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queryutil.cpp
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queryutil.cpp
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// queryutil.cpp
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "pch.h"
#include "btree.h"
#include "matcher.h"
#include "pdfile.h"
#include "queryoptimizer.h"
#include "../util/unittest.h"
#include "dbmessage.h"
namespace mongo {
extern BSONObj staticNull;
/** returns a string that when used as a matcher, would match a super set of regex()
returns "" for complex regular expressions
used to optimize queries in some simple regex cases that start with '^'
if purePrefix != NULL, sets it to whether the regex can be converted to a range query
*/
string simpleRegex(const char* regex, const char* flags, bool* purePrefix){
string r = "";
if (purePrefix) *purePrefix = false;
bool multilineOK;
if ( regex[0] == '\\' && regex[1] == 'A'){
multilineOK = true;
regex += 2;
} else if (regex[0] == '^') {
multilineOK = false;
regex += 1;
} else {
return r;
}
bool extended = false;
while (*flags){
switch (*(flags++)){
case 'm': // multiline
if (multilineOK)
continue;
else
return r;
case 'x': // extended
extended = true;
break;
default:
return r; // cant use index
}
}
stringstream ss;
while(*regex){
char c = *(regex++);
if ( c == '*' || c == '?' ){
// These are the only two symbols that make the last char optional
r = ss.str();
r = r.substr( 0 , r.size() - 1 );
return r; //breaking here fails with /^a?/
} else if (c == '\\'){
// slash followed by non-alphanumeric represents the following char
c = *(regex++);
if ((c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') ||
(c >= '0' && c <= '0') ||
(c == '\0'))
{
r = ss.str();
break;
} else {
ss << c;
}
} else if (strchr("^$.[|()+{", c)){
// list of "metacharacters" from man pcrepattern
r = ss.str();
break;
} else if (extended && c == '#'){
// comment
r = ss.str();
break;
} else if (extended && isspace(c)){
continue;
} else {
// self-matching char
ss << c;
}
}
if ( r.empty() && *regex == 0 ){
r = ss.str();
if (purePrefix) *purePrefix = !r.empty();
}
return r;
}
inline string simpleRegex(const BSONElement& e){
switch(e.type()){
case RegEx:
return simpleRegex(e.regex(), e.regexFlags());
case Object:{
BSONObj o = e.embeddedObject();
return simpleRegex(o["$regex"].valuestrsafe(), o["$options"].valuestrsafe());
}
default: assert(false); return ""; //return squashes compiler warning
}
}
string simpleRegexEnd( string regex ) {
++regex[ regex.length() - 1 ];
return regex;
}
FieldRange::FieldRange( const BSONElement &e, bool isNot, bool optimize ) {
// NOTE with $not, we could potentially form a complementary set of intervals.
if ( !isNot && !e.eoo() && e.type() != RegEx && e.getGtLtOp() == BSONObj::opIN ) {
set< BSONElement, element_lt > vals;
vector< FieldRange > regexes;
uassert( 12580 , "invalid query" , e.isABSONObj() );
BSONObjIterator i( e.embeddedObject() );
while( i.more() ) {
BSONElement ie = i.next();
if ( ie.type() == RegEx ) {
regexes.push_back( FieldRange( ie, false, optimize ) );
} else {
vals.insert( ie );
}
}
for( set< BSONElement, element_lt >::const_iterator i = vals.begin(); i != vals.end(); ++i )
_intervals.push_back( FieldInterval(*i) );
for( vector< FieldRange >::const_iterator i = regexes.begin(); i != regexes.end(); ++i )
