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https://issues.apache.org/jira/browse/TINKERPOP-1932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16417214#comment-16417214
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stephen mallette commented on TINKERPOP-1932:
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hmm....I don't know if {{inject()}} preserves order....that's a separate issue
i think. that's probably a good question to send to the gremlin-users mailing
list:
normally, you should not rely on a traversal to preserve order though.
different graph databases handle that in their own ways. since i always tend to
assume that when i write traversals i never thought of how {{inject()}} should
behave.
> Traversal results are implicitly deduplicated when using bytecode
> -----------------------------------------------------------------
>
> Key: TINKERPOP-1932
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1932
> Project: TinkerPop
> Issue Type: Bug
> Components: process
> Affects Versions: 3.3.1
> Reporter: Dimitry Solovyov
> Priority: Major
>
> Sending the same query as Gremlin-Groovy and as bytecode yields different
> results, if the result set contains duplicates. Duplicates are preserved in
> results from StandardOpProcessor, but dropped in TraversalOpProcessor.
> Deduplication seems to happen when traversers are bulked using a
> [TraverserSet|https://github.com/apache/tinkerpop/blob/3.3.1/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/traverser/util/TraverserSet.java]
> in
> [TraverserIterator|https://github.com/apache/tinkerpop/blob/3.3.1/gremlin-server/src/main/java/org/apache/tinkerpop/gremlin/server/util/TraverserIterator.java].
> TraverserSet intentionally collects traversers in a hash map.
> Here is a test that reproduces the issue:
> {code:java}
> Client groovyClient = Cluster.open().connect();
> List<Long> groovyResult = groovyClient.submit("g.inject(1,
> 1)").stream().map(Result::getLong).collect(toList());
> groovyClient.close();
> Client bytecodeClient = Cluster.open().connect().alias("g");
> Bytecode bytecode = __.inject(1, 1).asAdmin().getBytecode();
> List<Long> bytecodeResult =
> bytecodeClient.submit(bytecode).stream().map(Result::getLong).collect(toList());
> bytecodeClient.close();
> assertEquals(groovyResult, asList(1L, 1L));
> assertEquals(bytecodeResult, asList(1L, 1L));
> {code}
>
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