[joern-users] Some notes on gremlin v2/v3 differences
joernusers at timit.nl
Mon Oct 31 17:51:27 CET 2016
On Mon, Oct 31, 2016 at 03:25:58PM +0000, Vlad Tsyrklevich via joern-users wrote:
> I was playing with the octopus dev version a bit and it took me quite a
> while to figure out how to perform some simple operations that I knew
> how to do with gremlin v2. I wrote up some notes for my future self
> that others might find useful if they want to play with
> octopus: https://tsyrklevich.net/2016/10/31/notes-on-octopus-gremlin
> 1. https://tsyrklevich.net/2016/10/31/notes-on-octopus-gremlin3/
Getting from Gremlin2 to Gremlin3 is not an easy change. The syntax has changed,
but mostly for the better. The new steps allow more optimizations and rely less
on side-effect steps.
Specifically, the _match, flatMap and filter steps all take closures that are
difficult to optimize. Instead, you can use steps like
I am working on a tutorial for learning Gremlin3 with Joern/Octopus:
You will need to build it with sphinx.
Hopefully this will give you some help when experimenting with Gremlin queries.
If you like unit tests, there is a simple unit test framework that I wrote for
testing Gremlin queries. It has helped me to discover some bugs in queries
Comments and suggestions are welcome.
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