:or: filter does not work in combination with :uri: filter

[x-m-el]

When using the :or: filter and one of them is a :uri: filter, the created query internally will not be correct.

e.g. for filter[:or:][:uri:]=test&filter[:or:][:exact:alias]=test the query is:

SELECT DISTINCT ?uuid WHERE {
    GRAPH <http://mu.semte.ch/application> {
    ?s mu:uuid ?uuid; a ?class. VALUES ?class {void:Dataset}. 
{
 VALUES ?s { <test> } 
}  UNION 
{
  ?s ext:alias """test""".
} } } GROUP BY ?uuid OFFSET 0 LIMIT 20

This problem arises from using the VALUES block:
https://www.w3.org/TR/sparql11-query/#inline-data

VALUES provides inline data as a solution sequence which are combined with the results of query evaluation by a join operation.

A potential solution that works as expected would be

PREFIX mu: <http://mu.semte.ch/vocabularies/core/>
PREFIX ext: <http://mu.semte.ch/vocabularies/ext/>
PREFIX void: <http://rdfs.org/ns/void#>

SELECT DISTINCT ?uuid WHERE {
  GRAPH <http://mu.semte.ch/application> {
    ?s mu:uuid ?uuid; a ?class. VALUES ?class {void:Dataset}. 
    {
      { SELECT ?s WHERE { VALUES ?s { <test> }  } }
    } UNION {
      ?s ext:alias """test""".
    }
  }
} GROUP BY ?uuid OFFSET 0 LIMIT 20

or using a FILTER instead of VALUES (but this would be slower).