225 lines
6.5 KiB
Go
225 lines
6.5 KiB
Go
// Copyright (c) 2017 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package searcher
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import (
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"bytes"
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"github.com/blevesearch/bleve/document"
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"github.com/blevesearch/bleve/geo"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/numeric"
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"github.com/blevesearch/bleve/search"
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)
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type GeoBoundingBoxSearcher struct {
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indexReader index.IndexReader
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field string
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minLon float64
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minLat float64
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maxLon float64
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maxLat float64
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options search.SearcherOptions
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rangeBounds []*geoRange
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searcher *DisjunctionSearcher
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}
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func NewGeoBoundingBoxSearcher(indexReader index.IndexReader, minLon, minLat, maxLon, maxLat float64, field string, boost float64, options search.SearcherOptions) (*GeoBoundingBoxSearcher, error) {
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rv := &GeoBoundingBoxSearcher{
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indexReader: indexReader,
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minLon: minLon,
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minLat: minLat,
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maxLon: maxLon,
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maxLat: maxLat,
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field: field,
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options: options,
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}
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rv.computeRange(0, (geo.GeoBits<<1)-1)
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var termsOnBoundary []search.Searcher
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var termsNotOnBoundary []search.Searcher
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for _, r := range rv.rangeBounds {
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ts, err := NewTermSearcher(indexReader, string(r.cell), field, 1.0, options)
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if err != nil {
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for _, s := range termsOnBoundary {
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_ = s.Close()
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}
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for _, s := range termsNotOnBoundary {
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_ = s.Close()
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}
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return nil, err
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}
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if r.boundary {
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termsOnBoundary = append(termsOnBoundary, ts)
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} else {
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termsNotOnBoundary = append(termsNotOnBoundary, ts)
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}
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}
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onBoundarySearcher, err := NewDisjunctionSearcher(indexReader, termsOnBoundary, 0, options)
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if err != nil {
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for _, s := range termsOnBoundary {
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_ = s.Close()
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}
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for _, s := range termsNotOnBoundary {
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_ = s.Close()
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}
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return nil, err
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}
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filterOnBoundarySearcher := NewFilteringSearcher(onBoundarySearcher, func(d *search.DocumentMatch) bool {
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var lon, lat float64
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var found bool
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err = indexReader.DocumentVisitFieldTerms(d.IndexInternalID, []string{field}, func(field string, term []byte) {
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// only consider the values which are shifted 0
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prefixCoded := numeric.PrefixCoded(term)
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var shift uint
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shift, err = prefixCoded.Shift()
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if err == nil && shift == 0 {
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var i64 int64
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i64, err = prefixCoded.Int64()
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if err == nil {
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lon = geo.MortonUnhashLon(uint64(i64))
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lat = geo.MortonUnhashLat(uint64(i64))
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found = true
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}
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}
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})
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if err == nil && found {
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return geo.BoundingBoxContains(lon, lat, minLon, minLat, maxLon, maxLat)
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}
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return false
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})
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notOnBoundarySearcher, err := NewDisjunctionSearcher(indexReader, termsNotOnBoundary, 0, options)
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if err != nil {
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for _, s := range termsOnBoundary {
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_ = s.Close()
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}
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for _, s := range termsNotOnBoundary {
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_ = s.Close()
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}
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_ = filterOnBoundarySearcher.Close()
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return nil, err
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}
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rv.searcher, err = NewDisjunctionSearcher(indexReader, []search.Searcher{filterOnBoundarySearcher, notOnBoundarySearcher}, 0, options)
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if err != nil {
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for _, s := range termsOnBoundary {
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_ = s.Close()
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}
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for _, s := range termsNotOnBoundary {
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_ = s.Close()
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}
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_ = filterOnBoundarySearcher.Close()
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_ = notOnBoundarySearcher.Close()
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return nil, err
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}
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return rv, nil
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}
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func (s *GeoBoundingBoxSearcher) Count() uint64 {
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return s.searcher.Count()
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}
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func (s *GeoBoundingBoxSearcher) Weight() float64 {
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return s.searcher.Weight()
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}
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func (s *GeoBoundingBoxSearcher) SetQueryNorm(qnorm float64) {
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s.searcher.SetQueryNorm(qnorm)
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}
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func (s *GeoBoundingBoxSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
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return s.searcher.Next(ctx)
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}
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func (s *GeoBoundingBoxSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
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return s.searcher.Advance(ctx, ID)
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}
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func (s *GeoBoundingBoxSearcher) Close() error {
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return s.searcher.Close()
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}
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func (s *GeoBoundingBoxSearcher) Min() int {
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return 0
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}
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func (s *GeoBoundingBoxSearcher) DocumentMatchPoolSize() int {
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return s.searcher.DocumentMatchPoolSize()
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}
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var geoMaxShift = document.GeoPrecisionStep * 4
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var geoDetailLevel = ((geo.GeoBits << 1) - geoMaxShift) / 2
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func (s *GeoBoundingBoxSearcher) computeRange(term uint64, shift uint) {
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split := term | uint64(0x1)<<shift
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var upperMax uint64
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if shift < 63 {
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upperMax = term | ((uint64(1) << (shift + 1)) - 1)
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} else {
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upperMax = 0xffffffffffffffff
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}
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lowerMax := split - 1
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s.relateAndRecurse(term, lowerMax, shift)
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s.relateAndRecurse(split, upperMax, shift)
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}
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func (s *GeoBoundingBoxSearcher) relateAndRecurse(start, end uint64, res uint) {
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minLon := geo.MortonUnhashLon(start)
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minLat := geo.MortonUnhashLat(start)
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maxLon := geo.MortonUnhashLon(end)
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maxLat := geo.MortonUnhashLat(end)
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level := ((geo.GeoBits << 1) - res) >> 1
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within := res%document.GeoPrecisionStep == 0 && s.cellWithin(minLon, minLat, maxLon, maxLat)
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if within || (level == geoDetailLevel && s.cellIntersectShape(minLon, minLat, maxLon, maxLat)) {
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s.rangeBounds = append(s.rangeBounds, newGeoRange(start, res, level, !within))
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} else if level < geoDetailLevel && s.cellIntersectsMBR(minLon, minLat, maxLon, maxLat) {
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s.computeRange(start, res-1)
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}
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}
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func (s *GeoBoundingBoxSearcher) cellWithin(minLon, minLat, maxLon, maxLat float64) bool {
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return geo.RectWithin(minLon, minLat, maxLon, maxLat, s.minLon, s.minLat, s.maxLon, s.maxLat)
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}
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func (s *GeoBoundingBoxSearcher) cellIntersectShape(minLon, minLat, maxLon, maxLat float64) bool {
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return s.cellIntersectsMBR(minLon, minLat, maxLon, maxLat)
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}
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func (s *GeoBoundingBoxSearcher) cellIntersectsMBR(minLon, minLat, maxLon, maxLat float64) bool {
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return geo.RectIntersects(minLon, minLat, maxLon, maxLat, s.minLon, s.minLat, s.maxLon, s.maxLat)
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}
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type geoRange struct {
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cell []byte
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level uint
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boundary bool
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}
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func newGeoRange(lower uint64, res uint, level uint, boundary bool) *geoRange {
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return &geoRange{
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level: level,
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boundary: boundary,
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cell: numeric.MustNewPrefixCodedInt64(int64(lower), res),
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}
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}
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func (r *geoRange) Compare(other *geoRange) int {
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return bytes.Compare(r.cell, other.cell)
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}
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