/
index_geo2d.cpp
1675 lines (1348 loc) · 52.8 KB
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index_geo2d.cpp
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// geo2d.cpp
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "stdafx.h"
#include "namespace.h"
#include "jsobj.h"
#include "index.h"
#include "../util/unittest.h"
#include "commands.h"
#include "pdfile.h"
#include "btree.h"
#include "curop.h"
#include "matcher.h"
//#define GEODEBUG(x) cout << x << endl;
#define GEODEBUG(x)
namespace mongo {
const string GEO2DNAME = "2d";
class GeoBitSets {
public:
GeoBitSets(){
for ( int i=0; i<32; i++ ){
masks32[i] = ( 1 << ( 31 - i ) );
}
for ( int i=0; i<64; i++ ){
masks64[i] = ( 1LL << ( 63 - i ) );
}
}
int masks32[32];
long long masks64[64];
} geoBitSets;
class GeoHash {
public:
GeoHash()
: _hash(0),_bits(0){
}
GeoHash( const char * hash ){
init( hash );
}
GeoHash( const string& hash ){
init( hash );
}
GeoHash( const BSONElement& e , unsigned bits=32 ){
_bits = bits;
if ( e.type() == BinData ){
int len = 0;
_copy( (char*)&_hash , e.binData( len ) );
assert( len == 8 );
_bits = bits;
}
else {
cout << "GeoHash cons e : " << e << endl;
uassert(13047,"wrong type for geo index. if you're using a pre-release version, need to rebuild index",0);
}
_fix();
}
GeoHash( unsigned x , unsigned y , unsigned bits=32){
init( x , y , bits );
}
GeoHash( const GeoHash& old ){
_hash = old._hash;
_bits = old._bits;
}
GeoHash( long long hash , unsigned bits )
: _hash( hash ) , _bits( bits ){
_fix();
}
void init( unsigned x , unsigned y , unsigned bits ){
assert( bits <= 32 );
_hash = 0;
_bits = bits;
for ( unsigned i=0; i<bits; i++ ){
if ( isBitSet( x , i ) ) _hash |= geoBitSets.masks64[i*2];
if ( isBitSet( y , i ) ) _hash |= geoBitSets.masks64[(i*2)+1];
}
}
void unhash( unsigned& x , unsigned& y ) const {
x = 0;
y = 0;
for ( unsigned i=0; i<_bits; i++ ){
if ( getBitX(i) )
x |= geoBitSets.masks32[i];
if ( getBitY(i) )
y |= geoBitSets.masks32[i];
}
}
/**
* @param 0 = high
*/
static bool isBitSet( unsigned val , unsigned bit ){
return geoBitSets.masks32[bit] & val;
}
GeoHash up() const {
return GeoHash( _hash , _bits - 1 );
}
bool hasPrefix( const GeoHash& other ) const {
assert( other._bits <= _bits );
if ( other._bits == 0 )
return true;
long long x = other._hash ^ _hash;
x = x >> (64-(other._bits*2));
return x == 0;
}
string toString() const {
StringBuilder buf( _bits * 2 );
for ( unsigned x=0; x<_bits*2; x++ )
buf.append( _hash & geoBitSets.masks64[x] ? "1" : "0" );
return buf.str();
}
string toStringHex1() const {
stringstream ss;
ss << hex << _hash;
return ss.str();
}
void init( const string& s ){
_hash = 0;
_bits = s.size() / 2;
for ( unsigned pos=0; pos<s.size(); pos++ )
if ( s[pos] == '1' )
setBit( pos , 1 );
}
void setBit( unsigned pos , bool one ){
assert( pos < _bits * 2 );
if ( one )
_hash |= geoBitSets.masks64[pos];
else if ( _hash & geoBitSets.masks64[pos] )
_hash &= ~geoBitSets.masks64[pos];
}
bool getBit( unsigned pos ) const {
return _hash & geoBitSets.masks64[pos];
}
bool getBitX( unsigned pos ) const {
assert( pos < 32 );
return getBit( pos * 2 );
}
bool getBitY( unsigned pos ) const {
assert( pos < 32 );
return getBit( ( pos * 2 ) + 1 );
}
BSONObj wrap() const {
BSONObjBuilder b(20);
append( b , "" );
BSONObj o = b.obj();
assert( o.objsize() == 20 );
return o;
}
bool constrains() const {
return _bits > 0;
}
void move( int x , int y ){