*this |= *i;
return;
}
if ( e.type() == Array && e.getGtLtOp() == BSONObj::Equality ){
_intervals.push_back( FieldInterval(e) );
const BSONElement& temp = e.embeddedObject().firstElement();
if ( ! temp.eoo() ){
if ( temp < e )
_intervals.insert( _intervals.begin() , temp );
else
_intervals.push_back( FieldInterval(temp) );
}
return;
}
_intervals.push_back( FieldInterval() );
FieldInterval &initial = _intervals[ 0 ];
BSONElement &lower = initial._lower._bound;
bool &lowerInclusive = initial._lower._inclusive;
BSONElement &upper = initial._upper._bound;
bool &upperInclusive = initial._upper._inclusive;
lower = minKey.firstElement();
lowerInclusive = true;
upper = maxKey.firstElement();
upperInclusive = true;
if ( e.eoo() )
return;
if ( e.type() == RegEx
|| (e.type() == Object && !e.embeddedObject()["$regex"].eoo())
)
{
if ( !isNot ) { // no optimization for negated regex - we could consider creating 2 intervals comprising all nonmatching prefixes
const string r = simpleRegex(e);
if ( r.size() ) {
lower = addObj( BSON( "" << r ) ).firstElement();
upper = addObj( BSON( "" << simpleRegexEnd( r ) ) ).firstElement();
upperInclusive = false;
} else {
BSONObjBuilder b1(32), b2(32);
b1.appendMinForType( "" , String );
lower = addObj( b1.obj() ).firstElement();
b2.appendMaxForType( "" , String );
upper = addObj( b2.obj() ).firstElement();
upperInclusive = false; //MaxForType String is an empty Object
}
// regex matches self - regex type > string type
if (e.type() == RegEx){
BSONElement re = addObj( BSON( "" << e ) ).firstElement();
_intervals.push_back( FieldInterval(re) );
} else {
BSONObj orig = e.embeddedObject();
BSONObjBuilder b;
b.appendRegex("", orig["$regex"].valuestrsafe(), orig["$options"].valuestrsafe());
BSONElement re = addObj( b.obj() ).firstElement();
_intervals.push_back( FieldInterval(re) );
}
}
return;
}
int op = e.getGtLtOp();
if ( isNot ) {
switch( op ) {
case BSONObj::Equality:
case BSONObj::opALL:
case BSONObj::opMOD: // NOTE for mod and type, we could consider having 1-2 intervals comprising the complementary types (multiple intervals already possible with $in)
case BSONObj::opTYPE:
op = BSONObj::NE; // no bound calculation
break;
case BSONObj::NE:
op = BSONObj::Equality;
break;
case BSONObj::LT:
op = BSONObj::GTE;
break;
case BSONObj::LTE:
op = BSONObj::GT;
break;
case BSONObj::GT:
op = BSONObj::LTE;
break;
case BSONObj::GTE:
op = BSONObj::LT;
break;
default: // otherwise doesn't matter
break;
}
}
switch( op ) {
case BSONObj::Equality:
lower = upper = e;
break;
case BSONObj::LT:
upperInclusive = false;
case BSONObj::LTE:
upper = e;
break;
case BSONObj::GT:
lowerInclusive = false;
case BSONObj::GTE:
lower = e;
break;
case BSONObj::opALL: {
massert( 10370 , "$all requires array", e.type() == Array );
BSONObjIterator i( e.embeddedObject() );
bool bound = false;
while ( i.more() ){
BSONElement x = i.next();
if ( x.type() == Object && x.embeddedObject().firstElement().getGtLtOp() == BSONObj::opELEM_MATCH ){
// taken care of elsewhere
}
else if ( x.type() != RegEx ) {
lower = upper = x;
bound = true;
break;
}
}
if ( !bound ) { // if no good non regex bound found, try regex bounds
BSONObjIterator i( e.embeddedObject() );
while( i.more() ) {
BSONElement x = i.next();
if ( x.type() != RegEx )
continue;
string simple = simpleRegex( x.regex(), x.regexFlags() );
