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SERVER-80720 - [refine] mongod: check duplicated fields in create indexes #1568

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SERVER-80720 - [refine] mongod: check duplicated fields in create indexes #1568

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11 changes: 11 additions & 0 deletions src/mongo/db/catalog/index_key_validate.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -370,9 +370,20 @@ StatusWith<BSONObj> validateIndexSpec(OperationContext* opCtx, const BSONObj& in

boost::optional<IndexVersion> resolvedIndexVersion;
std::string indexType;
std::set<StringData> fieldsNames;

for (auto&& indexSpecElem : indexSpec) {
auto indexSpecElemFieldName = indexSpecElem.fieldNameStringData();

if (fieldsNames.count(indexSpecElemFieldName)) {
return {ErrorCodes::BadValue,
str::stream() << "The field '" << indexSpecElemFieldName
<< "' appears more than one times in the index specification "
<< indexSpec
};
}
fieldsNames.insert(indexSpecElemFieldName);

if (IndexDescriptor::kKeyPatternFieldName == indexSpecElemFieldName) {
if (indexSpecElem.type() != BSONType::Object) {
return {ErrorCodes::TypeMismatch,
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5 changes: 5 additions & 0 deletions src/mongo/db/catalog/index_key_validate_test.cpp
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Expand Up @@ -526,5 +526,10 @@ TEST(IndexKeyValidateTest, GeoIndexSpecs) {
fromjson("{'key':{'loc':'2dsphere'},'name':'loc_2dsphere','finestIndexedLevel':true,'"
"coarsestIndexedLevel':5}")));
}

TEST(IndexKeyValidateTest, DuplicatedFieldNames) {
ASSERT_NOT_OK(index_key_validate::validateIndexSpec(
nullptr, fromjson("{key: {a: 1}, name: 'index', background: true, background: true}")));
}
} // namespace
} // namespace mongo