new graph traversal step ?

[David]

I want to propose a new "step" but am unsure if the idea is any good for a variety of reasons -
not the least of which is does it fit with the "philosophy" of tinkerpop 3 query patterns.

But I figured it was at least worth posting for the discussion if nothing else.

I am working on projects that require temporal constructs in graphs.
Rather than filtering at every vertex/edge myself, in the gremlin code, I'd
like to have a way to specify that up front in the query - maybe something
like this:

g.V().at('since',  T.lt, '1424373806298', Vertex).rest of traversal here()

and have the parameters specified in the "at" be applied for the entire traversal - like
a universal time filter that will look at the 'since' property in my graph (or whatever
field might be supplied in the at() step.

I don't particularly like at() as the step name, the idea coming from the:
"it happened at() this time" thought.... but the name isn't important.

There could be different parameters for the at() step - where the property in the
specific graph can be specified, as well as some way to suggest "check the vertices",
"check the edges",  "check vertices and edges",  have the specific graph property
match, be less than, greater than, etc.

I could use something like a partition graph (or similar thing) to accomplish this -
but that seems heavier and not as friendly, especially if I want to run several
queries over different time periods back to back.

...fire away ;-)

[Daniel Kuppitz]

Hi David,

you could write your own strategy, similar to PartitionGraphStrategy. E.g.:

s = GlobalFilterStrategy.build().filter("since", T.lt, 123).create()

sg = g.strategy(strategy)

sg.V().... // all elements filtered by 'since < 123'

strategy.setFilter("since", T.lt, System.currentTimeMillis())

sg.V().... // all elements filtered by 'since < now'

A new step wouldn't be sufficient IMO.

Cheers,

Daniel

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[David]

Thanks Daniel.  Let me give that a try.