if ( !simple.empty() ) {
lower = addObj( BSON( "" << simple ) ).firstElement();
upper = addObj( BSON( "" << simpleRegexEnd( simple ) ) ).firstElement();
break;
}
}
}
break;
}
case BSONObj::opMOD: {
{
BSONObjBuilder b;
b.appendMinForType( "" , NumberDouble );
lower = addObj( b.obj() ).firstElement();
}
{
BSONObjBuilder b;
b.appendMaxForType( "" , NumberDouble );
upper = addObj( b.obj() ).firstElement();
}
break;
}
case BSONObj::opTYPE: {
BSONType t = (BSONType)e.numberInt();
{
BSONObjBuilder b;
b.appendMinForType( "" , t );
lower = addObj( b.obj() ).firstElement();
}
{
BSONObjBuilder b;
b.appendMaxForType( "" , t );
upper = addObj( b.obj() ).firstElement();
}
break;
}
case BSONObj::opREGEX:
case BSONObj::opOPTIONS:
// do nothing
break;
case BSONObj::opELEM_MATCH: {
log() << "warning: shouldn't get here?" << endl;
break;
}
case BSONObj::opNEAR:
case BSONObj::opWITHIN:
_special = "2d";
break;
default:
break;
}
if ( optimize ){
if ( lower.type() != MinKey && upper.type() == MaxKey && lower.isSimpleType() ){ // TODO: get rid of isSimpleType
BSONObjBuilder b;
b.appendMaxForType( lower.fieldName() , lower.type() );
upper = addObj( b.obj() ).firstElement();
}
else if ( lower.type() == MinKey && upper.type() != MaxKey && upper.isSimpleType() ){ // TODO: get rid of isSimpleType
BSONObjBuilder b;
b.appendMinForType( upper.fieldName() , upper.type() );
lower = addObj( b.obj() ).firstElement();
}
}
}
void FieldRange::finishOperation( const vector< FieldInterval > &newIntervals, const FieldRange &other ) {
_intervals = newIntervals;
for( vector< BSONObj >::const_iterator i = other._objData.begin(); i != other._objData.end(); ++i )
_objData.push_back( *i );
if ( _special.size() == 0 && other._special.size() )
_special = other._special;
}
// as called, these functions find the max/min of a bound in the
// opposite direction, so inclusive bounds are considered less
// superlative
FieldBound maxFieldBound( const FieldBound &a, const FieldBound &b ) {
int cmp = a._bound.woCompare( b._bound, false );
if ( ( cmp == 0 && !b._inclusive ) || cmp < 0 )
return b;
return a;
}
FieldBound minFieldBound( const FieldBound &a, const FieldBound &b ) {
int cmp = a._bound.woCompare( b._bound, false );
if ( ( cmp == 0 && !b._inclusive ) || cmp > 0 )
return b;
return a;
}
bool fieldIntervalOverlap( const FieldInterval &one, const FieldInterval &two, FieldInterval &result ) {
result._lower = maxFieldBound( one._lower, two._lower );
result._upper = minFieldBound( one._upper, two._upper );
return result.strictValid();
}
// NOTE Not yet tested for complex $or bounds, just for simple bounds generated by $in
const FieldRange &FieldRange::operator&=( const FieldRange &other ) {
vector< FieldInterval > newIntervals;
vector< FieldInterval >::const_iterator i = _intervals.begin();
vector< FieldInterval >::const_iterator j = other._intervals.begin();
while( i != _intervals.end() && j != other._intervals.end() ) {
FieldInterval overlap;
if ( fieldIntervalOverlap( *i, *j, overlap ) )
newIntervals.push_back( overlap );
if ( i->_upper == minFieldBound( i->_upper, j->_upper ) )
++i;
else
++j;
}
finishOperation( newIntervals, other );
return *this;
}
void handleInterval( const FieldInterval &lower, FieldBound &low, FieldBound &high, vector< FieldInterval > &newIntervals ) {
if ( low._bound.eoo() ) {
