Tinkerpop 3 M6 Union Step

[Nick DeYoung]

Context 

I'm working on a project where we have a tool that can generate generic germlin traversals from a json representation of the query. 

I'm trying to handle a case where we can 'or' queries together and I'm trying to use the UnionStep to do this. 

However when I have a traversal in the Union Step that has an 'as()' and a 'back()' I get an error: 

g.V().union(g.of().as('IwanttoEmitThese").out("someEdgeLabel").has("someProperty","someValue").back("IwanttoEmitThese"),g.of().has("someProperty2","someValue"))

java.lang.IllegalArgumentException: Side effects do not have a value for provided key: v1

at com.tinkerpop.gremlin.process.Traversal$SideEffects$Exceptions.sideEffectDoesNotExist(Traversal.java:432) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.util.DefaultTraversalSideEffects.get(DefaultTraversalSideEffects.java:103) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.Traverser.get(Traverser.java:91) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.graph.step.map.BackStep.lambda$new$33(BackStep.java:21) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.graph.step.map.BackStep$$Lambda$74/2115737255.apply(Unknown Source) ~[na:na]

at com.tinkerpop.gremlin.process.graph.step.map.MapStep.processNextStart(MapStep.java:27) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.util.AbstractStep.hasNext(AbstractStep.java:105) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.util.DefaultTraversal.hasNext(DefaultTraversal.java:77) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.graph.step.branch.UnionStep.processNextStart(UnionStep.java:30) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.util.AbstractStep.hasNext(AbstractStep.java:105) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.util.ExpandableStepIterator.next(ExpandableStepIterator.java:33) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.graph.step.map.MapStep.processNextStart(MapStep.java:24) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.util.AbstractStep.next(AbstractStep.java:89) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.util.AbstractStep.next(AbstractStep.java:15) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.Traversal.fill(Traversal.java:181) ~[gremlin-core-3.0.0.M6.jar:na]

at com.tinkerpop.gremlin.process.Traversal.toList(Traversal.java:157) ~[gremlin-core-3.0.0.M6.jar:na] 

The Google for "Side effects do not have a value for provided key" 

gave me some results, but this seemed the most pertinent: 

https://github.com/tinkerpop/tinkerpop3/issues/494

Not super helpful to me not sure how to use __ in java on M6 (question 1) i guess if there is an example of this

so I fired up the gremlin console to try do accomplish this in the console: 

Here's what I tried to do in console: 

g = TinkerGraph.open()

marko = g.addVertex(label,"instance","name","marko")

markoSmell = g.addVertex(label,"instance","smellProperty","smelly")

markoSmellAttachment = g.addVertex(label,"instance","name","SmellyPicture")

marko.addEdge("smell",markoSmell)

markoSmell.addEdge("attachment",markoSmellAttachment)

nick = g.addVertex(label,"instance","name","nick")

nickSmell = g.addVertex(label,"instance","smellProperty","sweet")

nick.addEdge("smell",nickSmell)

g.V()

g.E()

g.V().outE("smell")

g.V().out("smell").has("smellProperty","smelly")

g.V().out("smell").outE("attachment")

// anything that has a smell with the smellProperty == 'smelly' or 

// anything that has a smell with the an attachment with the name == 'SmellyPicture'

g.V().out("smell").as("a").union(g.of().has("smellProperty","smelly",g.of().as("b").out("attachment").has("name","SmellyPicture").back("b").back("a")

Here's the console output, see at the end that the console just fails and stops working after executing the traversal with the union 

:( anyone have thoughts?

thanks

// ndy

         \,,,/

         (o o)

-----oOOo-(3)-oOOo-----

plugin activated: tinkerpop.server

plugin activated: tinkerpop.utilities

plugin activated: tinkerpop.tinkergraph

gremlin> g = TinkerGraph.open()

==>tinkergraph[vertices:0 edges:0]

gremlin> marko = g.addVertex(label,"instance","name","marko")

==>v[0]

gremlin> markoSmell = g.addVertex(label,"instance","smellProperty","smelly")

==>v[2]

gremlin> markoSmellAttachment = g.addVertex(label,"instance","name","SmellyPicture")

==>v[4]

gremlin> marko.addEdge("smell",markoSmell)

==>e[6][0-smell->2]

gremlin> markoSmell.addEdge("attachment",markoSmellAttachment)

==>e[7][2-attachment->4]

gremlin> nick = g.addVertex(label,"instance","name","nick")

==>v[8]

gremlin> nickSmell = g.addVertex(label,"instance","smellProperty","sweet")

==>v[10]

gremlin> nick.addEdge("smell",nickSmell)

==>e[12][8-smell->10]

gremlin> g.V()

==>v[0]

==>v[2]

==>v[4]

==>v[8]

==>v[10]

gremlin> g.E()

==>e[6][0-smell->2]

==>e[7][2-attachment->4]

==>e[12][8-smell->10]

gremlin> g.V().outE("smell")

==>e[6][0-smell->2]

