asterix-graphix/src/main/java/org/apache/asterix/graphix/lang/rewrite/lower/EnvironmentActionFactory.java [574:581]:
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                    loweringEnvironment.acceptTransformer(lowerList -> {
                        VariableExpr edgeJoinExpr = aliasLookupTable.getJoinAlias(edgeVar);
                        VariableExpr edgeJoinCopy = graphixDeepCopyVisitor.visit(edgeJoinExpr, null);
                        VariableExpr iterationVarCopy1 = graphixDeepCopyVisitor.visit(iterationVar, null);
                        VariableExpr iterationVarCopy2 = graphixDeepCopyVisitor.visit(iterationVar, null);
                        Expression vertexEdgeJoin = buildVertexEdgeJoin(
                                buildAccessorList(iterationVarCopy1, elementLookupTable.getVertexKey(vertexIdentifier)),
                                buildAccessorList(edgeJoinCopy, edgeKeyAccess.apply(edgeIdentifier)));
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asterix-graphix/src/main/java/org/apache/asterix/graphix/lang/rewrite/lower/EnvironmentActionFactory.java [657:664]:
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                loweringEnvironment.acceptTransformer(lowerList -> {
                    VariableExpr edgeJoinExpr = aliasLookupTable.getJoinAlias(edgeVar);
                    VariableExpr edgeJoinCopy = graphixDeepCopyVisitor.visit(edgeJoinExpr, null);
                    VariableExpr iterationVarCopy1 = graphixDeepCopyVisitor.visit(iterationVar, null);
                    VariableExpr iterationVarCopy2 = graphixDeepCopyVisitor.visit(iterationVar, null);
                    Expression vertexEdgeJoin = buildVertexEdgeJoin(
                            buildAccessorList(iterationVarCopy1, elementLookupTable.getVertexKey(vertexIdentifier)),
                            buildAccessorList(edgeJoinCopy, edgeKeyAccess.apply(edgeIdentifier)));
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