low = lower._lower; high = lower._upper;
} else {
if ( high._bound.woCompare( lower._lower._bound, false ) < 0 ) { // when equal but neither inclusive, just assume they overlap, since current btree scanning code just as efficient either way
FieldInterval tmp;
tmp._lower = low;
tmp._upper = high;
newIntervals.push_back( tmp );
low = lower._lower; high = lower._upper;
} else {
high = lower._upper;
}
}
}
const FieldRange &FieldRange::operator|=( const FieldRange &other ) {
vector< FieldInterval > newIntervals;
FieldBound low;
FieldBound high;
vector< FieldInterval >::const_iterator i = _intervals.begin();
vector< FieldInterval >::const_iterator j = other._intervals.begin();
while( i != _intervals.end() && j != other._intervals.end() ) {
int cmp = i->_lower._bound.woCompare( j->_lower._bound, false );
if ( ( cmp == 0 && i->_lower._inclusive ) || cmp < 0 ) {
handleInterval( *i, low, high, newIntervals );
++i;
} else {
handleInterval( *j, low, high, newIntervals );
++j;
}
}
while( i != _intervals.end() ) {
handleInterval( *i, low, high, newIntervals );
++i;
}
while( j != other._intervals.end() ) {
handleInterval( *j, low, high, newIntervals );
++j;
}
FieldInterval tmp;
tmp._lower = low;
tmp._upper = high;
newIntervals.push_back( tmp );
finishOperation( newIntervals, other );
return *this;
}
const FieldRange &FieldRange::operator-=( const FieldRange &other ) {
vector< FieldInterval >::iterator i = _intervals.begin();
vector< FieldInterval >::const_iterator j = other._intervals.begin();
while( i != _intervals.end() && j != other._intervals.end() ) {
int cmp = i->_lower._bound.woCompare( j->_lower._bound, false );
if ( cmp < 0 ||
( cmp == 0 && i->_lower._inclusive && !j->_lower._inclusive ) ) {
int cmp2 = i->_upper._bound.woCompare( j->_lower._bound, false );
if ( cmp2 < 0 ) {
++i;
} else if ( cmp2 == 0 ) {
if ( i->_upper._inclusive && j->_lower._inclusive ) {
i->_upper._inclusive = false;
}
++i;
} else {
int cmp3 = i->_upper._bound.woCompare( j->_upper._bound, false );
if ( cmp3 < 0 ||
( cmp3 == 0 && ( !i->_upper._inclusive || j->_upper._inclusive ) ) ) {
i->_upper = j->_lower;
i->_upper.flipInclusive();
++i;
} else {
++j;
}
}
} else {
int cmp2 = i->_lower._bound.woCompare( j->_upper._bound, false );
if ( cmp2 > 0 ||
( cmp2 == 0 && ( !i->_lower._inclusive || !j->_lower._inclusive ) ) ) {
++j;
} else {
int cmp3 = i->_upper._bound.woCompare( j->_upper._bound, false );
if ( cmp3 < 0 ||
( cmp3 == 0 && ( !i->_upper._inclusive || j->_upper._inclusive ) ) ) {
i = _intervals.erase( i );
} else {
i->_lower = j->_upper;
i->_lower.flipInclusive();
++j;
}
}
}
}
finishOperation( _intervals, other );
return *this;
}
// TODO write a proper implementation that doesn't do a full copy
bool FieldRange::operator<=( const FieldRange &other ) {
FieldRange temp = *this;
temp -= other;
return temp.empty();
}
BSONObj FieldRange::addObj( const BSONObj &o ) {
_objData.push_back( o );
return o;
}
string FieldRangeSet::getSpecial() const {
string s = "";
for ( map<string,FieldRange>::iterator i=_ranges.begin(); i!=_ranges.end(); i++ ){
if ( i->second.getSpecial().size() == 0 )
continue;
uassert( 13033 , "can't have 2 special fields" , s.size() == 0 );
s = i->second.getSpecial();
}
return s;
}
void FieldRangeSet::processOpElement( const char *fieldName, const BSONElement &f, bool isNot, bool optimize ) {
