Xpath query is "//[(@test = 't1' or @name = 'Node2' )]/(rep:facet(text))/(rep:facet(name)) order by jcr:path*"
For understanding this error please run the test method "testFacetOnOR()" in attached java file.
In this method 3 nodes are created and properties are set to nodes.
FacetResult should be on the final result set. But FacetResult set is based on result set by first constraint "@test='t1' " .
For more understanding run the test method