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/**
* Copyright (C) 2013 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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/query/query_solution.h"
#include "mongo/db/query/lite_parsed_query.h"
namespace mongo {
string QuerySolutionNode::toString() const {
stringstream ss;
appendToString(&ss, 0);
return ss.str();
}
// static
void QuerySolutionNode::addIndent(stringstream* ss, int level) {
for (int i = 0; i < level; ++i) {
*ss << "---";
}
}
void QuerySolutionNode::addCommon(stringstream* ss, int indent) const {
addIndent(ss, indent + 1);
*ss << "fetched = " << fetched() << endl;
addIndent(ss, indent + 1);
*ss << "sortedByDiskLoc = " << sortedByDiskLoc() << endl;
addIndent(ss, indent + 1);
*ss << "getSort = [";
for (BSONObjSet::const_iterator it = getSort().begin(); it != getSort().end(); it++) {
*ss << it->toString() << ", ";
}
*ss << "]" << endl;
}
//
// TextNode
//
void TextNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "TEXT\n";
addIndent(ss, indent + 1);
*ss << "keyPattern = " << _indexKeyPattern.toString() << endl;
addIndent(ss, indent + 1);
*ss << "query = " << _query << endl;
addIndent(ss, indent + 1);
*ss << "language = " << _language << endl;
addCommon(ss, indent);
}
//
// CollectionScanNode
//
CollectionScanNode::CollectionScanNode() : tailable(false), direction(1) { }
void CollectionScanNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "COLLSCAN\n";
addIndent(ss, indent + 1);
*ss << "ns = " << name << endl;
if (NULL != filter) {
addIndent(ss, indent + 1);
*ss << " filter = " << filter->toString();
}
addCommon(ss, indent);
}
//
// AndHashNode
//
AndHashNode::AndHashNode() { }
AndHashNode::~AndHashNode() { }
void AndHashNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "AND_HASH\n";
if (NULL != filter) {
addIndent(ss, indent + 1);
*ss << " filter = " << filter->toString() << endl;
}
addCommon(ss, indent);
for (size_t i = 0; i < children.size(); ++i) {
addIndent(ss, indent + 1);
*ss << "Child " << i << ":\n";
children[i]->appendToString(ss, indent + 1);
}
}
bool AndHashNode::fetched() const {
// Any WSM output from this stage came from all children stages. If any child provides
// fetched data, we merge that fetched data into the WSM we output.
for (size_t i = 0; i < children.size(); ++i) {
if (children[i]->fetched()) {
return true;
}
}
return false;
}
bool AndHashNode::hasField(const string& field) const {
// Any WSM output from this stage came from all children stages. Therefore we have all
// fields covered in our children.
for (size_t i = 0; i < children.size(); ++i) {
if (children[i]->hasField(field)) {
return true;
}
}
return false;
}
//
// AndSortedNode
//
AndSortedNode::AndSortedNode() { }
AndSortedNode::~AndSortedNode() { }
void AndSortedNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "AND_SORTED";
if (NULL != filter) {
addIndent(ss, indent + 1);
*ss << " filter = " << filter->toString() << endl;
}
addCommon(ss, indent);
for (size_t i = 0; i < children.size(); ++i) {
*ss << "Child " << i << ": ";
children[i]->appendToString(ss, indent + 1);
}
}
bool AndSortedNode::fetched() const {
// Any WSM output from this stage came from all children stages. If any child provides
// fetched data, we merge that fetched data into the WSM we output.
for (size_t i = 0; i < children.size(); ++i) {
if (children[i]->fetched()) {
return true;
}
}
return false;
}
bool AndSortedNode::hasField(const string& field) const {
// Any WSM output from this stage came from all children stages. Therefore we have all
// fields covered in our children.
for (size_t i = 0; i < children.size(); ++i) {
if (children[i]->hasField(field)) {
return true;
}
}
return false;
}
//
// OrNode
//
OrNode::OrNode() : dedup(true) { }
OrNode::~OrNode() { }
void OrNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "OR\n";
if (NULL != filter) {
addIndent(ss, indent + 1);
*ss << " filter = " << filter->toString() << endl;
}
addCommon(ss, indent);
for (size_t i = 0; i < children.size(); ++i) {
addIndent(ss, indent + 1);
*ss << "Child " << i << ":\n";
children[i]->appendToString(ss, indent + 2);
*ss << endl;
}
}
bool OrNode::fetched() const {
// Any WSM output from this stage came exactly one child stage. Given that we don't know
// what child stage it came from, we require that all children provide fetched data in order
// to guarantee that our output is fetched.
for (size_t i = 0; i < children.size(); ++i) {
if (!children[i]->fetched()) {
return false;
}
}
return true;
}
/**
* Any WSM output from this stage came from exactly one child stage. Therefore, if
* we want to guarantee that any output has a certain field, all of our children must
* have that field.
