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https://issues.apache.org/jira/browse/TINKERPOP3-670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14544605#comment-14544605
]
ASF GitHub Bot commented on TINKERPOP3-670:
-------------------------------------------
Github user mhfrantz commented on the pull request:
https://github.com/apache/incubator-tinkerpop/pull/61#issuecomment-102197382
Yes, I see both SparkGraphComputerProcessIntegrateTest and
GiraphGraphComputerProcessIntegrateTest mentioned in the test output. I'm
using the GREMLIN_TESTS env var to run only the `tail` and `range` tests. Most
of them are skipped by `ComputerVerificationStrategy`, but the one that you
asked me to add does run on both Spark and Giraph:
```
...
Testing: g_V_repeatXbothX_timesX3X_tailX7X
...
Tests run: 18, Failures: 0, Errors: 0, Skipped: 12, Time elapsed: 24.016
sec - in
org.apache.tinkerpop.gremlin.hadoop.process.computer.giraph.GiraphGraphComputerProcessIntegrateTest
...
Testing: g_V_repeatXbothX_timesX3X_tailX7X
...
Tests run: 18, Failures: 0, Errors: 0, Skipped: 12, Time elapsed: 12.464
sec - in
org.apache.tinkerpop.gremlin.hadoop.process.computer.spark.SparkGraphComputerProcessIntegrateTest
```
Also, the same selected tinkergraph-gremlin tests still pass.
```
Tests run: 18, Failures: 0, Errors: 0, Skipped: 12, Time elapsed: 1.115 sec
- in
org.apache.tinkerpop.gremlin.tinkergraph.process.TinkerGraphProcessComputerTest
...
Tests run: 18, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.138 sec
- in
org.apache.tinkerpop.gremlin.tinkergraph.process.TinkerGraphProcessStandardTest
```
> tail step
> ---------
>
> Key: TINKERPOP3-670
> URL: https://issues.apache.org/jira/browse/TINKERPOP3-670
> Project: TinkerPop 3
> Issue Type: Improvement
> Components: process
> Reporter: Matt Frantz
>
> The tail step has two scopes:
> * global: emits the last N traversers that pass through it.
> * local: emits a {{List}} containing the last N elements of the inbound
> {{List}}
> Additionally, for {{tail(local, 1)}}, it emits a single element rather than a
> {{List}} containing a single element.
> TINKERPOP3-639 provides motivation.
> Scenario: Global scope
> {noformat}
> gremlin> g.V().order().by(T.id, incr).tail(global, 2)
> ==>v[5]
> ==>v[6]
> {noformat}
> Scenario: Default scope is global
> {noformat}
> gremlin> g.V().order().by(T.id, incr).tail(2)
> ==>v[5]
> ==>v[6]
> {noformat}
> Scenario: Local scope, {{List}} input, N>1
> {noformat}
> gremlin> g.V().as('a').out().as('a').out().as('a').select('a').tail(local, 2)
> ==>[v[4], v[5]]
> ==>[v[4], v[3]]
> {noformat}
> Scenario: Local scope, {{List}} input, N=1
> {noformat}
> gremlin> g.V().as('a').out().as('a').out().as('a').select('a').tail(local, 1)
> ==>v[5]
> ==>v[3]
> {noformat}
> Scenario: Local scope, {{Map}} input, N>1
> {noformat}
> gremlin> g.V().as('a').out().as('b').out().as('c').select().tail(local, 2)
> ==>[b:v[4], c:v[5]]
> ==>[b:v[4], c:v[3]]
> {noformat}
> Scenario: Local scope, {{Map}} input, N=1
> {noformat}
> gremlin> g.V().as('a').out().as('b').out().as('c').select().tail(local, 1)
> ==>[c:v[5]]
> ==>[c:v[3]]
> {noformat}
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