/**
* Copyright (C) 2014 MongoDB 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 .
*
* 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kQuery
#include "mongo/platform/basic.h"
#include "mongo/db/exec/update.h"
#include "mongo/bson/mutable/algorithm.h"
#include "mongo/db/exec/scoped_timer.h"
#include "mongo/db/exec/working_set_common.h"
#include "mongo/db/ops/update_lifecycle.h"
#include "mongo/db/repl/repl_coordinator_global.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/util/log.h"
namespace mongo {
namespace mb = mutablebson;
namespace {
const char idFieldName[] = "_id";
const FieldRef idFieldRef(idFieldName);
Status storageValid(const mb::Document&, const bool);
Status storageValid(const mb::ConstElement&, const bool);
Status storageValidChildren(const mb::ConstElement&, const bool);
/**
* mutable::document storageValid check -- like BSONObj::_okForStorage
*/
Status storageValid(const mb::Document& doc, const bool deep = true) {
mb::ConstElement currElem = doc.root().leftChild();
while (currElem.ok()) {
if (currElem.getFieldName() == idFieldName) {
switch (currElem.getType()) {
case RegEx:
case Array:
case Undefined:
return Status(ErrorCodes::InvalidIdField,
str::stream() << "The '_id' value cannot be of type "
<< typeName(currElem.getType()));
default:
break;
}
}
Status s = storageValid(currElem, deep);
if (!s.isOK())
return s;
currElem = currElem.rightSibling();
}
return Status::OK();
}
/**
* Validates an element that has a field name which starts with a dollar sign ($).
* In the case of a DBRef field ($id, $ref, [$db]) these fields may be valid in
* the correct order/context only.
*/
Status validateDollarPrefixElement(const mb::ConstElement elem, const bool deep) {
mb::ConstElement curr = elem;
StringData currName = elem.getFieldName();
// Found a $db field
if (currName == "$db") {
if (curr.getType() != String) {
return Status(ErrorCodes::InvalidDBRef,
str::stream() << "The DBRef $db field must be a String, not a "
<< typeName(curr.getType()));
}
curr = curr.leftSibling();
if (!curr.ok() || (curr.getFieldName() != "$id"))
return Status(ErrorCodes::InvalidDBRef,
"Found $db field without a $id before it, which is invalid.");
currName = curr.getFieldName();
}
// Found a $id field
if (currName == "$id") {
Status s = storageValidChildren(curr, deep);
if (!s.isOK())
return s;
curr = curr.leftSibling();
if (!curr.ok() || (curr.getFieldName() != "$ref")) {
return Status(ErrorCodes::InvalidDBRef,
"Found $id field without a $ref before it, which is invalid.");
}
currName = curr.getFieldName();
}
if (currName == "$ref") {
if (curr.getType() != String) {
return Status(ErrorCodes::InvalidDBRef,
str::stream() << "The DBRef $ref field must be a String, not a "
<< typeName(curr.getType()));
}
if (!curr.rightSibling().ok() || curr.rightSibling().getFieldName() != "$id")
return Status(ErrorCodes::InvalidDBRef,
str::stream() << "The DBRef $ref field must be "
"following by a $id field");
}
else {
// not an okay, $ prefixed field name.
return Status(ErrorCodes::DollarPrefixedFieldName,
str::stream() << "The dollar ($) prefixed field '"
<< elem.getFieldName() << "' in '"
<< mb::getFullName(elem)
<< "' is not valid for storage.");
}
return Status::OK();
}
Status storageValid(const mb::ConstElement& elem, const bool deep = true) {
if (!elem.ok())
return Status(ErrorCodes::BadValue, "Invalid elements cannot be stored.");
// Field names of elements inside arrays are not meaningful in mutable bson,
// so we do not want to validate them.
//
// TODO: Revisit how mutable handles array field names. We going to need to make
// this better if we ever want to support ordered updates that can alter the same
// element repeatedly; see SERVER-12848.
const bool childOfArray = elem.parent().ok() ?
