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Posted to dev@hugegraph.apache.org by "contrueCT (via GitHub)" <gi...@apache.org> on 2026/08/22 07:22:09 UTC
[I] [Bug] HugePrimaryKeyStrategy silently converts vertex-property metadata into vertex properties [hugegraph]
contrueCT opened a new issue, #3165:
URL: https://github.com/apache/hugegraph/issues/3165
### Bug Type (问题类型)
gremlin (unexpected result)
### Before submit
- [x] I searched the existing issues and did not find the same problem.
### Environment (环境信息)
- HugeGraph Server: current `apache/hugegraph` `master` at [`431f6e6b`](https://github.com/apache/hugegraph/commit/431f6e6b431014feb5b50d27ea67180b4610f10b)
- TinkerPop: 3.5.1
- Backend: backend-independent; the incorrect rewrite happens in a traversal strategy before the vertex is written
### Expected and actual behavior (期望与实际表现)
`HugePrimaryKeyStrategy` folds a single-cardinality `AddPropertyStep` immediately following `addV()` into the vertex-creation step.
For this traversal:
```groovy
g.addV("person").
property("name", "marko", "country", "cn")
```
TinkerPop treats `country=cn` as a meta-property attached to the `name` vertex property. It does not treat `country` as a sibling property of the vertex.
HugeGraph currently reports `supportsMetaProperties() == false`, and `HugeVertex.property(...)` explicitly throws `VertexProperty.Exceptions.metaPropertiesNotSupported()` when meta-properties are passed. The expected behavior is therefore an explicit rejection.
The optimization changes that behavior. `HugePrimaryKeyStrategy` copies every `AddPropertyStep` parameter other than `T.key` and `T.value` into the `addV()` configuration, then removes the original `AddPropertyStep`. If `country` is also a valid schema property, HugeGraph can silently create an ordinary vertex property `country=cn` instead of rejecting the unsupported meta-property.
This is a data-semantics problem because an unsupported construct is accepted with a different meaning.
### Minimal reproduction
Create a schema in which both keys are valid ordinary vertex properties:
```groovy
schema = graph.schema()
schema.propertyKey("name").asText().create()
schema.propertyKey("country").asText().create()
schema.vertexLabel("person").
properties("name", "country").
primaryKeys("name").
create()
```
Run the traversal and inspect the resulting vertex:
```groovy
g.addV("person").
property("name", "marko", "country", "cn").
iterate()
g.V().hasLabel("person").has("name", "marko").valueMap(true)
```
Expected:
- The write is rejected with `metaPropertiesNotSupported()`.
- `country=cn` is never stored as an ordinary vertex property.
Actual on the affected strategy path:
- The `AddPropertyStep` is removed.
- `country=cn` is folded into the vertex-creation step as an ordinary vertex property.
A strategy-level reproduction shows the rewritten traversal as:
```text
AddVertexStartStep({country=[cn], label=[person], name=[marko]})
```
### Source analysis
- [TinkerPop 3.5.1 `AddPropertyStep`](https://github.com/apache/tinkerpop/blob/3.5.1/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/AddPropertyStep.java#L93-L99) separates `T.key` and `T.value` from the remaining vertex-property key/value pairs, then passes the remaining pairs to `Vertex.property(...)` as meta-properties.
- [HugeGraph declares that meta-properties are unsupported](https://github.com/apache/hugegraph/blob/431f6e6b431014feb5b50d27ea67180b4610f10b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/structure/HugeFeatures.java#L261-L265).
- [`HugeVertex.property(...)` rejects them](https://github.com/apache/hugegraph/blob/431f6e6b431014feb5b50d27ea67180b4610f10b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/structure/HugeVertex.java#L436-L444).
- [`HugePrimaryKeyStrategy` changes the remaining pairs into `addV()` parameters](https://github.com/apache/hugegraph/blob/431f6e6b431014feb5b50d27ea67180b4610f10b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/optimize/HugePrimaryKeyStrategy.java#L75-L98).
The strategy was introduced in [`4b74ab6c`](https://github.com/apache/hugegraph/commit/4b74ab6cec4a8357dd6a8feef4e3c9ea616fa52f) in March 2023. The same behavior is still present on the current public `master` branch. It was noticed while reviewing a TinkerPop 3.8.1 adaptation, but it is not introduced by that upgrade.
### Suggested fix and acceptance criteria
When an `AddPropertyStep` contains vertex-property metadata, `HugePrimaryKeyStrategy` should not fold that step into `addV()`. Leaving the step in place preserves the existing explicit rejection from `HugeVertex.property(...)`.
A regression test should verify that:
1. The traversal above throws the unsupported-meta-property exception.
2. The metadata key is never written as an ordinary vertex property.
3. Normal `addV().property(key, value)` folding still works.
4. Both `AddVertexStartStep` and mid-traversal `AddVertexStep` paths preserve the same behavior.
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Re: [I] [Bug] HugePrimaryKeyStrategy silently converts vertex-property metadata into vertex properties [hugegraph]
Posted by "dosubot[bot] (via GitHub)" <gi...@apache.org>.
dosubot[bot] commented on issue #3165:
URL: https://github.com/apache/hugegraph/issues/3165#issuecomment-5378995789
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<!-- Answer -->
Good catch — the bug analysis is accurate and well-traced. Here's a quick confirmation from the code:
In `HugePrimaryKeyStrategy.apply()`, when processing an `AddPropertyStep`, any parameters that are neither `T.key` nor `T.value` are collected into `kvList` and passed directly to `curAddStep.configure(...)` [[1]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/traversal/optimize/HugePrimaryKeyStrategy.java#L81-L96). This is the folding that silently promotes meta-property pairs into ordinary vertex properties on the `AddVertexStartStep` / `AddVertexStep`.
Meanwhile, `HugeVertex.property(...)` correctly throws `metaPropertiesNotSupported()` when `objects.length != 0` [[2]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/structure/HugeVertex.java#L442-L443) — but the strategy removes the `AddPropertyStep` entirely before `HugeVertex.property()` is ever called, so that guard is never reached.
**The fix is straightforward**: in the `else` branch of the `T.key`/`T.value` forEach (lines 86–89), instead of accumulating `kvList` and folding it in, the strategy should bail out and **not** add the step to `removeSteps` — leaving the original `AddPropertyStep` in place so that `HugeVertex.property(...)` can reject it at execution time. Concretely:
```java
propertyStep.getParameters().getRaw().forEach((k, v) -> {
if (T.key.equals(k)) {
kvs[0] = v.get(0);
} else if (T.value.equals(k)) {
kvs[1] = v.get(0);
} else {
// meta-property detected — mark step as non-foldable
kvList.add(k.toString());
kvList.add(v.get(0));
}
});
if (!kvList.isEmpty()) {
// Don't fold; leave the step so HugeVertex.property() rejects it
curAddStep = null;
continue;
}
curAddStep.configure(kvs);
removeSteps.add(step);
```
This preserves the existing `metaPropertiesNotSupported()` exception path without any additional feature logic, and normal `addV().property(key, value)` folding (where `kvList` is empty) is unaffected.
Your four regression test criteria (exception thrown, no side-write, normal folding still works, both `AddVertexStartStep` and `AddVertexStep` paths covered) are exactly the right test surface.
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Re: [I] [Bug] HugePrimaryKeyStrategy silently converts vertex-property metadata into vertex properties [hugegraph]
Posted by "imbajin (via GitHub)" <gi...@apache.org>.
imbajin closed issue #3165: [Bug] HugePrimaryKeyStrategy silently converts vertex-property metadata into vertex properties
URL: https://github.com/apache/hugegraph/issues/3165
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