assert( _bits );
_move( 0 , x );
_move( 1 , y );
}
void _move( unsigned offset , int d ){
if ( d == 0 )
return;
assert( d <= 1 && d>= -1 ); // TEMP
bool from, to;
if ( d > 0 ){
from = 0;
to = 1;
}
else {
from = 1;
to = 0;
}
unsigned pos = ( _bits * 2 ) - 1;
if ( offset == 0 )
pos--;
while ( true ){
if ( getBit(pos) == from ){
setBit( pos , to );
return;
}
if ( pos < 2 ){
// overflow
for ( ; pos < ( _bits * 2 ) ; pos += 2 ){
setBit( pos , from );
}
return;
}
setBit( pos , from );
pos -= 2;
}
assert(0);
}
GeoHash& operator=(const GeoHash& h) {
_hash = h._hash;
_bits = h._bits;
return *this;
}
bool operator==(const GeoHash& h ){
return _hash == h._hash && _bits == h._bits;
}
GeoHash& operator+=( const char * s ) {
unsigned pos = _bits * 2;
_bits += strlen(s) / 2;
assert( _bits <= 32 );
while ( s[0] ){
if ( s[0] == '1' )
setBit( pos , 1 );
pos++;
s++;
}
return *this;
}
GeoHash operator+( const char * s ) const {
GeoHash n = *this;
n+=s;
return n;
}
void _fix(){
if ( ( _hash << ( _bits * 2 ) ) == 0 )
return;
long long mask = 0;
for ( unsigned i=0; i<_bits*2; i++ )
mask |= geoBitSets.masks64[i];
_hash &= mask;
}
void append( BSONObjBuilder& b , const char * name ) const {
char buf[8];
_copy( buf , (char*)&_hash );
b.appendBinData( name , 8 , bdtCustom , buf );
}
long long getHash() const {
return _hash;
}
GeoHash commonPrefix( const GeoHash& other ) const {
unsigned i=0;
for ( ; i<_bits && i<other._bits; i++ ){
if ( getBitX( i ) == other.getBitX( i ) &&
getBitY( i ) == other.getBitY( i ) )
continue;
break;
}
return GeoHash(_hash,i);
}
private:
void _copy( char * dst , const char * src ) const {
for ( unsigned a=0; a<8; a++ ){
dst[a] = src[7-a];
}
}
long long _hash;
unsigned _bits; // bits per field, so 1 to 32
};
ostream& operator<<( ostream &s, const GeoHash &h ){
s << h.toString();
return s;
} // end GeoHash
class Geo2dType : public IndexType {
public:
Geo2dType( const IndexPlugin * plugin , const IndexSpec* spec )
: IndexType( plugin , spec ){
BSONObjBuilder orderBuilder;
BSONObjIterator i( spec->keyPattern );
while ( i.more() ){
BSONElement e = i.next();
if ( e.type() == String && GEO2DNAME == e.valuestr() ){
uassert( 13022 , "can't have 2 geo field" , _geo.size() == 0 );
uassert( 13023 , "2d has to be first in index" , _other.size() == 0 );
_geo = e.fieldName();
}
else {
_other.push_back( e.fieldName() );
}
orderBuilder.append( "" , 1 );
}
uassert( 13024 , "no geo field specified" , _geo.size() );
_bits = _configval( spec , "bits" , 26 ); // for lat/long, ~ 1ft
uassert( 13028 , "can't have more than 32 bits in geo index" , _bits <= 32 );
_max = _configval( spec , "max" , 180 );
_min = _configval( spec , "min" , -180 );
_scaling = (1024*1024*1024*4.0)/(_max-_min);
_order = orderBuilder.obj();
}
int _configval( const IndexSpec* spec , const string& name , int def ){
BSONElement e = spec->info[name];
if ( e.isNumber() )
return e.numberInt();
return def;
}
~Geo2dType(){
}
virtual BSONObj fixKey( const BSONObj& in ) {
if ( in.firstElement().type() == BinData )
return in;
BSONObjBuilder b(in.objsize()+16);
if ( in.firstElement().isABSONObj() )
_hash( in.firstElement().embeddedObject() ).append( b , "" );
else if ( in.firstElement().type() == String )
GeoHash( in.firstElement().valuestr() ).append( b , "" );
else if ( in.firstElement().type() == RegEx )
GeoHash( in.firstElement().regex() ).append( b , "" );
else
return in;