(elem.parent().getType() == mongo::Array) : false;
if (!childOfArray) {
StringData fieldName = elem.getFieldName();
// Cannot start with "$", unless dbref
if (fieldName[0] == '$') {
Status status = validateDollarPrefixElement(elem, deep);
if (!status.isOK())
return status;
}
else if (fieldName.find(".") != string::npos) {
// Field name cannot have a "." in it.
return Status(ErrorCodes::DottedFieldName,
str::stream() << "The dotted field '"
<< elem.getFieldName() << "' in '"
<< mb::getFullName(elem)
<< "' is not valid for storage.");
}
}
// Check children if there are any.
Status s = storageValidChildren(elem, deep);
if (!s.isOK())
return s;
return Status::OK();
}
Status storageValidChildren(const mb::ConstElement& elem, const bool deep) {
if (!elem.hasChildren())
return Status::OK();
mb::ConstElement curr = elem.leftChild();
while (curr.ok()) {
Status s = storageValid(curr, deep);
if (!s.isOK())
return s;
curr = curr.rightSibling();
}
return Status::OK();
}
/**
* This will verify that all updated fields are
* 1.) Valid for storage (checking parent to make sure things like DBRefs are valid)
* 2.) Compare updated immutable fields do not change values
*
* If updateFields is empty then it was replacement and/or we need to check all fields
*/
inline Status validate(const BSONObj& original,
const FieldRefSet& updatedFields,
const mb::Document& updated,
const std::vector* immutableAndSingleValueFields,
const ModifierInterface::Options& opts) {
LOG(3) << "update validate options -- "
<< " updatedFields: " << updatedFields
<< " immutableAndSingleValueFields.size:"
<< (immutableAndSingleValueFields ? immutableAndSingleValueFields->size() : 0)
<< " fromRepl: " << opts.fromReplication
<< " validate:" << opts.enforceOkForStorage;
// 1.) Loop through each updated field and validate for storage
// and detect immutable field updates
// The set of possibly changed immutable fields -- we will need to check their vals
FieldRefSet changedImmutableFields;
// Check to see if there were no fields specified or if we are not validating
// The case if a range query, or query that didn't result in saved fields
if (updatedFields.empty() || !opts.enforceOkForStorage) {
if (opts.enforceOkForStorage) {
// No specific fields were updated so the whole doc must be checked
Status s = storageValid(updated, true);
if (!s.isOK())
return s;
}
// Check all immutable fields
if (immutableAndSingleValueFields)
changedImmutableFields.fillFrom(*immutableAndSingleValueFields);
}
else {
// TODO: Change impl so we don't need to create a new FieldRefSet
// -- move all conflict logic into static function on FieldRefSet?
FieldRefSet immutableFieldRef;
if (immutableAndSingleValueFields)
immutableFieldRef.fillFrom(*immutableAndSingleValueFields);
FieldRefSet::const_iterator where = updatedFields.begin();
const FieldRefSet::const_iterator end = updatedFields.end();
for( ; where != end; ++where) {
const FieldRef& current = **where;
// Find the updated field in the updated document.
mutablebson::ConstElement newElem = updated.root();
size_t currentPart = 0;
while (newElem.ok() && currentPart < current.numParts())
newElem = newElem[current.getPart(currentPart++)];
// newElem might be missing if $unset/$renamed-away
if (newElem.ok()) {
Status s = storageValid(newElem, true);
if (!s.isOK())
return s;
}
// Check if the updated field conflicts with immutable fields
immutableFieldRef.findConflicts(¤t, &changedImmutableFields);
}
}
const bool checkIdField = (updatedFields.empty() && !original.isEmpty()) ||
updatedFields.findConflicts(&idFieldRef, NULL);
// Add _id to fields to check since it too is immutable
if (checkIdField)
changedImmutableFields.keepShortest(&idFieldRef);
else if (changedImmutableFields.empty()) {
// Return early if nothing changed which is immutable
return Status::OK();
}
LOG(4) << "Changed immutable fields: " << changedImmutableFields;
// 2.) Now compare values of the changed immutable fields (to make sure they haven't)
const mutablebson::ConstElement newIdElem = updated.root()[idFieldName];
FieldRefSet::const_iterator where = changedImmutableFields.begin();
const FieldRefSet::const_iterator end = changedImmutableFields.end();
for( ; where != end; ++where ) {
const FieldRef& current = **where;
// Find the updated field in the updated document.
