UpdateResult UpdateExecutor::execute(Database* db) {
uassertStatusOK(prepare());
LOG(3) << "processing update : " << *_request;
// If we've already done the in-lock preparation, this is a no-op.
Status status = prepareInLock(db);
uassert(17243,
"could not get executor " + _request->getQuery().toString()
+ "; " + causedBy(status),
status.isOK());
// Run the plan (don't need to collect results because UpdateStage always returns
// NEED_TIME).
uassertStatusOK(_exec->executePlan());
// Get stats from the root stage.
invariant(_exec->getRootStage()->stageType() == STAGE_UPDATE);
UpdateStage* updateStage = static_cast<UpdateStage*>(_exec->getRootStage());
const UpdateStats* updateStats =
static_cast<const UpdateStats*>(updateStage->getSpecificStats());
// Use stats from the root stage to fill out opDebug.
_opDebug->nMatched = updateStats->nMatched;
_opDebug->nModified = updateStats->nModified;
_opDebug->upsert = updateStats->inserted;
_opDebug->fastmodinsert = updateStats->fastmodinsert;
_opDebug->fastmod = updateStats->fastmod;
// Historically, 'opDebug' considers 'nMatched' and 'nModified' to be 1 (rather than 0) if
// there is an upsert that inserts a document. The UpdateStage does not participate in this
// madness in order to have saner stats reporting for explain. This means that we have to
// set these values "manually" in the case of an insert.
if (updateStats->inserted) {
_opDebug->nMatched = 1;
_opDebug->nModified = 1;
}
// Get summary information about the plan.
PlanSummaryStats stats;
Explain::getSummaryStats(_exec.get(), &stats);
_opDebug->nscanned = stats.totalKeysExamined;
_opDebug->nscannedObjects = stats.totalDocsExamined;
return UpdateResult(updateStats->nMatched > 0 /* Did we update at least one obj? */,
!_driver.isDocReplacement() /* $mod or obj replacement */,
_opDebug->nModified /* number of modified docs, no no-ops */,
_opDebug->nMatched /* # of docs matched/updated, even no-ops */,
updateStats->objInserted);
}
const UpdateStats* UpdateStage::getUpdateStats(const PlanExecutor* exec) {
invariant(exec->getRootStage()->isEOF());
invariant(exec->getRootStage()->stageType() == STAGE_UPDATE);
UpdateStage* updateStage = static_cast<UpdateStage*>(exec->getRootStage());
return static_cast<const UpdateStats*>(updateStage->getSpecificStats());
}
