Aklakan opened a new issue, #1397:
URL: https://github.com/apache/jena/issues/1397
### Version
4.6.0-SNAPSHOT
### What happened?
A corner case with OpAsQuery with a failing round trip - detected by
@LorenzBuehmann while trying out the service enhancer plugin #1314 (and blaming
my code for it :innocent:).
It's not high priority but it makes sense to track it nonetheless.
```java
Query origQuery = QueryFactory.create("SELECT * { GRAPH ?g { BIND(?x
AS ?y) }}");
// Structure of pattern: ElementNamedGraph ElementGroup ElementBind
Op origOp = Algebra.compile(origQuery);
Query gotQuery = OpAsQuery.asQuery(origOp);
// Structure of pattern: ElementNamedGraph ElementBind (no
ElementGroup in between)
Op gotOp = Algebra.compile(gotQuery);
```
yields:
```
org.apache.jena.sparql.ARQInternalErrorException: compile(Element)/Not a
structural element: ElementBind
at
org.apache.jena.sparql.algebra.AlgebraGenerator.broken(AlgebraGenerator.java:564)
at
org.apache.jena.sparql.algebra.AlgebraGenerator.compileUnknownElement(AlgebraGenerator.java:170)
at
org.apache.jena.sparql.algebra.AlgebraGenerator.compileElement(AlgebraGenerator.java:156)
```
### Which environment is running?
- [ ] macOS
- [ ] Windows
- [ ] Linux
- [ ] other
### Relevant output and stacktrace
_No response_
### Are you interested in making a pull request?
Maybe
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