mutablebson::ConstElement newElem = updated.root();
size_t currentPart = 0;
while (newElem.ok() && currentPart < current.numParts())
newElem = newElem[current.getPart(currentPart++)];
if (!newElem.ok()) {
if (original.isEmpty()) {
// If the _id is missing and not required, then skip this check
if (!(current.dottedField() == idFieldName))
return Status(ErrorCodes::NoSuchKey,
mongoutils::str::stream()
<< "After applying the update, the new"
<< " document was missing the '"
<< current.dottedField()
<< "' (required and immutable) field.");
}
else {
if (current.dottedField() != idFieldName)
return Status(ErrorCodes::ImmutableField,
mongoutils::str::stream()
<< "After applying the update to the document with "
<< newIdElem.toString()
<< ", the '" << current.dottedField()
<< "' (required and immutable) field was "
"found to have been removed --"
<< original);
}
}
else {
// Find the potentially affected field in the original document.
const BSONElement oldElem = original.getFieldDotted(current.dottedField());
const BSONElement oldIdElem = original.getField(idFieldName);
// Ensure no arrays since neither _id nor shard keys can be in an array, or one.
mb::ConstElement currElem = newElem;
while (currElem.ok()) {
if (currElem.getType() == Array) {
return Status(ErrorCodes::NotSingleValueField,
mongoutils::str::stream()
<< "After applying the update to the document {"
<< (oldIdElem.ok() ? oldIdElem.toString() :
newIdElem.toString())
<< " , ...}, the (immutable) field '"
<< current.dottedField()
<< "' was found to be an array or array descendant.");
}
currElem = currElem.parent();
}
// If we have both (old and new), compare them. If we just have new we are good
if (oldElem.ok() && newElem.compareWithBSONElement(oldElem, false) != 0) {
return Status(ErrorCodes::ImmutableField,
mongoutils::str::stream()
<< "After applying the update to the document {"
<< (oldIdElem.ok() ? oldIdElem.toString() :
newIdElem.toString())
<< " , ...}, the (immutable) field '" << current.dottedField()
<< "' was found to have been altered to "
<< newElem.toString());
}
}
}
return Status::OK();
}
Status ensureIdAndFirst(mb::Document& doc) {
mb::Element idElem = mb::findFirstChildNamed(doc.root(), idFieldName);
// Move _id as first element if it exists
if (idElem.ok()) {
if (idElem.leftSibling().ok()) {
Status s = idElem.remove();
if (!s.isOK())
return s;
s = doc.root().pushFront(idElem);
if (!s.isOK())
return s;
}
}
else {
// Create _id if the document does not currently have one.
idElem = doc.makeElementNewOID(idFieldName);
if (!idElem.ok())
return Status(ErrorCodes::BadValue,
"Could not create new _id ObjectId element.",
17268);
Status s = doc.root().pushFront(idElem);
if (!s.isOK())
return s;
}
return Status::OK();
}
} // namespace
// static
const char* UpdateStage::kStageType = "UPDATE";
UpdateStage::UpdateStage(const UpdateStageParams& params,
WorkingSet* ws,
Database* db,
PlanStage* child)
: _params(params),
_ws(ws),
_db(db),
_child(child),
_commonStats(kStageType),
_updatedLocs(params.request->isMulti() ? new DiskLocSet() : NULL),
_doc(params.driver->getDocument()) {
// We are an update until we fall into the insert case.
params.driver->setContext(ModifierInterface::ExecInfo::UPDATE_CONTEXT);
_collection = db->getCollection(params.request->getOpCtx(),
params.request->getNamespaceString().ns());
}
void UpdateStage::transformAndUpdate(BSONObj& oldObj, DiskLoc& loc) {
const UpdateRequest* request = _params.request;
UpdateDriver* driver = _params.driver;
CanonicalQuery* cq = _params.canonicalQuery;
UpdateLifecycle* lifecycle = request->getLifecycle();
// Ask the driver to apply the mods. It may be that the driver can apply those "in
// place", that is, some values of the old document just get adjusted without any
// change to the binary layout on the bson layer. It may be that a whole new
// document is needed to accomodate the new bson layout of the resulting document.