BSONObjIterator i(in);
i.next();
while ( i.more() )
b.append( i.next() );
return b.obj();
}
virtual void getKeys( const BSONObj &obj, BSONObjSetDefaultOrder &keys ) const {
BSONElement geo = obj.getFieldDotted(_geo.c_str());
if ( geo.eoo() )
return;
BSONObjBuilder b(64);
if ( ! geo.isABSONObj() )
return;
BSONObj embed = geo.embeddedObject();
if ( embed.isEmpty() )
return;
_hash( embed ).append( b , "" );
for ( size_t i=0; i<_other.size(); i++ ){
BSONElement e = obj[_other[i]];
if ( e.eoo() )
e = _spec->missingField();
b.appendAs( e , "" );
}
keys.insert( b.obj() );
}
GeoHash _tohash( const BSONElement& e ) const {
if ( e.isABSONObj() )
return _hash( e.embeddedObject() );
return GeoHash( e , _bits );
}
GeoHash _hash( const BSONObj& o ) const {
BSONObjIterator i(o);
uassert( 13067 , "geo field is empty" , i.more() );
BSONElement x = i.next();
uassert( 13068 , "geo field only has 1 element" , i.more() );
BSONElement y = i.next();
uassert( 13026 , "geo values have to be numbers" , x.isNumber() && y.isNumber() );
return _hash( x.number() , y.number() );
}
GeoHash _hash( double x , double y ) const {
return GeoHash( _convert(x), _convert(y) , _bits );
}
BSONObj _unhash( const GeoHash& h ) const {
unsigned x , y;
h.unhash( x , y );
BSONObjBuilder b;
b.append( "x" , _unconvert( x ) );
b.append( "y" , _unconvert( y ) );
return b.obj();
}
unsigned _convert( double in ) const {
uassert( 13027 , "point not in range" , in <= _max && in >= _min );
in -= _min;
assert( in > 0 );
return (unsigned)(in * _scaling);
}
double _unconvert( unsigned in ) const {
double x = in;
x /= _scaling;
x += _min;
return x;
}
void _unconvert( const GeoHash& h , double& x , double& y ) const {
unsigned a,b;
h.unhash(a,b);
x = _unconvert( a );
y = _unconvert( b );
}
double distance( const GeoHash& a , const GeoHash& b ) const {
double ax,ay,bx,by;
_unconvert( a , ax , ay );
_unconvert( b , bx , by );
double dx = bx - ax;
double dy = by - ay;
return sqrt( ( dx * dx ) + ( dy * dy ) );
}
double size( const GeoHash& a ) const {
GeoHash b = a;
b.move( 1 , 1 );
return distance( a , b );
}
const IndexDetails* getDetails() const {
return _spec->getDetails();
}
virtual auto_ptr<Cursor> newCursor( const BSONObj& query , const BSONObj& order , int numWanted ) const;
virtual IndexSuitability suitability( const BSONObj& query , const BSONObj& order ) const {
BSONElement e = query.getFieldDotted(_geo.c_str());
switch ( e.type() ){
case Object: {
BSONObj sub = e.embeddedObject();
switch ( sub.firstElement().getGtLtOp() ){
case BSONObj::opNEAR:
case BSONObj::opWITHIN:
return OPTIMAL;
default:;
}
}
case Array:
return HELPFUL;
default:
return USELESS;
}
}
string _geo;
vector<string> _other;
unsigned _bits;
int _max;
int _min;
double _scaling;
BSONObj _order;
};
class Point {
public:
Point( const Geo2dType * g , const GeoHash& hash ){
g->_unconvert( hash , _x , _y );
}
Point( double x , double y )
: _x( x ) , _y( y ){
}
Point() : _x(0),_y(0){
}
GeoHash hash( const Geo2dType * g ){
return g->_hash( _x , _y );
}
string toString() const {
StringBuilder buf(32);
buf << "(" << _x << "," << _y << ")";
return buf.str();
}
double _x;
double _y;
};
class Box {
public:
Box( const Geo2dType * g , const GeoHash& hash )
: _min( g , hash ) ,
_max( _min._x + g->size( hash ) , _min._y + g->size( hash ) ){
}
Box( double x , double y , double size )
: _min( x , y ) ,
_max( x + size , y + size ){
}
