AQL+ is a superset of AQL and were used to generate multi-stages fuzzy-join plan during the optimization. The current issues and refactoring proposal can be found in the following document. 

https://docs.google.com/presentation/d/1_y1jtxms3qff4Pm5VHf8YHq-DZaknLNS4oD93y0KtDM/edit?usp=sharing

 

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