afs commented on issue #1614:
URL: https://github.com/apache/jena/issues/1614#issuecomment-1310237230
> I guess, UNION clauses can't also be optimized
The filter is being pushed in - there isn't any reorder of rdf:type (which
is usually assumed to be risky choice).
```
(sequence
(union
(filter (contains (lcase ?itemLabel) "border"@en)
(quadpattern (quad <urn:x-arq:DefaultGraphNode> ?item
<http://www.w3.org/2000/01/rdf-schema#label> ?itemLabel)))
(filter (contains (lcase ?itemLabel) "border"@en)
(quadpattern (quad <urn:x-arq:DefaultGraphNode> ?item
<http://www.w3.org/2004/02/skos/core#altLabel> ?itemLabel))))
(quadpattern (quad <urn:x-arq:DefaultGraphNode> ?item
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://wikiba.se/ontology#Property>)))))
```
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