==>e[12][8-smell->10]

gremlin> g.V().out("smell").has("smellProperty","smelly")

==>v[2]

gremlin> g.V().out("smell").outE("attachment")

==>e[7][2-attachment->4]

gremlin> g.V().out("smell").as("a").union(g.of().has("smellProperty","smelly",g.of().as("b").out("attachment").has("name","SmellyPicture").back("b").back("a")

gremlin> g

groovysh_parse: 3: expecting ')', found 'g' @ line 3, column 1.

   g

   ^

1 error

Display stack trace? [yN] gn

gremlin> g.V()

groovysh_parse: 3: expecting ')', found 'g' @ line 3, column 1.

   g.V()

   ^

1 error

Display stack trace? [yN] n

gremlin> g

groovysh_parse: 3: expecting ')', found 'g' @ line 3, column 1.

   g

   ^

1 error

Display stack trace? [yN] y

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:

groovysh_parse: 3: expecting ')', found 'g' @ line 3, column 1.

   g

   ^

1 error

at org.codehaus.groovy.control.ErrorCollector.failIfErrors(ErrorCollector.java:309)

at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:106)

at org.codehaus.groovy.control.ErrorCollector.addFatalError(ErrorCollector.java:148)

at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:119)

at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:131)

at org.codehaus.groovy.control.SourceUnit.addError(SourceUnit.java:359)

at org.codehaus.groovy.antlr.AntlrParserPlugin.transformCSTIntoAST(AntlrParserPlugin.java:142)

at org.codehaus.groovy.antlr.AntlrParserPlugin.parseCST(AntlrParserPlugin.java:108)

at org.codehaus.groovy.control.SourceUnit.parse(SourceUnit.java:236)

at org.codehaus.groovy.tools.shell.RigidParser.parse(Parser.groovy:157)

at org.codehaus.groovy.tools.shell.Parser.parse(Parser.groovy:73)

at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:172)

at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:119)

at org.codehaus.groovy.tools.shell.ShellRunner.work(ShellRunner.groovy:94)

at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$work(InteractiveShellRunner.groovy)

at sun.reflect.GeneratedMethodAccessor33.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)

at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)

at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1208)

at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)

at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)

at org.codehaus.groovy.tools.shell.InteractiveShellRunner.work(InteractiveShellRunner.groovy:123)

at org.codehaus.groovy.tools.shell.ShellRunner.run(ShellRunner.groovy:58)

at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$run(InteractiveShellRunner.groovy)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)

at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)

at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1208)

at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)

at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)

at org.codehaus.groovy.tools.shell.InteractiveShellRunner.run(InteractiveShellRunner.groovy:82)

at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)

at com.tinkerpop.gremlin.console.Console.<init>(Console.groovy:95)

at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:636)

at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)

at com.tinkerpop.gremlin.console.Console.main(Console.groovy:248)

gremlin> 

[Nick DeYoung]

g.V().out("smell").as("a").union(g.of().has("smellProperty","smelly"),g.of().as("b").out("attachment").has("name","SmellyPicture")).back("b").back("a")

gives: 

gremlin> g.V().out("smell").as("a").union(g.of().has("smellProperty","smelly"),g.of().as("b").out("attachment").has("name","SmellyPicture")).back("b").back("a")

java.lang.IllegalStateException

Display stack trace? [yN] y

java.lang.IllegalStateException

at com.tinkerpop.gremlin.structure.Graph.of(Graph.java:149)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSite.invoke(PojoMetaMethodSite.java:189)

at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:53)

at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)

at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)

at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)

at groovysh_evaluate.run(groovysh_evaluate:3)

at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)

at org.codehaus.groovy.tools.shell.Interpreter.evaluate(Interpreter.groovy:69)

at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:185)

at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:119)

at org.codehaus.groovy.tools.shell.ShellRunner.work(ShellRunner.groovy:94)

at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$work(InteractiveShellRunner.groovy)

at sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source)

Caused by: java.lang.NullPointerException

at com.tinkerpop.gremlin.structure.Graph.of(Graph.java:147)

... 42 more

[Nick DeYoung]

so my problem was I was not using 3.0.0.M6 gremlin console, 

once I git checkout tags/3.0.0.M6 and mvn clean install -DfeelingLucky and run /bin/gremlin.sh I get this: 

just lin in my Java. 

