Guo Junshi created TINKERPOP-2487:
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Summary: Add steps to support basic analysis like standard
deviation and percentile
Key: TINKERPOP-2487
URL: https://issues.apache.org/jira/browse/TINKERPOP-2487
Project: TinkerPop
Issue Type: Improvement
Components: process
Reporter: Guo Junshi
When using tinkerpop Gremlin for real use cases, we found that some general
analytical steps are very useful, yet not supported now. Some analytical steps
are general enough to be part of the official gremlin package, e.g. steps to
calculate standard deviation and percentile. The example usage might be:
{code:java}
gremlin> g.V().values('ages')
==>1
==>2
==>3
gremlin> g.V().values('ages').stdev()
==>0.816
gremlin> g.V().values('ages').fold().stdev(Scope.local)
==>0.816
gremlin> g.V().values('ages').percentile(50)
==>2
// one percentile, return single value
gremlin> g.V().values('ages').percentile(0, 100)
==>[0: 1, 100: 3]
// multiple percentiles, return a map{code}
These steps are frequently used in our cases, and we think it would be great to
support them in official versions.
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