*/
bool OrNode::hasField(const string& field) const {
for (size_t i = 0; i < children.size(); ++i) {
if (!children[i]->hasField(field)) {
return false;
}
}
return true;
}
//
// MergeSortNode
//
MergeSortNode::MergeSortNode() : dedup(true) { }
MergeSortNode::~MergeSortNode() { }
void MergeSortNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "MERGE_SORT\n";
if (NULL != filter) {
addIndent(ss, indent + 1);
*ss << " filter = " << filter->toString() << endl;
}
addCommon(ss, indent);
for (size_t i = 0; i < children.size(); ++i) {
addIndent(ss, indent + 1);
*ss << "Child " << i << ":\n";
children[i]->appendToString(ss, indent + 2);
*ss << endl;
}
}
bool MergeSortNode::fetched() const {
// Any WSM output from this stage came exactly one child stage. Given that we don't know
// what child stage it came from, we require that all children provide fetched data in order
// to guarantee that our output is fetched.
for (size_t i = 0; i < children.size(); ++i) {
if (!children[i]->fetched()) {
return false;
}
}
return true;
}
/**
* Any WSM output from this stage came from exactly one child stage. Therefore, if
* we want to guarantee that any output has a certain field, all of our children must
* have that field.
*/
bool MergeSortNode::hasField(const string& field) const {
for (size_t i = 0; i < children.size(); ++i) {
if (!children[i]->hasField(field)) {
return false;
}
}
return true;
}
//
// FetchNode
//
FetchNode::FetchNode() { }
void FetchNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "FETCH\n";
if (NULL != filter) {
addIndent(ss, indent + 1);
StringBuilder sb;
*ss << "filter:\n";
filter->debugString(sb, indent + 2);
*ss << sb.str();
}
addCommon(ss, indent);
addIndent(ss, indent + 1);
*ss << "Child:" << endl;
children[0]->appendToString(ss, indent + 2);
}
//
// IndexScanNode
//
IndexScanNode::IndexScanNode()
: indexIsMultiKey(false), limit(0), direction(1) { }
void IndexScanNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "IXSCAN\n";
addIndent(ss, indent + 1);
*ss << "keyPattern = " << indexKeyPattern << endl;
if (NULL != filter) {
addIndent(ss, indent + 1);
*ss << " filter= " << filter->toString() << endl;
}
addIndent(ss, indent + 1);
*ss << "direction = " << direction << endl;
addIndent(ss, indent + 1);
*ss << "bounds = " << bounds.toString() << endl;
addIndent(ss, indent + 1);
*ss << "fetched = " << fetched() << endl;
addCommon(ss, indent);
}
bool IndexScanNode::hasField(const string& field) const {
// There is no covering in a multikey index because you don't know whether or not the field
// in the key was extracted from an array in the original document.
if (indexIsMultiKey) { return false; }
BSONObjIterator it(indexKeyPattern);
while (it.more()) {
if (field == it.next().fieldName()) {
return true;
}
}
return false;
}
bool IndexScanNode::sortedByDiskLoc() const {
// Indices use DiskLoc as an additional key after the actual index key.
// Therefore, if we're only examining one index key, the output is sorted
// by DiskLoc.
// If it's a simple range query, it's easy to determine if the range is a point.
if (bounds.isSimpleRange) {
return 0 == bounds.startKey.woCompare(bounds.endKey, indexKeyPattern);
}
// If it's a more complex bounds query, we make sure that each field is a point.
for (size_t i = 0; i < bounds.fields.size(); ++i) {
const OrderedIntervalList& oil = bounds.fields[i];
if (1 != oil.intervals.size()) {
return false;
}
const Interval& interval = oil.intervals[0];
if (0 != interval.start.woCompare(interval.end, false)) {
return false;
}
}
return true;
}
void IndexScanNode::computeProperties() {
_sorts.clear();
BSONObj sortPattern;
{
BSONObjBuilder sortBob;
BSONObj normalizedIndexKeyPattern(LiteParsedQuery::normalizeSortOrder(indexKeyPattern));
BSONObjIterator it(normalizedIndexKeyPattern);
while (it.more()) {
BSONElement elt = it.next();
// Zero is returned if elt is not a number. This happens when elt is hashed or
// 2dsphere, our two projection indices. We want to drop those from the sort
// pattern.
int val = elt.numberInt() * direction;
if (0 != val) {
sortBob.append(elt.fieldName(), val);
}
}
sortPattern = sortBob.obj();
}
_sorts.insert(sortPattern);
const int nFields = sortPattern.nFields();
if (nFields > 1) {
// We're sorted not only by sortPattern but also by all prefixes of it.
for (int i = 0; i < nFields; ++i) {
// Make obj out of fields [0,i]
BSONObjIterator it(sortPattern);
BSONObjBuilder prefixBob;
for (int j = 0; j <= i; ++j) {
prefixBob.append(it.next());
}
_sorts.insert(prefixBob.obj());
}
}
// If we are using the index {a:1, b:1} to answer the predicate {a: 10}, it's sorted
// both by the index key pattern and by the pattern {b: 1}.
