OpExecutor (Apache Jena ARQ)

```
public class OpExecutor
extends Object
```
Turn an Op expression into an execution of QueryIterators. Does not consider optimizing the algebra expression (that should happen elsewhere). BGPs are still subject to StageBuilding during iterator execution. During execution, when a substitution into an algebra expression happens (in other words, a streaming operation, index-join-like), there is a call into the executor each time so it does not just happen once before a query starts.

Methods
Modifier and Type	Method and Description
`static QueryIterator`	`createRootQueryIterator(ExecutionContext execCxt)`
`QueryIterator`	`executeOp(Op op, QueryIterator input)`

public QueryIterator executeOp(Op op,
                      QueryIterator input)

public static QueryIterator createRootQueryIterator(ExecutionContext execCxt)

Class OpExecutor