Class Lucene90PointsFormat

  • public final class Lucene90PointsFormat
    extends PointsFormat
    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.
    See this wiki for detailed data structures of the three files.
    WARNING: This API is experimental and might change in incompatible ways in the next release.
    • Constructor Detail

      • Lucene90PointsFormat

        public Lucene90PointsFormat()
        Sole constructor
    • Method Detail

      • 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