// See if there are any fields with equalities for bounds. We can drop these
// from any sort orders created.
set<string> equalityFields;
if (!bounds.isSimpleRange) {
// Figure out how many fields are point intervals.
for (size_t i = 0; i < bounds.fields.size(); ++i) {
const OrderedIntervalList& oil = bounds.fields[i];
if (oil.intervals.size() != 1) {
continue;
}
const Interval& ival = oil.intervals[0];
if (!ival.isPoint()) {
continue;
}
equalityFields.insert(oil.name);
}
}
if (equalityFields.empty()) {
return;
}
// TODO: Each field in equalityFields could be dropped from the sort order since it is
// a point interval. The full set of sort orders is as follows:
// For each sort in _sorts:
// For each drop in powerset(equalityFields):
// Remove fields in 'drop' from 'sort' and add resulting sort to output.
// Since this involves a powerset, we only remove point intervals that the prior sort
// planning code removed, namely the contiguous prefix of the key pattern.
BSONObjIterator it(sortPattern);
BSONObjBuilder prefixBob;
while (it.more()) {
BSONElement elt = it.next();
// XXX string slowness. fix when bounds are stringdata not string.
if (equalityFields.end() == equalityFields.find(string(elt.fieldName()))) {
prefixBob.append(elt);
// This field isn't a point interval, can't drop.
break;
}
}
while (it.more()) {
prefixBob.append(it.next());
}
// If we have an index {a:1} and an equality on 'a' don't append an empty sort order.
BSONObj filterPointsObj = prefixBob.obj();
if (!filterPointsObj.isEmpty()) {
_sorts.insert(filterPointsObj);
}
}
//
// ProjectionNode
//
void ProjectionNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "PROJ\n";
addIndent(ss, indent + 1);
*ss << "proj = " << projection.toString() << endl;
addCommon(ss, indent);
*ss << "Child:" << endl;
children[0]->appendToString(ss, indent + 2);
}
//
// SortNode
//
void SortNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "SORT\n";
addIndent(ss, indent + 1);
*ss << "pattern = " << pattern.toString() << endl;
addIndent(ss, indent + 1);
*ss << "query for bounds = " << query.toString() << endl;
addCommon(ss, indent);
*ss << "Child:" << endl;
children[0]->appendToString(ss, indent + 2);
}
//
// LimitNode
//
void LimitNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "LIMIT\n";
addIndent(ss, indent + 1);
*ss << "limit = " << limit << endl;
addIndent(ss, indent + 1);
addCommon(ss, indent);
*ss << "Child:" << endl;
children[0]->appendToString(ss, indent + 2);
}
//
// SkipNode
//
void SkipNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "SKIP\n";
addIndent(ss, indent + 1);
*ss << "skip= " << skip << endl;
addCommon(ss, indent);
*ss << "Child:" << endl;
children[0]->appendToString(ss, indent + 2);
}
//
// GeoNear2DNode
//
void GeoNear2DNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "GEO_NEAR_2D\n";
addIndent(ss, indent + 1);
*ss << "keyPattern = " << indexKeyPattern.toString() << endl;
addCommon(ss, indent);
*ss << "nearQuery = " << nq.toString() << endl;
if (NULL != filter) {
addIndent(ss, indent + 1);
*ss << " filter = " << filter->toString();
}
}
//
// GeoNear2DSphereNode
//
void GeoNear2DSphereNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "GEO_NEAR_2DSPHERE\n";
addIndent(ss, indent + 1);
*ss << "keyPattern = " << indexKeyPattern.toString() << endl;
addCommon(ss, indent);
*ss << "baseBounds = " << baseBounds.toString() << endl;
addIndent(ss, indent + 1);
*ss << "nearQuery = " << nq.toString() << endl;
if (NULL != filter) {
addIndent(ss, indent + 1);
*ss << " filter = " << filter->toString();
}
}
//
// Geo2DNode
//
void Geo2DNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "GEO_2D\n";
addIndent(ss, indent + 1);
*ss << "keyPattern = " << indexKeyPattern.toString() << endl;
addCommon(ss, indent);
}
bool Geo2DNode::hasField(const string& field) const {
BSONObjIterator it(indexKeyPattern);
while (it.more()) {
if (field == it.next().fieldName()) {
return true;
}
}
return false;
}
//
// ShardingFilterNode
//
void ShardingFilterNode::appendToString(stringstream* ss, int indent) const {
addIndent(ss, indent);
*ss << "SHARDING_FILTER\n";
if (NULL != filter) {
addIndent(ss, indent + 1);
StringBuilder sb;
*ss << "filter:\n";
filter->debugString(sb, indent + 2);
*ss << sb.str();
}
addCommon(ss, indent);
addIndent(ss, indent + 1);
*ss << "Child:" << endl;
children[0]->appendToString(ss, indent + 2);
}
} // namespace mongo
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