[
https://issues.apache.org/jira/browse/TINKERPOP-1312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15303040#comment-15303040
]
ASF GitHub Bot commented on TINKERPOP-1312:
-------------------------------------------
Github user okram commented on a diff in the pull request:
https://github.com/apache/incubator-tinkerpop/pull/320#discussion_r64829335
--- Diff:
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/process/traversal/strategy/optimization/RangeByIsCountStrategyTest.java
---
@@ -142,6 +142,7 @@ public void doTest(final Traversal traversal, final
Traversal optimized) {
{__.out().count().is(without(2, 6, 4)),
__.out().limit(6).count().is(without(2, 6, 4))},
{__.map(__.count().is(0)),
__.map(__.limit(1).count().is(0))},
{__.flatMap(__.count().is(0)),
__.flatMap(__.limit(1).count().is(0))},
+ {__.filter(__.count().is(0)),
__.filter(__.not(__.identity()))},
--- End diff --
`filter(not(_.identity))` the same as `not()` ?
> .count().is(0) is not properly optimized
> ----------------------------------------
>
> Key: TINKERPOP-1312
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1312
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.2.0-incubating, 3.1.2-incubating
> Reporter: Daniel Kuppitz
> Assignee: Daniel Kuppitz
> Fix For: 3.1.3, 3.2.1
>
>
> {{bla.count().is(0)}} gets optimized by {{RangeByIsCountStrategy}}, which
> replaces it with {{bla.limit(1).count().is(0)}}. That's good, but we can do
> even better by replacing it with {{__.not(bla)}}, which is a simple
> {{.hasNext()}} instead of a {{RangeStep}} followed by a
> {{ReducingBarrierStep}} ({{count()}}).
> Question is: should we do the replacement in {{RangeByIsCountStrategy}}? The
> strategy will recognize the pattern, no matter if we use it for the
> replacement or not; it's just that the strategy name is then no longer in
> line with the the actual replacement (for this particular {{.count().is(0)}}
> case) as it won't inject a {{RangeStep}}.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
