Technology•September 25, 2017
Gremlin Recipes: 7 – Variables Handling
Duy Hai Doan
aggregate(x).select(x) == store(x).cap(x) == store(x).barrier().select(x)
gremlin>g.V(). has("movie", "title", "Blade Runner"). inE("rated").has("rating", gte(9)).outV(). subgraph("fans_blade_runner") com.datastax.bdp.graph.impl.element.vertex.DsegCachedVertexImpl cannot be cast to org.apache.tinkerpop.gremlin.structure.Edge Type ':help' or ':h' for help. Display stack trace? [yN]JUMP TO SECTION
I KillrVideo dataset
II Variable handling operators
First let’s see how many users have rated Blade Runner more than 9/10:A. store(variable)
B. aggregate(variable)
C. group(variable).by(grouping_axis).by(projection_axis)
D. groupCount(variable).by(grouping_axis)
E. as(label)
F. subgraph(variable)
G. select(variable_or_label)
H. cap(variable)
III In-stream variable
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