Box( Point min , Point max )
: _min( min ) , _max( max ){
}
Box(){}
string toString() const {
StringBuilder buf(64);
buf << _min.toString() << " -->> " << _max.toString();
return buf.str();
}
operator string() const {
return toString();
}
bool between( double min , double max , double val , double fudge=0) const {
return val + fudge >= min && val <= max + fudge;
}
bool mid( double amin , double amax , double bmin , double bmax , bool min , double& res ) const {
assert( amin < amax );
assert( bmin < bmax );
if ( amin < bmin ){
if ( amax < bmin )
return false;
res = min ? bmin : amax;
return true;
}
if ( amin > bmax )
return false;
res = min ? amin : bmax;
return true;
}
double intersects( const Box& other ) const {
Point boundMin(0,0);
Point boundMax(0,0);
if ( mid( _min._x , _max._x , other._min._x , other._max._x , true , boundMin._x ) == false ||
mid( _min._x , _max._x , other._min._x , other._max._x , false , boundMax._x ) == false ||
mid( _min._y , _max._y , other._min._y , other._max._y , true , boundMin._y ) == false ||
mid( _min._y , _max._y , other._min._y , other._max._y , false , boundMax._y ) == false )
return 0;
Box intersection( boundMin , boundMax );
return intersection.area() / ( ( area() + other.area() ) / 2 );
}
double area() const {
return ( _max._x - _min._x ) * ( _max._y - _min._y );
}
Point center() const {
return Point( ( _min._x + _max._x ) / 2 ,
( _min._y + _max._y ) / 2 );
}
bool inside( Point p , double fudge = 0 ){
bool res = inside( p._x , p._y , fudge );
//cout << "is : " << p.toString() << " in " << toString() << " = " << res << endl;
return res;
}
bool inside( double x , double y , double fudge = 0 ){
return
between( _min._x , _max._x , x , fudge ) &&
between( _min._y , _max._y , y , fudge );
}
Point _min;
Point _max;
};
class Geo2dPlugin : public IndexPlugin {
public:
Geo2dPlugin() : IndexPlugin( GEO2DNAME ){
}
virtual IndexType* generate( const IndexSpec* spec ) const {
return new Geo2dType( this , spec );
}
} geo2dplugin;
struct GeoUnitTest : public UnitTest {
int round( double d ){
return (int)(.5+(d*1000));
}
#define GEOHEQ(a,b) if ( a.toString() != b ){ cout << "[" << a.toString() << "] != [" << b << "]" << endl; assert( a == b ); }
void run(){
assert( ! GeoHash::isBitSet( 0 , 0 ) );
assert( ! GeoHash::isBitSet( 0 , 31 ) );
assert( GeoHash::isBitSet( 1 , 31 ) );
IndexSpec i( BSON( "loc" << "2d" ) );
Geo2dType g( &geo2dplugin , &i );
{
double x = 73.01212;
double y = 41.352964;
BSONObj in = BSON( "x" << x << "y" << y );
GeoHash h = g._hash( in );
BSONObj out = g._unhash( h );
assert( round(x) == round( out["x"].number() ) );
assert( round(y) == round( out["y"].number() ) );
assert( round( in["x"].number() ) == round( out["x"].number() ) );
assert( round( in["y"].number() ) == round( out["y"].number() ) );
}
{
double x = -73.01212;
double y = 41.352964;
BSONObj in = BSON( "x" << x << "y" << y );
GeoHash h = g._hash( in );
BSONObj out = g._unhash( h );
assert( round(x) == round( out["x"].number() ) );
assert( round(y) == round( out["y"].number() ) );
assert( round( in["x"].number() ) == round( out["x"].number() ) );
assert( round( in["y"].number() ) == round( out["y"].number() ) );
}
{
GeoHash h( "0000" );
h.move( 0 , 1 );
GEOHEQ( h , "0001" );
h.move( 0 , -1 );
GEOHEQ( h , "0000" );
h.init( "0001" );
h.move( 0 , 1 );
GEOHEQ( h , "0100" );
h.move( 0 , -1 );
GEOHEQ( h , "0001" );
h.init( "0000" );
h.move( 1 , 0 );
