[JENA-2020] Purpose of EvaluatorSimple and OpExecutor

• Type: Question
• Status: Closed
• Priority: Major
• Resolution: Information Provided
• Component/s: ARQ
• Assignee: Andy Seaborne
• Reporter: Martin Pekár
• Created: 26/Dec/20 11:35
• Updated: 17/Apr/21 17:25
• Resolved: 20/Jan/21 18:15

Description

I am in the midst of adding a new operator in the transformation of OpBGP. I am now trying to implement the execution of the operator in the query plan, but I am now slightly confused about the purpose of EvaluatorSimple used in EvaluatorDispatch and OpExecutor. At the moment, it seems like they are doing the same thing. The difference seems to be that OpExecutor stores the result of applying the operator in a QueryIterator, whereas EvaluatorSimple stores its result in a Table of bindings.

Can someone give me an explanation of purposes of these two classes and how they should be used?