Aklakan opened a new issue, #2412:
URL: https://github.com/apache/jena/issues/2412
### Version
5.1.0-SNAPSHOT
### What happened?
The following two variants incorrectly return 1 binding whereas 0 would be
expected.
The reason is that JoinClassifier.isLinear returns true because VarFinder
does not consider the unbound values.
```sparql
SELECT * {
VALUES ?x {
0
}
{
VALUES ?x {
UNDEF
}
FILTER(bound(?x))
}
}
```
```sparql
SELECT * {
BIND(0 AS ?x)
{
BIND(coalesce() AS ?x)
FILTER(bound(?x))
}
}
```
### Relevant output and stacktrace
_No response_
### Are you interested in making a pull request?
Yes
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