BSONElement g = f;
int op2 = g.getGtLtOp();
if ( op2 == BSONObj::opALL ) {
BSONElement h = g;
massert( 13050 , "$all requires array", h.type() == Array );
BSONObjIterator i( h.embeddedObject() );
if( i.more() ) {
BSONElement x = i.next();
if ( x.type() == Object && x.embeddedObject().firstElement().getGtLtOp() == BSONObj::opELEM_MATCH ) {
g = x.embeddedObject().firstElement();
op2 = g.getGtLtOp();
}
}
}
if ( op2 == BSONObj::opELEM_MATCH ) {
BSONObjIterator k( g.embeddedObjectUserCheck() );
while ( k.more() ){
BSONElement h = k.next();
StringBuilder buf(32);
buf << fieldName << "." << h.fieldName();
string fullname = buf.str();
int op3 = getGtLtOp( h );
if ( op3 == BSONObj::Equality ){
_ranges[ fullname ] &= FieldRange( h , isNot , optimize );
}
else {
BSONObjIterator l( h.embeddedObject() );
while ( l.more() ){
_ranges[ fullname ] &= FieldRange( l.next() , isNot , optimize );
}
}
}
} else {
_ranges[ fieldName ] &= FieldRange( f , isNot , optimize );
}
}
void FieldRangeSet::processQueryField( const BSONElement &e, bool optimize ) {
bool equality = ( getGtLtOp( e ) == BSONObj::Equality );
if ( equality && e.type() == Object ) {
equality = ( strcmp( e.embeddedObject().firstElement().fieldName(), "$not" ) != 0 );
}
if ( equality || ( e.type() == Object && !e.embeddedObject()[ "$regex" ].eoo() ) ) {
_ranges[ e.fieldName() ] &= FieldRange( e , false , optimize );
}
if ( !equality ) {
BSONObjIterator j( e.embeddedObject() );
while( j.more() ) {
BSONElement f = j.next();
if ( strcmp( f.fieldName(), "$not" ) == 0 ) {
switch( f.type() ) {
case Object: {
BSONObjIterator k( f.embeddedObject() );
while( k.more() ) {
BSONElement g = k.next();
uassert( 13034, "invalid use of $not", g.getGtLtOp() != BSONObj::Equality );
processOpElement( e.fieldName(), g, true, optimize );
}
break;
}
case RegEx:
processOpElement( e.fieldName(), f, true, optimize );
break;
default:
uassert( 13041, "invalid use of $not", false );
}
} else {
processOpElement( e.fieldName(), f, false, optimize );
}
}
}
}
FieldRangeSet::FieldRangeSet( const char *ns, const BSONObj &query , bool optimize )
: _ns( ns ), _queries( 1, query.getOwned() ) {
BSONObjIterator i( _queries[ 0 ] );
while( i.more() ) {
BSONElement e = i.next();
// e could be x:1 or x:{$gt:1}
if ( strcmp( e.fieldName(), "$where" ) == 0 ) {
continue;
}
if ( strcmp( e.fieldName(), "$or" ) == 0 ) {
continue;
}
if ( strcmp( e.fieldName(), "$nor" ) == 0 ) {
continue;
}
processQueryField( e, optimize );
}
}
FieldRangeOrSet::FieldRangeOrSet( const char *ns, const BSONObj &query , bool optimize )
: _baseSet( ns, query, optimize ), _orFound() {
BSONObjIterator i( _baseSet._queries[ 0 ] );
while( i.more() ) {
BSONElement e = i.next();
if ( strcmp( e.fieldName(), "$or" ) == 0 ) {
massert( 13262, "$or requires nonempty array", e.type() == Array && e.embeddedObject().nFields() > 0 );
BSONObjIterator j( e.embeddedObject() );
while( j.more() ) {
BSONElement f = j.next();
massert( 13263, "$or array must contain objects", f.type() == Object );
_orSets.push_back( FieldRangeSet( ns, f.embeddedObject(), optimize ) );
massert( 13291, "$or may not contain 'special' query", _orSets.back().getSpecial().empty() );
}
_orFound = true;
continue;
}
}
}
FieldRange *FieldRangeSet::trivialRange_ = 0;
FieldRange &FieldRangeSet::trivialRange() {