         \,,,/

         (o o)

-----oOOo-(3)-oOOo-----

gremlin> :plugin list

==>tinkerpop.server

==>tinkerpop.gephi

==>tinkerpop.utilities

==>tinkerpop.sugar

==>tinkerpop.tinkergraph

gremlin> :plugin use tinkerpop.tinkergraph

==>tinkerpop.tinkergraph activated

gremlin> :plugin use tinkerpop.utilities

==>tinkerpop.utilities activated

gremlin> g = TinkerGraph.open()

==>tinkergraph[vertices:0 edges:0]

gremlin> g.addVertex(label,"instance","name","marko")

==>v[0]

gremlin> g.V().union(g.of().as('a').has("name","marko").back('a'))

Side effects do not have a value for provided key: a

Display stack trace? [yN] y

java.lang.IllegalArgumentException: Side effects do not have a value for provided key: a

at com.tinkerpop.gremlin.process.Traversal$SideEffects$Exceptions.sideEffectDoesNotExist(Traversal.java:432)

at com.tinkerpop.gremlin.process.util.DefaultTraversalSideEffects.get(DefaultTraversalSideEffects.java:103)

at com.tinkerpop.gremlin.process.Traverser.get(Traverser.java:91)

at com.tinkerpop.gremlin.process.graph.step.map.BackStep.lambda$new$370(BackStep.java:21)

at com.tinkerpop.gremlin.process.graph.step.map.BackStep$$Lambda$22/1968298538.apply(Unknown Source)

at com.tinkerpop.gremlin.process.graph.step.map.MapStep.processNextStart(MapStep.java:27)

at com.tinkerpop.gremlin.process.util.AbstractStep.hasNext(AbstractStep.java:105)

at com.tinkerpop.gremlin.process.util.DefaultTraversal.hasNext(DefaultTraversal.java:77)

at com.tinkerpop.gremlin.process.graph.step.branch.UnionStep.processNextStart(UnionStep.java:30)

at com.tinkerpop.gremlin.process.util.AbstractStep.hasNext(AbstractStep.java:105)

at com.tinkerpop.gremlin.process.util.DefaultTraversal.hasNext(DefaultTraversal.java:77)

at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)

at com.tinkerpop.gremlin.console.Console$_closure3.doCall(Console.groovy:155)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)

at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)

at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:278)

at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1016)

at org.codehaus.groovy.tools.shell.Groovysh.setLastResult(Groovysh.groovy:370)

at org.codehaus.groovy.tools.shell.Groovysh.this$3$setLastResult(Groovysh.groovy)

at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)

at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:159)

at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:121)

at org.codehaus.groovy.tools.shell.ShellRunner.work(ShellRunner.groovy:93)

at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$work(InteractiveShellRunner.groovy)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)

at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)

at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)

at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)

at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)

at org.codehaus.groovy.tools.shell.InteractiveShellRunner.work(InteractiveShellRunner.groovy:123)

at org.codehaus.groovy.tools.shell.ShellRunner.run(ShellRunner.groovy:57)

at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$run(InteractiveShellRunner.groovy)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)

at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)

at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)

at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)

at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)

at org.codehaus.groovy.tools.shell.InteractiveShellRunner.run(InteractiveShellRunner.groovy:83)

at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)

at com.tinkerpop.gremlin.console.Console.<init>(Console.groovy:99)

at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:636)

at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)

at com.tinkerpop.gremlin.console.Console.main(Console.groovy:252)

gremlin> 

[Daniel Kuppitz]

Hey Nick,

you don't need .back(), you can/should do this instead:

g.V().union(g.of().has("name","marko"), ...)

Cheers,

Daniel

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[Nick DeYoung]

Daniel, 

the example was to show the error. 

For example, 

// keep anything that has an edge 

// or keep anything that has a name marko

g.V().union(g.of().as('retainThis').out().back('retainThis'), g.of().has('name') 

what I'm trying to acomplish with union is 

I want union to take anonymous traversals. If an anonymous traversal contains an .as(),.back() I'm hosed. 

I'm sure this is fixed in M7 or further, but Titan 0.9M1 is on TP3M6 .. 

To view this discussion on the web visit https://groups.google.com/d/msgid/gremlin-users/CA%2Bf9seX0Y%3Ds6dFSQonp81Z5vh2x7kfWJ7nGCJzOk36Uvm4Dx-Q%40mail.gmail.com.

For more options, visit https://groups.google.com/d/optout.

--

// ndy 

[Nick DeYoung]

for more of a concrete example

this JSON

// anything that has a smell with the smellProperty == 'sick' or 

// anything that has a smell with the an attachment with the name == 'SmellyPicture'

{

"smell": {

"or": {

"smellProperty":"sick",

"attachment": {

"name":"SmellyPicture"

}

}

}

}

needs to become this traversal

g.V.as("a").out("smell").union(g.of().has("smellProperty","sick"),g.of().as("b").out("attachment").has("name","SmellyPicture").back("b")).back("a")

but that traversal kabooms

--

// ndy 

[Daniel Kuppitz]

In the current version you can do .has(traversal), but that wasn't possible in M6. As a workaround you can do:

g.V().union(g.of().filter { it.get().out().hasNext() }, g.of().has('name'))

In newer versions simply do:

g.V().union(has(out()), has('name'))

Cheers,

Daniel

To view this discussion on the web visit https://groups.google.com/d/msgid/gremlin-users/CALUY%3DD1pjppCeYZbtq%2B75OMLkB%3DyEPePydXxOmRx1m1f7wnoqw%40mail.gmail.com.