GEOHEQ( h , "0010" );
}
{
Box b( 5 , 5 , 2 );
assert( "(5,5) -->> (7,7)" == b.toString() );
}
{
GeoHash a = g._hash( 1 , 1 );
GeoHash b = g._hash( 4 , 5 );
assert( 5 == (int)(g.distance( a , b ) ) );
a = g._hash( 50 , 50 );
b = g._hash( 42 , 44 );
assert( round(10) == round(g.distance( a , b )) );
}
{
GeoHash x("0000");
assert( 0 == x.getHash() );
x.init( 0 , 1 , 32 );
GEOHEQ( x , "0000000000000000000000000000000000000000000000000000000000000001" )
assert( GeoHash( "1100").hasPrefix( GeoHash( "11" ) ) );
assert( ! GeoHash( "1000").hasPrefix( GeoHash( "11" ) ) );
}
{
GeoHash x("1010");
GEOHEQ( x , "1010" );
GeoHash y = x + "01";
GEOHEQ( y , "101001" );
}
{
GeoHash a = g._hash( 5 , 5 );
GeoHash b = g._hash( 5 , 7 );
GeoHash c = g._hash( 100 , 100 );
/*
cout << "a: " << a << endl;
cout << "b: " << b << endl;
cout << "c: " << c << endl;
cout << "a: " << a.toStringHex1() << endl;
cout << "b: " << b.toStringHex1() << endl;
cout << "c: " << c.toStringHex1() << endl;
*/
BSONObj oa = a.wrap();
BSONObj ob = b.wrap();
BSONObj oc = c.wrap();
/*
cout << "a: " << oa.hexDump() << endl;
cout << "b: " << ob.hexDump() << endl;
cout << "c: " << oc.hexDump() << endl;
*/
assert( oa.woCompare( ob ) < 0 );
assert( oa.woCompare( oc ) < 0 );
}
{
GeoHash x( "000000" );
x.move( -1 , 0 );
GEOHEQ( x , "101010" );
x.move( 1 , -1 );
GEOHEQ( x , "010101" );
x.move( 0 , 1 );
GEOHEQ( x , "000000" );
}
{
GeoHash prefix( "110011000000" );
GeoHash entry( "1100110000011100000111000001110000011100000111000001000000000000" );
assert( ! entry.hasPrefix( prefix ) );
entry = "1100110000001100000111000001110000011100000111000001000000000000";
assert( entry.toString().find( prefix.toString() ) == 0 );
assert( entry.hasPrefix( GeoHash( "1100" ) ) );
assert( entry.hasPrefix( prefix ) );
}
{
GeoHash a = g._hash( 50 , 50 );
GeoHash b = g._hash( 48 , 54 );
assert( round( 4.47214 ) == round( g.distance( a , b ) ) );
}
{
Box b( Point( 29.762283 , -95.364271 ) , Point( 29.764283000000002 , -95.36227099999999 ) );
assert( b.inside( 29.763 , -95.363 ) );
assert( ! b.inside( 32.9570255 , -96.1082497 ) );
assert( ! b.inside( 32.9570255 , -96.1082497 , .01 ) );
}
{
GeoHash a( "11001111" );
assert( GeoHash( "11" ) == a.commonPrefix( "11" ) );
assert( GeoHash( "11" ) == a.commonPrefix( "11110000" ) );
}
}
} geoUnitTest;
class GeoPoint {
public:
GeoPoint(){
}
GeoPoint( const KeyNode& node , double distance )
: _key( node.key ) , _loc( node.recordLoc ) , _o( node.recordLoc.obj() ) , _distance( distance ){
}
GeoPoint( const BSONObj& key , DiskLoc loc , double distance )
: _key(key) , _loc(loc) , _o( loc.obj() ) , _distance( distance ){
}
bool operator<( const GeoPoint& other ) const {
return _distance < other._distance;
}
bool isEmpty() const {
return _o.isEmpty();
}
BSONObj _key;
DiskLoc _loc;
BSONObj _o;
double _distance;
};
class GeoAccumulator {
public:
GeoAccumulator( const Geo2dType * g , const BSONObj& filter )
: _g(g) , _lookedAt(0) , _objectsLoaded(0) , _found(0) {
if ( ! filter.isEmpty() ){
_matcher.reset( new CoveredIndexMatcher( filter , g->keyPattern() ) );
}
}
virtual ~GeoAccumulator(){
}
virtual void add( const KeyNode& node ){
// when looking at other boxes, don't want to look at some object twice
if ( _seen.count( node.recordLoc ) ){
GEODEBUG( "\t\t\t\t already seen : " << node.recordLoc.obj()["_id"] );
return;
}
_seen.insert( node.recordLoc );
_lookedAt++;
// distance check
