Class Lucene90PointsFormat
java.lang.Object
org.apache.lucene.codecs.PointsFormat
org.apache.lucene.codecs.lucene90.Lucene90PointsFormat
Lucene 9.0 point format, which encodes dimensional values in a block KD-tree structure for fast
1D range and N dimensional shape intersection filtering. See this paper for
details.
Data is stored across three files
- A .kdm file that records metadata about the fields, such as numbers of dimensions or numbers of bytes per dimension.
- A .kdi file that stores inner nodes of the tree.
- A .kdd file that stores leaf nodes, where most of the data lives.
- WARNING: This API is experimental and might change in incompatible ways in the next release.
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Field Summary
Modifier and TypeFieldDescriptionstatic final String
Filename extension for the leaf blocksstatic final String
Filename extension for the index per fieldstatic final String
Filename extension for the meta per fieldFields inherited from class org.apache.lucene.codecs.PointsFormat
EMPTY
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionfieldsReader
(SegmentReadState state) Reads a segment.fieldsWriter
(SegmentWriteState state) Writes a new segment
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Field Details
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DATA_EXTENSION
Filename extension for the leaf blocks- See Also:
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INDEX_EXTENSION
Filename extension for the index per field- See Also:
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META_EXTENSION
Filename extension for the meta per field- See Also:
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Constructor Details
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Lucene90PointsFormat
public Lucene90PointsFormat()Sole constructor
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Method Details
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fieldsWriter
Description copied from class:PointsFormat
Writes a new segment- Specified by:
fieldsWriter
in classPointsFormat
- Throws:
IOException
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fieldsReader
Description copied from class:PointsFormat
Reads a segment. NOTE: by the time this call returns, it must hold open any files it will need to use; else, those files may be deleted. Additionally, required files may be deleted during the execution of this call before there is a chance to open them. Under these circumstances an IOException should be thrown by the implementation. IOExceptions are expected and will automatically cause a retry of the segment opening logic with the newly revised segments.- Specified by:
fieldsReader
in classPointsFormat
- Throws:
IOException
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