_doc.reset(oldObj, mutablebson::Document::kInPlaceEnabled);
BSONObj logObj;
FieldRefSet updatedFields;
Status status = Status::OK();
if (!driver->needMatchDetails()) {
// If we don't need match details, avoid doing the rematch
status = driver->update(StringData(), &_doc, &logObj, &updatedFields);
}
else {
// If there was a matched field, obtain it.
MatchDetails matchDetails;
matchDetails.requestElemMatchKey();
dassert(cq);
verify(cq->root()->matchesBSON(oldObj, &matchDetails));
string matchedField;
if (matchDetails.hasElemMatchKey())
matchedField = matchDetails.elemMatchKey();
// TODO: Right now, each mod checks in 'prepare' that if it needs positional
// data, that a non-empty StringData() was provided. In principle, we could do
// that check here in an else clause to the above conditional and remove the
// checks from the mods.
status = driver->update(matchedField, &_doc, &logObj, &updatedFields);
}
if (!status.isOK()) {
uasserted(16837, status.reason());
}
// Ensure _id exists and is first
uassertStatusOK(ensureIdAndFirst(_doc));
// If the driver applied the mods in place, we can ask the mutable for what
// changed. We call those changes "damages". :) We use the damages to inform the
// journal what was changed, and then apply them to the original document
// ourselves. If, however, the driver applied the mods out of place, we ask it to
// generate a new, modified document for us. In that case, the file manager will
// take care of the journaling details for us.
//
// This code flow is admittedly odd. But, right now, journaling is baked in the file
// manager. And if we aren't using the file manager, we have to do jounaling
// ourselves.
bool docWasModified = false;
BSONObj newObj;
const char* source = NULL;
bool inPlace = _doc.getInPlaceUpdates(&_damages, &source);
// If something changed in the document, verify that no immutable fields were changed
// and data is valid for storage.
if ((!inPlace || !_damages.empty()) ) {
if (!(request->isFromReplication() || request->isFromMigration())) {
const std::vector* immutableFields = NULL;
if (lifecycle)
immutableFields = lifecycle->getImmutableFields();
uassertStatusOK(validate(oldObj,
updatedFields,
_doc,
immutableFields,
driver->modOptions()) );
}
}
// Save state before making changes
saveState();
{
WriteUnitOfWork wunit(request->getOpCtx());
if (inPlace && !driver->modsAffectIndices()) {
// If a set of modifiers were all no-ops, we are still 'in place', but there
// is no work to do, in which case we want to consider the object unchanged.
if (!_damages.empty() ) {
// Don't actually do the write if this is an explain.
if (!request->isExplain()) {
invariant(_collection);
_collection->updateDocumentWithDamages(request->getOpCtx(), loc, source,
_damages);
}
docWasModified = true;
_specificStats.fastmod = true;
}
newObj = oldObj;
}
else {
// The updates were not in place. Apply them through the file manager.
newObj = _doc.getObject();
uassert(17419,
str::stream() << "Resulting document after update is larger than "
<< BSONObjMaxUserSize,
newObj.objsize() <= BSONObjMaxUserSize);
docWasModified = true;
// Don't actually do the write if this is an explain.
if (!request->isExplain()) {
invariant(_collection);
StatusWith res = _collection->updateDocument(request->getOpCtx(),
loc,
newObj,
true,
_params.opDebug);
uassertStatusOK(res.getStatus());
DiskLoc newLoc = res.getValue();
// If the document moved, we might see it again in a collection scan (maybe it's
// a document after our current document).
