org.apache.lucene.codecs.lucene86

## Class Lucene86PointsFormat

- java.lang.Object
- - org.apache.lucene.codecs.PointsFormat
  - - org.apache.lucene.codecs.lucene86.Lucene86PointsFormat

-     public final class Lucene86PointsFormat
      extends PointsFormat

  Lucene 8.6 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 .kdm 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.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `DATA_EXTENSION` Filename extension for the leaf blocks
    `static String` | `INDEX_EXTENSION` Filename extension for the index per field
    `static String` | `META_EXTENSION` Filename extension for the meta per field

    - ### Fields inherited from class org.apache.lucene.codecs.PointsFormat

      `EMPTY`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Lucene86PointsFormat()` Sole constructor

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `PointsReader` | `fieldsReader(SegmentReadState state)` Reads a segment.
    `PointsWriter` | `fieldsWriter(SegmentWriteState state)` Writes a new segment

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### DATA_EXTENSION

          public static final String DATA_EXTENSION

      Filename extension for the leaf blocks
      See Also:
        Constant Field Values

    - #### INDEX_EXTENSION

          public static final String INDEX_EXTENSION

      Filename extension for the index per field
      See Also:
        Constant Field Values

    - #### META_EXTENSION

          public static final String META_EXTENSION

      Filename extension for the meta per field
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### Lucene86PointsFormat

          public Lucene86PointsFormat()

      Sole constructor

  - ### Method Detail

    - #### fieldsWriter

          public PointsWriter fieldsWriter(SegmentWriteState state)
                                    throws IOException

      Description copied from class: `PointsFormat`
      Writes a new segment
      Specified by:
        `fieldsWriter` in class `PointsFormat`
      Throws:
        `IOException`

    - #### fieldsReader

          public PointsReader fieldsReader(SegmentReadState state)
                                    throws IOException

      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 class `PointsFormat`
      Throws:
        `IOException`

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