void getKeys(const BSONObj& obj, BSONObjSet& keys) const {
verify(_fields.size() >= 1);
BSONObjSet keysToAdd;
// We output keys in the same order as the fields we index.
for (size_t i = 0; i < _fields.size(); ++i) {
const IndexedField &field = _fields[i];
// First, we get the keys that this field adds. Either they're added literally from
// the value of the field, or they're transformed if the field is geo.
BSONElementSet fieldElements;
// false means Don't expand the last array, duh.
obj.getFieldsDotted(field.name, fieldElements, false);
BSONObjSet keysForThisField;
if (IndexedField::GEO == field.type) {
getGeoKeys(fieldElements, &keysForThisField);
} else if (IndexedField::LITERAL == field.type) {
getLiteralKeys(fieldElements, &keysForThisField);
} else {
verify(0);
}
// We expect there to be _spec->_missingField() present in the keys if data is
// missing. So, this should be non-empty.
verify(!keysForThisField.empty());
// We take the Cartesian product of all of the keys. This requires that we have
// some keys to take the Cartesian product with. If keysToAdd.empty(), we
// initialize it.
if (keysToAdd.empty()) {
keysToAdd = keysForThisField;
continue;
}
BSONObjSet updatedKeysToAdd;
for (BSONObjSet::const_iterator it = keysToAdd.begin(); it != keysToAdd.end();
++it) {
for (BSONObjSet::const_iterator newIt = keysForThisField.begin();
newIt!= keysForThisField.end(); ++newIt) {
BSONObjBuilder b;
b.appendElements(*it);
b.append(newIt->firstElement());
updatedKeysToAdd.insert(b.obj());
}
}
keysToAdd = updatedKeysToAdd;
}
if (keysToAdd.size() > _params.maxKeysPerInsert) {
warning() << "insert of geo object generated lots of keys (" << keysToAdd.size()
<< ") consider creating larger buckets. obj="
<< obj;
}
for (BSONObjSet::const_iterator it = keysToAdd.begin(); it != keysToAdd.end(); ++it) {
keys.insert(*it);
}
}
void S2AccessMethod::getKeys(const BSONObj& obj, BSONObjSet* keys) {
BSONObjSet keysToAdd;
// We output keys in the same order as the fields we index.
BSONObjIterator i(_descriptor->keyPattern());
while (i.more()) {
BSONElement e = i.next();
// First, we get the keys that this field adds. Either they're added literally from
// the value of the field, or they're transformed if the field is geo.
BSONElementSet fieldElements;
// false means Don't expand the last array, duh.
obj.getFieldsDotted(e.fieldName(), fieldElements, false);
BSONObjSet keysForThisField;
if (IndexNames::GEO_2DSPHERE == e.valuestr()) {
// We can't ever return documents that don't have geometry so don't bother indexing
// them.
if (fieldElements.empty()) { return; }
getGeoKeys(obj, fieldElements, &keysForThisField);
} else {
getLiteralKeys(fieldElements, &keysForThisField);
}
// We expect there to be the missing field element present in the keys if data is
// missing. So, this should be non-empty.
verify(!keysForThisField.empty());
// We take the Cartesian product of all of the keys. This requires that we have
// some keys to take the Cartesian product with. If keysToAdd.empty(), we
// initialize it.
if (keysToAdd.empty()) {
keysToAdd = keysForThisField;
continue;
}
BSONObjSet updatedKeysToAdd;
for (BSONObjSet::const_iterator it = keysToAdd.begin(); it != keysToAdd.end();
++it) {
for (BSONObjSet::const_iterator newIt = keysForThisField.begin();
newIt!= keysForThisField.end(); ++newIt) {
BSONObjBuilder b;
b.appendElements(*it);
b.append(newIt->firstElement());
updatedKeysToAdd.insert(b.obj());
}
}
keysToAdd = updatedKeysToAdd;
}
if (keysToAdd.size() > _params.maxKeysPerInsert) {
warning() << "insert of geo object generated lots of keys (" << keysToAdd.size()
<< ") consider creating larger buckets. obj="
<< obj;
}
*keys = keysToAdd;
}
void ExpressionKeysPrivate::getS2Keys(const BSONObj& obj,
const BSONObj& keyPattern,
const S2IndexingParams& params,
BSONObjSet* keys) {
BSONObjSet keysToAdd;
// Does one of our documents have a geo field?
bool haveGeoField = false;
// We output keys in the same order as the fields we index.