if ( trivialRange_ == 0 )
trivialRange_ = new FieldRange();
return *trivialRange_;
}
BSONObj FieldRangeSet::simplifiedQuery( const BSONObj &_fields ) const {
BSONObj fields = _fields;
if ( fields.isEmpty() ) {
BSONObjBuilder b;
for( map< string, FieldRange >::const_iterator i = _ranges.begin(); i != _ranges.end(); ++i ) {
b.append( i->first, 1 );
}
fields = b.obj();
}
BSONObjBuilder b;
BSONObjIterator i( fields );
while( i.more() ) {
BSONElement e = i.next();
const char *name = e.fieldName();
const FieldRange &range = _ranges[ name ];
assert( !range.empty() );
if ( range.equality() )
b.appendAs( range.min(), name );
else if ( range.nontrivial() ) {
BSONObj o;
BSONObjBuilder c;
if ( range.min().type() != MinKey )
c.appendAs( range.min(), range.minInclusive() ? "$gte" : "$gt" );
if ( range.max().type() != MaxKey )
c.appendAs( range.max(), range.maxInclusive() ? "$lte" : "$lt" );
o = c.obj();
b.append( name, o );
}
}
return b.obj();
}
QueryPattern FieldRangeSet::pattern( const BSONObj &sort ) const {
QueryPattern qp;
for( map< string, FieldRange >::const_iterator i = _ranges.begin(); i != _ranges.end(); ++i ) {
assert( !i->second.empty() );
if ( i->second.equality() ) {
qp._fieldTypes[ i->first ] = QueryPattern::Equality;
} else if ( i->second.nontrivial() ) {
bool upper = i->second.max().type() != MaxKey;
bool lower = i->second.min().type() != MinKey;
if ( upper && lower )
qp._fieldTypes[ i->first ] = QueryPattern::UpperAndLowerBound;
else if ( upper )
qp._fieldTypes[ i->first ] = QueryPattern::UpperBound;
else if ( lower )
qp._fieldTypes[ i->first ] = QueryPattern::LowerBound;
}
}
qp.setSort( sort );
return qp;
}
// TODO get rid of this
BoundList FieldRangeSet::indexBounds( const BSONObj &keyPattern, int direction ) const {
typedef vector< pair< shared_ptr< BSONObjBuilder >, shared_ptr< BSONObjBuilder > > > BoundBuilders;
BoundBuilders builders;
builders.push_back( make_pair( shared_ptr< BSONObjBuilder >( new BSONObjBuilder() ), shared_ptr< BSONObjBuilder >( new BSONObjBuilder() ) ) );
BSONObjIterator i( keyPattern );
bool ineq = false; // until ineq is true, we are just dealing with equality and $in bounds
while( i.more() ) {
BSONElement e = i.next();
const FieldRange &fr = range( e.fieldName() );
int number = (int) e.number(); // returns 0.0 if not numeric
bool forward = ( ( number >= 0 ? 1 : -1 ) * ( direction >= 0 ? 1 : -1 ) > 0 );
if ( !ineq ) {
if ( fr.equality() ) {
for( BoundBuilders::const_iterator j = builders.begin(); j != builders.end(); ++j ) {
j->first->appendAs( fr.min(), "" );
j->second->appendAs( fr.min(), "" );
}
} else {
if ( !fr.inQuery() ) {
ineq = true;
}
BoundBuilders newBuilders;
const vector< FieldInterval > &intervals = fr.intervals();
for( BoundBuilders::const_iterator i = builders.begin(); i != builders.end(); ++i ) {
BSONObj first = i->first->obj();
BSONObj second = i->second->obj();
if ( forward ) {
for( vector< FieldInterval >::const_iterator j = intervals.begin(); j != intervals.end(); ++j ) {
uassert( 13303, "combinatorial limit of $in partitioning of result set exceeded", newBuilders.size() < 1000000 );
newBuilders.push_back( make_pair( shared_ptr< BSONObjBuilder >( new BSONObjBuilder() ), shared_ptr< BSONObjBuilder >( new BSONObjBuilder() ) ) );
newBuilders.back().first->appendElements( first );