//
// If the document is indexed and the mod changes an indexed value, we might see
// it again. For an example, see the comment above near declaration of
// updatedLocs.
if (_updatedLocs && (newLoc != loc || driver->modsAffectIndices())) {
_updatedLocs->insert(newLoc);
}
}
}
// Call logOp if requested, and we're not an explain.
if (request->shouldCallLogOp() && !logObj.isEmpty() && !request->isExplain()) {
BSONObj idQuery = driver->makeOplogEntryQuery(newObj, request->isMulti());
repl::logOp(request->getOpCtx(),
"u",
request->getNamespaceString().ns().c_str(),
logObj,
&idQuery,
NULL,
request->isFromMigration());
}
wunit.commit();
}
// Restore state after modification
// As restoreState may restore (recreate) cursors, make sure to restore the
// state outside of the WritUnitOfWork.
restoreState(request->getOpCtx());
// Only record doc modifications if they wrote (exclude no-ops). Explains get
// recorded as if they wrote.
if (docWasModified) {
_specificStats.nModified++;
}
}
void UpdateStage::doInsert() {
_specificStats.inserted = true;
const UpdateRequest* request = _params.request;
UpdateDriver* driver = _params.driver;
CanonicalQuery* cq = _params.canonicalQuery;
UpdateLifecycle* lifecycle = request->getLifecycle();
// Since this is an insert (no docs found and upsert:true), we will be logging it
// as an insert in the oplog. We don't need the driver's help to build the
// oplog record, then. We also set the context of the update driver to the INSERT_CONTEXT.
// Some mods may only work in that context (e.g. $setOnInsert).
driver->setLogOp(false);
driver->setContext(ModifierInterface::ExecInfo::INSERT_CONTEXT);
// Reset the document we will be writing to
_doc.reset();
// This remains the empty object in the case of an object replacement, but in the case
// of an upsert where we are creating a base object from the query and applying mods,
// we capture the query as the original so that we can detect immutable field mutations.
BSONObj original = BSONObj();
// Calling populateDocumentWithQueryFields will populate the '_doc' with fields from the
// query which creates the base of the update for the inserted doc (because upsert
// was true).
if (cq) {
uassertStatusOK(driver->populateDocumentWithQueryFields(cq, _doc));
if (!driver->isDocReplacement()) {
_specificStats.fastmodinsert = true;
// We need all the fields from the query to compare against for validation below.
original = _doc.getObject();
}
else {
original = request->getQuery();
}
}
else {
fassert(17354, CanonicalQuery::isSimpleIdQuery(request->getQuery()));
BSONElement idElt = request->getQuery()[idFieldName];
original = idElt.wrap();
fassert(17352, _doc.root().appendElement(idElt));
}
// Apply the update modifications and then log the update as an insert manually.
Status status = driver->update(StringData(), &_doc);
if (!status.isOK()) {
uasserted(16836, status.reason());
}
// Ensure _id exists and is first
uassertStatusOK(ensureIdAndFirst(_doc));
// Validate that the object replacement or modifiers resulted in a document
// that contains all the immutable keys and can be stored if it isn't coming
// from a migration or via replication.
if (!(request->isFromReplication() || request->isFromMigration())){
const std::vector* immutableFields = NULL;
if (lifecycle)
immutableFields = lifecycle->getImmutableFields();
FieldRefSet noFields;
// This will only validate the modified fields if not a replacement.
uassertStatusOK(validate(original,
noFields,
_doc,
immutableFields,
driver->modOptions()) );
}
// Insert the doc
BSONObj newObj = _doc.getObject();
uassert(17420,
str::stream() << "Document to upsert is larger than " << BSONObjMaxUserSize,
newObj.objsize() <= BSONObjMaxUserSize);
_specificStats.objInserted = newObj;
// If this is an explain, bail out now without doing the insert.
if (request->isExplain()) {
return;
}
WriteUnitOfWork wunit(request->getOpCtx());
invariant(_collection);
StatusWith newLoc = _collection->insertDocument(request->getOpCtx(),
newObj,
!request->isGod()/*enforceQuota*/);
uassertStatusOK(newLoc.getStatus());
if (request->shouldCallLogOp()) {
repl::logOp(request->getOpCtx(),
"i",
request->getNamespaceString().ns().c_str(),
newObj,
NULL,
NULL,
request->isFromMigration());
}
wunit.commit();
}
bool UpdateStage::doneUpdating() {
// We're done updating if either the child has no more results to give us, or we've
// already gotten a result back and we're not a multi-update.
return _child->isEOF() || (_specificStats.nMatched > 0 && !_params.request->isMulti());
}
bool UpdateStage::needInsert() {
// We need to insert if
// 1) we haven't inserted already,
// 2) the child stage returned zero matches, and
// 3) the user asked for an upsert.
return !_specificStats.inserted
&& _specificStats.nMatched == 0
&& _params.request->isUpsert();
}
bool UpdateStage::isEOF() {
return doneUpdating() && !needInsert();
}
PlanStage::StageState UpdateStage::work(WorkingSetID* out) {
++_commonStats.works;
// Adds the amount of time taken by work() to executionTimeMillis.
