Class 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.
    • Field Detail

      • DATA_EXTENSION

        public static final java.lang.String DATA_EXTENSION
        Filename extension for the leaf blocks
        See Also:
        Constant Field Values
      • INDEX_EXTENSION

        public static final java.lang.String INDEX_EXTENSION
        Filename extension for the index per field
        See Also:
        Constant Field Values
      • META_EXTENSION

        public static final java.lang.String META_EXTENSION
        Filename extension for the meta per field
        See Also:
        Constant Field Values
    • Constructor Detail

      • Lucene86PointsFormat

        public Lucene86PointsFormat()
        Sole constructor
    • Method Detail

      • fieldsReader

        public PointsReader fieldsReader​(SegmentReadState state)
                                  throws java.io.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:
        java.io.IOException