BSONObjIterator i(keyPattern);
while (i.more()) {
BSONElement e = i.next();
// First, we get the keys that this field adds. Either they're added literally from
// the value of the field, or they're transformed if the field is geo.
BSONElementSet fieldElements;
// false means Don't expand the last array, duh.
obj.getFieldsDotted(e.fieldName(), fieldElements, false);
BSONObjSet keysForThisField;
if (IndexNames::GEO_2DSPHERE == e.valuestr()) {
if (params.indexVersion >= S2_INDEX_VERSION_2) {
// For >= V2,
// geo: null,
// geo: undefined
// geo: []
// should all behave like there is no geo field. So we look for these cases and
// throw out the field elements if we find them.
if (1 == fieldElements.size()) {
BSONElement elt = *fieldElements.begin();
// Get the :null and :undefined cases.
if (elt.isNull() || Undefined == elt.type()) {
fieldElements.clear();
} else if (elt.isABSONObj()) {
// And this is the :[] case.
BSONObj obj = elt.Obj();
if (0 == obj.nFields()) {
fieldElements.clear();
}
}
}
// >= V2 2dsphere indices require that at least one geo field to be present in a
// document in order to index it.
if (fieldElements.size() > 0) {
haveGeoField = true;
}
}
getS2GeoKeys(obj, fieldElements, params, &keysForThisField);
} else {
getS2LiteralKeys(fieldElements, params.collator, &keysForThisField);
}
// We expect there to be the missing field element present in the keys if data is
// missing. So, this should be non-empty.
verify(!keysForThisField.empty());
// We take the Cartesian product of all of the keys. This requires that we have
// some keys to take the Cartesian product with. If keysToAdd.empty(), we
// initialize it.
if (keysToAdd.empty()) {
keysToAdd = keysForThisField;
continue;
}
BSONObjSet updatedKeysToAdd;
for (BSONObjSet::const_iterator it = keysToAdd.begin(); it != keysToAdd.end(); ++it) {
for (BSONObjSet::const_iterator newIt = keysForThisField.begin();
newIt != keysForThisField.end();
++newIt) {
BSONObjBuilder b;
b.appendElements(*it);
b.append(newIt->firstElement());
updatedKeysToAdd.insert(b.obj());
}
}
keysToAdd = updatedKeysToAdd;
}
// Make sure that if we're >= V2 there's at least one geo field present in the doc.
if (params.indexVersion >= S2_INDEX_VERSION_2) {
if (!haveGeoField) {
return;
}
}
if (keysToAdd.size() > params.maxKeysPerInsert) {
warning() << "Insert of geo object generated a high number of keys."
<< " num keys: " << keysToAdd.size() << " obj inserted: " << obj;
}
*keys = keysToAdd;
}
void ExpressionKeysPrivate::getS2Keys(const BSONObj& obj,
const BSONObj& keyPattern,
const S2IndexingParams& params,
BSONObjSet* keys,
MultikeyPaths* multikeyPaths) {
BSONObjSet keysToAdd = SimpleBSONObjComparator::kInstance.makeBSONObjSet();
// Does one of our documents have a geo field?
bool haveGeoField = false;
if (multikeyPaths) {
invariant(multikeyPaths->empty());
multikeyPaths->resize(keyPattern.nFields());
}
size_t posInIdx = 0;
// We output keys in the same order as the fields we index.
for (const auto keyElem : keyPattern) {
// First, we get the keys that this field adds. Either they're added literally from
// the value of the field, or they're transformed if the field is geo.
