Inconsistent BSON path traversal logic

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    • Type: Bug
    • Resolution: Unresolved
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: None
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    • Query Execution
    • ALL
    • QE 2025-09-01, QE 2025-09-15, QE 2025-09-29
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      There are more than one implementation of extracting an element through a dotted path and they don't give the same results.

      Example test:

      TEST_F(ShardKeyPatternTest, RenDotted) {
    auto shardKeyBSON = BSON("a.b.c" << 1);
    ShardKeyPattern shardKeyPattern(shardKeyBSON);
    auto doc = BSON("a" << BSON("b.c" << 1 << "b" << BSON("c" << 2)));

    auto resultUsingInner = BSON("a.b.c" << 2);
    // This one is based on getFieldDottedOrArray in path_internal.cpp
    ASSERT_BSONOBJ_EQ(resultUsingInner, shardKeyPattern.extractShardKeyFromDoc(doc));
    // This one is used by getDocumentKey in op_observer_util.cpp, and this will fail the assertion
    ASSERT_BSONOBJ_EQ(resultUsingInner, bson::extractElementsBasedOnTemplate(doc, shardKeyBSON));
}

            Assignee:
            Alberto Massari
            Reporter:
            Randolph Tan
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              Created:
              Updated: