I am going to approve, but it would be nice if you added an "iter" test to make sure that the optimization is applied and we won't loose it somehow in the future. To do so, you must first make PrinterVisitor print theNeedToCpy data member of the various ZorbaInsertNodesXXX iterators. This will probably involve messing with the runtime code generator (ouch!). Then you print the iterators plan of your no_copy_01.xq, and save it in test/rbkt/ExpCompilerResults/IterPlans/zorba/collections/no_copy_01.iter.
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