In my debugging I saw that the flwor_expr is outside the udf. So when compiling 
a udf, probably the optimizer is changing the expression tree in other places 
as well, probably the caller of the udf, but I cannot say for sure. This 
woulnd't surprise me, it should be normal for an optimizer. 
Your team Zorba Coders is requested to review the proposed merge of 
lp:~danielturcanu/zorba/plan-serializer into lp:zorba.

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