double d = 0;
if ( ! checkDistance( GeoHash( node.key.firstElement() ) , d ) ){
GEODEBUG( "\t\t\t\t bad distance : " << node.recordLoc.obj() << "\t" << d );
return;
}
// matcher
MatchDetails details;
if ( _matcher.get() ){
bool good = _matcher->matches( node.key , node.recordLoc , &details );
if ( details.loadedObject )
_objectsLoaded++;
if ( ! good ){
GEODEBUG( "\t\t\t\t didn't match : " << node.recordLoc.obj()["_id"] );
return;
}
}
if ( ! details.loadedObject ) // dont double count
_objectsLoaded++;
addSpecific( node , d );
_found++;
}
virtual void addSpecific( const KeyNode& node , double d ) = 0;
virtual bool checkDistance( const GeoHash& node , double& d ) = 0;
long long found() const {
return _found;
}
const Geo2dType * _g;
set<DiskLoc> _seen;
auto_ptr<CoveredIndexMatcher> _matcher;
long long _lookedAt;
long long _objectsLoaded;
long long _found;
};
class GeoHopper : public GeoAccumulator {
public:
typedef multiset<GeoPoint> Holder;
GeoHopper( const Geo2dType * g , unsigned max , const GeoHash& n , const BSONObj& filter = BSONObj() )
: GeoAccumulator( g , filter ) , _max( max ) , _near( n ) {
}
virtual bool checkDistance( const GeoHash& h , double& d ){
d = _g->distance( _near , h );
bool good = _points.size() < _max || d < farthest();
GEODEBUG( "\t\t\t\t\t\t\t checkDistance " << _near << "\t" << h << "\t" << d
<< " ok: " << good << " farthest: " << farthest() );
return good;
}
virtual void addSpecific( const KeyNode& node , double d ){
GEODEBUG( "\t\t" << GeoHash( node.key.firstElement() ) << "\t" << node.recordLoc.obj() << "\t" << d );
_points.insert( GeoPoint( node.key , node.recordLoc , d ) );
if ( _points.size() > _max ){
_points.erase( --_points.end() );
}
}
double farthest(){
if ( _points.size() == 0 )
return -1;
Holder::iterator i = _points.end();
i--;
return i->_distance;
}
unsigned _max;
GeoHash _near;
Holder _points;
};
struct BtreeLocation {
int pos;
bool found;
DiskLoc bucket;
BSONObj key(){
if ( bucket.isNull() )
return BSONObj();
return bucket.btree()->keyNode( pos ).key;
}
bool hasPrefix( const GeoHash& hash ){
BSONElement e = key().firstElement();
if ( e.eoo() )
return false;
return GeoHash( e ).hasPrefix( hash );
}
bool advance( int direction , int& totalFound , GeoAccumulator* all ){
if ( bucket.isNull() )
return false;
bucket = bucket.btree()->advance( bucket , pos , direction , "btreelocation" );
return checkCur( totalFound , all );
}
bool checkCur( int& totalFound , GeoAccumulator* all ){
if ( bucket.isNull() )
return false;
if ( bucket.btree()->isUsed(pos) ){
totalFound++;
all->add( bucket.btree()->keyNode( pos ) );
}
else {
GEODEBUG( "\t\t\t\t not used: " << key() );
}
return true;
}
string toString(){
stringstream ss;
ss << "bucket: " << bucket.toString() << " pos: " << pos << " found: " << found;
return ss.str();
}
static bool initial( const IndexDetails& id , const Geo2dType * spec ,
BtreeLocation& min , BtreeLocation& max ,
GeoHash start ,
int & found , GeoAccumulator * hopper ){
min.bucket = id.head.btree()->locate( id , id.head , start.wrap() ,
spec->_order , min.pos , min.found , minDiskLoc );
min.checkCur( found , hopper );
max = min;
if ( min.bucket.isNull() ){
min.bucket = id.head.btree()->locate( id , id.head , start.wrap() ,
spec->_order , min.pos , min.found , minDiskLoc , -1 );
min.checkCur( found , hopper );
}
return ! min.bucket.isNull() || ! max.bucket.isNull();
}
};
class GeoSearch {