| <thead> |
| <tr> |
| <th>Type</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><a class="xref" href="Lucene.Net.Codecs.DocValuesProducer.html">DocValuesProducer</a></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h5 class="overrides">Overrides</h5> |
| <div><a class="xref" href="Lucene.Net.Codecs.DocValuesFormat.html#Lucene_Net_Codecs_DocValuesFormat_FieldsProducer_Lucene_Net_Index_SegmentReadState_">DocValuesFormat.FieldsProducer(SegmentReadState)</a></div> |
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