newBuilders.back().second->appendElements( second );
newBuilders.back().first->appendAs( j->_lower._bound, "" );
newBuilders.back().second->appendAs( j->_upper._bound, "" );
}
} else {
for( vector< FieldInterval >::const_reverse_iterator j = intervals.rbegin(); j != intervals.rend(); ++j ) {
uassert( 13304, "combinatorial limit of $in partitioning of result set exceeded", newBuilders.size() < 1000000 );
newBuilders.push_back( make_pair( shared_ptr< BSONObjBuilder >( new BSONObjBuilder() ), shared_ptr< BSONObjBuilder >( new BSONObjBuilder() ) ) );
newBuilders.back().first->appendElements( first );
newBuilders.back().second->appendElements( second );
newBuilders.back().first->appendAs( j->_upper._bound, "" );
newBuilders.back().second->appendAs( j->_lower._bound, "" );
}
}
}
builders = newBuilders;
}
} else {
for( BoundBuilders::const_iterator j = builders.begin(); j != builders.end(); ++j ) {
j->first->appendAs( forward ? fr.min() : fr.max(), "" );
j->second->appendAs( forward ? fr.max() : fr.min(), "" );
}
}
}
BoundList ret;
for( BoundBuilders::const_iterator i = builders.begin(); i != builders.end(); ++i )
ret.push_back( make_pair( i->first->obj(), i->second->obj() ) );
return ret;
}
///////////////////
// FieldMatcher //
///////////////////
void FieldMatcher::add( const BSONObj& o ){
massert( 10371 , "can only add to FieldMatcher once", _source.isEmpty());
_source = o;
BSONObjIterator i( o );
int true_false = -1;
while ( i.more() ){
BSONElement e = i.next();
if (e.type() == Object){
BSONObj obj = e.embeddedObject();
BSONElement e2 = obj.firstElement();
if ( strcmp(e2.fieldName(), "$slice") == 0 ){
if (e2.isNumber()){
int i = e2.numberInt();
if (i < 0)
add(e.fieldName(), i, -i); // limit is now positive
else
add(e.fieldName(), 0, i);
} else if (e2.type() == Array) {
BSONObj arr = e2.embeddedObject();
uassert(13099, "$slice array wrong size", arr.nFields() == 2 );
BSONObjIterator it(arr);
int skip = it.next().numberInt();
int limit = it.next().numberInt();
uassert(13100, "$slice limit must be positive", limit > 0 );
add(e.fieldName(), skip, limit);
} else {
uassert(13098, "$slice only supports numbers and [skip, limit] arrays", false);
}
} else {
uassert(13097, string("Unsupported projection option: ") + obj.firstElement().fieldName(), false);
}
} else if (!strcmp(e.fieldName(), "_id") && !e.trueValue()){
_includeID = false;
} else {
add (e.fieldName(), e.trueValue());
// validate input
if (true_false == -1){
true_false = e.trueValue();
_include = !e.trueValue();
}
else{
uassert( 10053 , "You cannot currently mix including and excluding fields. Contact us if this is an issue." ,
(bool)true_false == e.trueValue() );
}
}
}
}
void FieldMatcher::add(const string& field, bool include){
if (field.empty()){ // this is the field the user referred to
_include = include;
} else {
_include = !include;
const size_t dot = field.find('.');
const string subfield = field.substr(0,dot);
const string rest = (dot == string::npos ? "" : field.substr(dot+1,string::npos));
boost::shared_ptr<FieldMatcher>& fm = _fields[subfield];
if (!fm)
fm.reset(new FieldMatcher());
fm->add(rest, include);
}
}
void FieldMatcher::add(const string& field, int skip, int limit){
_special = true; // can't include or exclude whole object
if (field.empty()){ // this is the field the user referred to
_skip = skip;