ScopedTimer timer(&_commonStats.executionTimeMillis);
if (isEOF()) { return PlanStage::IS_EOF; }
if (doneUpdating()) {
// Even if we're done updating, we may have some inserting left to do.
if (needInsert()) {
doInsert();
}
// At this point either we're done updating and there was no insert to do,
// or we're done updating and we're done inserting. Either way, we're EOF.
invariant(isEOF());
return PlanStage::IS_EOF;
}
// If we're here, then we still have to ask for results from the child and apply
// updates to them. We should only get here if the collection exists.
invariant(_collection);
WorkingSetID id = WorkingSet::INVALID_ID;
StageState status = _child->work(&id);
if (PlanStage::ADVANCED == status) {
// Need to get these things from the result returned by the child.
DiskLoc loc;
BSONObj oldObj;
WorkingSetMember* member = _ws->get(id);
if (!member->hasLoc()) {
_ws->free(id);
const std::string errmsg = "update stage failed to read member w/ loc from child";
*out = WorkingSetCommon::allocateStatusMember(_ws, Status(ErrorCodes::InternalError,
errmsg));
return PlanStage::FAILURE;
}
loc = member->loc;
// Updates can't have projections. This means that covering analysis will always add
// a fetch. We should always get fetched data, and never just key data.
invariant(member->hasObj());
oldObj = member->obj;
// If we're here, then we have retrieved both a DiskLoc and the corresponding
// unowned object from the child stage. Since we have the object and the diskloc,
// we can free the WSM.
_ws->free(id);
// We fill this with the new locs of moved doc so we don't double-update.
if (_updatedLocs && _updatedLocs->count(loc) > 0) {
// Found a loc that we already updated.
++_commonStats.needTime;
return PlanStage::NEED_TIME;
}
++_specificStats.nMatched;
// Do the update and return.
transformAndUpdate(oldObj, loc);
++_commonStats.needTime;
return PlanStage::NEED_TIME;
}
else if (PlanStage::IS_EOF == status) {
// The child is out of results, but we might not be done yet because we still might
// have to do an insert.
++_commonStats.needTime;
return PlanStage::NEED_TIME;
}
else if (PlanStage::FAILURE == status) {
*out = id;
// If a stage fails, it may create a status WSM to indicate why it failed, in which case
// 'id' is valid. If ID is invalid, we create our own error message.
if (WorkingSet::INVALID_ID == id) {
const std::string errmsg = "delete stage failed to read in results from child";
*out = WorkingSetCommon::allocateStatusMember(_ws, Status(ErrorCodes::InternalError,
errmsg));
return PlanStage::FAILURE;
}
return status;
}
else {
if (PlanStage::NEED_TIME == status) {
++_commonStats.needTime;
}
return status;
}
}
void UpdateStage::saveState() {
++_commonStats.yields;
_child->saveState();
}
void UpdateStage::restoreState(OperationContext* opCtx) {
++_commonStats.unyields;
_child->restoreState(opCtx);
}
void UpdateStage::invalidate(const DiskLoc& dl, InvalidationType type) {
++_commonStats.invalidates;
_child->invalidate(dl, type);
}
vector UpdateStage::getChildren() const {
vector children;
children.push_back(_child.get());
return children;
}
PlanStageStats* UpdateStage::getStats() {
_commonStats.isEOF = isEOF();
auto_ptr ret(new PlanStageStats(_commonStats, STAGE_UPDATE));
ret->specific.reset(new UpdateStats(_specificStats));
ret->children.push_back(_child->getStats());
return ret.release();
}
const CommonStats* UpdateStage::getCommonStats() {
return &_commonStats;
}
const SpecificStats* UpdateStage::getSpecificStats() {
return &_specificStats;
}
} // namespace mongo