BSONElementSet fieldElements;
const bool expandArrayOnTrailingField = false;
std::set<size_t>* arrayComponents = multikeyPaths ? &(*multikeyPaths)[posInIdx] : nullptr;
dps::extractAllElementsAlongPath(
obj, keyElem.fieldName(), fieldElements, expandArrayOnTrailingField, arrayComponents);
// Trailing array values aren't being expanded, so we still need to determine whether the
// last component of the indexed path 'keyElem.fieldName()' causes the index to be multikey.
// We say that it does if
// (a) the last component of the indexed path ever refers to an array value (regardless of
// the number of array elements)
// (b) the last component of the indexed path ever refers to GeoJSON data that requires
// multiple cells for its covering.
bool lastPathComponentCausesIndexToBeMultikey;
BSONObjSet keysForThisField = SimpleBSONObjComparator::kInstance.makeBSONObjSet();
if (IndexNames::GEO_2DSPHERE == keyElem.valuestr()) {
if (params.indexVersion >= S2_INDEX_VERSION_2) {
// For >= V2,
// geo: null,
// geo: undefined
// geo: []
// should all behave like there is no geo field. So we look for these cases and
// throw out the field elements if we find them.
if (1 == fieldElements.size()) {
BSONElement elt = *fieldElements.begin();
// Get the :null and :undefined cases.
if (elt.isNull() || Undefined == elt.type()) {
fieldElements.clear();
} else if (elt.isABSONObj()) {
// And this is the :[] case.
BSONObj obj = elt.Obj();
if (0 == obj.nFields()) {
fieldElements.clear();
}
}
}
// >= V2 2dsphere indices require that at least one geo field to be present in a
// document in order to index it.
if (fieldElements.size() > 0) {
haveGeoField = true;
}
}
lastPathComponentCausesIndexToBeMultikey =
getS2GeoKeys(obj, fieldElements, params, &keysForThisField);
} else {
lastPathComponentCausesIndexToBeMultikey =
getS2LiteralKeys(fieldElements, params.collator, &keysForThisField);
}
// We expect there to be the missing field element present in the keys if data is
// missing. So, this should be non-empty.
verify(!keysForThisField.empty());
if (multikeyPaths && lastPathComponentCausesIndexToBeMultikey) {
const size_t pathLengthOfThisField = FieldRef{keyElem.fieldNameStringData()}.numParts();
invariant(pathLengthOfThisField > 0);
(*multikeyPaths)[posInIdx].insert(pathLengthOfThisField - 1);
}
// We take the Cartesian product of all of the keys. This requires that we have
// some keys to take the Cartesian product with. If keysToAdd.empty(), we
// initialize it.
if (keysToAdd.empty()) {
keysToAdd = keysForThisField;
++posInIdx;
continue;
}
BSONObjSet updatedKeysToAdd = SimpleBSONObjComparator::kInstance.makeBSONObjSet();
for (BSONObjSet::const_iterator it = keysToAdd.begin(); it != keysToAdd.end(); ++it) {
for (BSONObjSet::const_iterator newIt = keysForThisField.begin();
newIt != keysForThisField.end();
++newIt) {
BSONObjBuilder b;
b.appendElements(*it);
b.append(newIt->firstElement());
updatedKeysToAdd.insert(b.obj());
}
}
keysToAdd = updatedKeysToAdd;
++posInIdx;
}
// Make sure that if we're >= V2 there's at least one geo field present in the doc.
if (params.indexVersion >= S2_INDEX_VERSION_2) {
if (!haveGeoField) {
return;
}
}
if (keysToAdd.size() > params.maxKeysPerInsert) {
warning() << "Insert of geo object generated a high number of keys."
<< " num keys: " << keysToAdd.size() << " obj inserted: " << redact(obj);
}
*keys = keysToAdd;
}
