Lei Tang created TINKERPOP-2933:
-----------------------------------
Summary: LazyBarrierStrategy affects the output order of query
result
Key: TINKERPOP-2933
URL: https://issues.apache.org/jira/browse/TINKERPOP-2933
Project: TinkerPop
Issue Type: Bug
Reporter: Lei Tang
I find that when I remove `LazyBarrierStrategy`, sometimes the output order of
query result can be changed. I don't know whether it is a correct behavior,
but it sometimes can affect the query result, e.g., a `range()` or `limit()` in
a query.
For example, I can get the consistent result with the following queries.
{code:java}
gremlin> :>
g.withoutStrategies(LazyBarrierStrategy).V().out('el0','el1').has('vp1',
lt(0.30755568))
==>v[98]
==>v[14]
==>v[94]
gremlin> :> g.V().out('el0','el1').has('vp1', lt(0.30755568))
==>v[98]
==>v[14]
==>v[94]
{code}
However, I retrieved a different order of results with the following two
queries. I think they should also execute the same query results, as well as
the same order.
{code:java}
gremlin> :> g.V().out('el0','el1').not(__.has('vp1', lt(0.30755568)))
==>v[78]
==>v[35]
==>v[103]
==>v[103]
==>v[80]
==>v[80]
==>v[50]
gremlin> :>
g.withoutStrategies(LazyBarrierStrategy).V().out('el0','el1').not(__.has('vp1',
lt(0.30755568)))
==>v[78]
==>v[35]
==>v[103]
==>v[80]
==>v[103]
==>v[80]
==>v[50]
{code}
Thus, if I have some other operations after it, I will get different query
results.
{code:java}
gremlin> :>
g.withoutStrategies(LazyBarrierStrategy).V().out('el0','el1').not(__.has('vp1',
lt(0.30755568))).tail(3)
==>v[103]
==>v[80]
==>v[50]
gremlin> :> g.V().out('el0','el1').not(__.has('vp1', lt(0.30755568))).tail(3)
==>v[80]
==>v[80]
==>v[50]
{code}
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