_limit = limit;
} else {
const size_t dot = field.find('.');
const string subfield = field.substr(0,dot);
const string rest = (dot == string::npos ? "" : field.substr(dot+1,string::npos));
boost::shared_ptr<FieldMatcher>& fm = _fields[subfield];
if (!fm)
fm.reset(new FieldMatcher());
fm->add(rest, skip, limit);
}
}
BSONObj FieldMatcher::getSpec() const{
return _source;
}
//b will be the value part of an array-typed BSONElement
void FieldMatcher::appendArray( BSONObjBuilder& b , const BSONObj& a , bool nested) const {
int skip = nested ? 0 : _skip;
int limit = nested ? -1 : _limit;
if (skip < 0){
skip = max(0, skip + a.nFields());
}
int i=0;
BSONObjIterator it(a);
while (it.more()){
BSONElement e = it.next();
if (skip){
skip--;
continue;
}
if (limit != -1 && (limit-- == 0)){
break;
}
switch(e.type()){
case Array:{
BSONObjBuilder subb;
appendArray(subb , e.embeddedObject(), true);
b.appendArray(b.numStr(i++), subb.obj());
break;
}
case Object:{
BSONObjBuilder subb;
BSONObjIterator jt(e.embeddedObject());
while (jt.more()){
append(subb , jt.next());
}
b.append(b.numStr(i++), subb.obj());
break;
}
default:
if (_include)
b.appendAs(e, b.numStr(i++));
}
}
}
void FieldMatcher::append( BSONObjBuilder& b , const BSONElement& e ) const {
FieldMap::const_iterator field = _fields.find( e.fieldName() );
if (field == _fields.end()){
if (_include)
b.append(e);
}
else {
FieldMatcher& subfm = *field->second;
if ((subfm._fields.empty() && !subfm._special) || !(e.type()==Object || e.type()==Array) ){
if (subfm._include)
b.append(e);
}
else if (e.type() == Object){
BSONObjBuilder subb;
BSONObjIterator it(e.embeddedObject());
while (it.more()){
subfm.append(subb, it.next());
}
b.append(e.fieldName(), subb.obj());
}
else { //Array
BSONObjBuilder subb;
subfm.appendArray(subb, e.embeddedObject());
b.appendArray(e.fieldName(), subb.obj());
}
}
}
bool FieldRangeVector::matchesElement( const BSONElement &e, int i, bool forward ) const {
int l = matchingLowElement( e, i, forward );
return ( l % 2 == 0 ); // if we're inside an interval
}
int FieldRangeVector::matchingLowElement( const BSONElement &e, int i, bool forward ) const {
int l = -1;
int h = _ranges[ i ].intervals().size() * 2;
while( l + 1 < h ) {
int m = ( l + h ) / 2;
BSONElement toCmp;
if ( m % 2 == 0 ) {
toCmp = _ranges[ i ].intervals()[ m / 2 ]._lower._bound;
} else {
toCmp = _ranges[ i ].intervals()[ m / 2 ]._upper._bound;
}
int cmp = toCmp.woCompare( e, false );
if ( !forward ) {
cmp = -cmp;
}
if ( cmp < 0 ) {
l = m;
} else if ( cmp > 0 ) {
h = m;
} else {
return ( m % 2 == 0 ) ? m : m - 1;
}
}
assert( l + 1 == h );
return l;
}
bool FieldRangeVector::matches( const BSONObj &obj ) const {
BSONObjIterator k( _keyPattern );
for( int i = 0; i < (int)_ranges.size(); ++i ) {
if ( _ranges[ i ].empty() ) {
return false;
}
BSONElement kk = k.next();
int number = (int) kk.number();
bool forward = ( number >= 0 ? 1 : -1 ) * ( _direction >= 0 ? 1 : -1 ) > 0;
BSONElement e = obj.getField( kk.fieldName() );
if ( e.eoo() ) {
e = staticNull.firstElement();
}
if ( e.type() == Array ) {
BSONObjIterator j( e.embeddedObject() );
bool match = false;
while( j.more() ) {
if ( matchesElement( j.next(), i, forward ) ) {
match = true;
break;
}
}
if ( !match ) {
return false;
}
} else if ( !matchesElement( e, i, forward ) ) {
return false;