Status SortKeyGenerator::getSortKey(const WorkingSetMember& member, BSONObj* objOut) const {
StatusWith<BSONObj> sortKey = BSONObj();
if (member.hasObj()) {
sortKey = getSortKeyFromObject(member);
} else {
sortKey = getSortKeyFromIndexKey(member);
}
if (!sortKey.isOK()) {
return sortKey.getStatus();
}
if (!_sortHasMeta) {
*objOut = sortKey.getValue();
return Status::OK();
}
BSONObjBuilder mergedKeyBob;
// Merge metadata into the key.
BSONObjIterator it(_rawSortSpec);
BSONObjIterator sortKeyIt(sortKey.getValue());
while (it.more()) {
BSONElement elt = it.next();
if (elt.isNumber()) {
// Merge btree key elt.
mergedKeyBob.append(sortKeyIt.next());
} else if (LiteParsedQuery::isTextScoreMeta(elt)) {
// Add text score metadata
double score = 0.0;
if (member.hasComputed(WSM_COMPUTED_TEXT_SCORE)) {
const TextScoreComputedData* scoreData = static_cast<const TextScoreComputedData*>(
member.getComputed(WSM_COMPUTED_TEXT_SCORE));
score = scoreData->getScore();
}
mergedKeyBob.append("$metaTextScore", score);
}
}
*objOut = mergedKeyBob.obj();
return Status::OK();
}
void ParallelSortClusteredCursor::_finishCons() {
_numServers = _servers.size();
_lastFrom = 0;
_cursors = 0;
if (!_qSpec.isEmpty()) {
_needToSkip = _qSpec.ntoskip();
_cursors = 0;
_sortKey = _qSpec.sort();
_fields = _qSpec.fields();
}
// Partition sort key fields into (a) text meta fields and (b) all other fields.
set<string> textMetaSortKeyFields;
set<string> normalSortKeyFields;
// Transform _sortKey fields {a:{$meta:"textScore"}} into {a:-1}, in order to apply the
// merge sort for text metadata in the correct direction.
BSONObjBuilder transformedSortKeyBuilder;
BSONObjIterator sortKeyIt(_sortKey);
while (sortKeyIt.more()) {
BSONElement e = sortKeyIt.next();
if (LiteParsedQuery::isTextScoreMeta(e)) {
textMetaSortKeyFields.insert(e.fieldName());
transformedSortKeyBuilder.append(e.fieldName(), -1);
} else {
normalSortKeyFields.insert(e.fieldName());
transformedSortKeyBuilder.append(e);
}
}
_sortKey = transformedSortKeyBuilder.obj();
// Verify that that all text metadata sort fields are in the projection. For all other sort
// fields, copy them into the projection if they are missing (and if projection is
// negative).
if (!_sortKey.isEmpty() && !_fields.isEmpty()) {
BSONObjBuilder b;
bool isNegative = false;
{
BSONObjIterator i(_fields);
while (i.more()) {
BSONElement e = i.next();
b.append(e);
string fieldName = e.fieldName();
if (LiteParsedQuery::isTextScoreMeta(e)) {
textMetaSortKeyFields.erase(fieldName);
} else {
// exact field
bool found = normalSortKeyFields.erase(fieldName);
// subfields
set<string>::const_iterator begin =
normalSortKeyFields.lower_bound(fieldName + ".\x00");
set<string>::const_iterator end =
normalSortKeyFields.lower_bound(fieldName + ".\xFF");
normalSortKeyFields.erase(begin, end);
if (!e.trueValue()) {
uassert(13431,
"have to have sort key in projection and removing it",
!found && begin == end);
} else if (!e.isABSONObj()) {
isNegative = true;
}
}
}
}
if (isNegative) {
for (set<string>::const_iterator it(normalSortKeyFields.begin()),
end(normalSortKeyFields.end());
it != end;
++it) {
b.append(*it, 1);
}
}
_fields = b.obj();
}
if (!_qSpec.isEmpty()) {
_qSpec.setFields(_fields);
}
uassert(
17306, "have to have all text meta sort keys in projection", textMetaSortKeyFields.empty());
}