Support Spanner's UNION syntax, which needs to be UNION DISTINCT or UNION ALL. (#101768)

* Support Spanner's UNION syntax, which needs to be UNION DISTINCT or UNION ALL.

pkg/services/accesscontrol/database/database.go

@@ -6,9 +6,10 @@ import (
 	"strconv"
 	"strings"
 
+	"go.opentelemetry.io/otel"
+
 	"github.com/grafana/grafana/pkg/infra/db"
 	"github.com/grafana/grafana/pkg/services/accesscontrol"
-	"go.opentelemetry.io/otel"
 )
 
 var tracer = otel.Tracer("github.com/grafana/grafana/pkg/services/accesscontrol/database")
@@ -58,7 +59,7 @@ func (s *AccessControlStore) GetUserPermissions(ctx context.Context, query acces
 			return nil
 		}
 
-		filter, params := accesscontrol.UserRolesFilter(query.OrgID, query.UserID, query.TeamIDs, query.Roles)
+		filter, params := accesscontrol.UserRolesFilter(query.OrgID, query.UserID, query.TeamIDs, query.Roles, s.sql.GetDialect())
 
 		q := `
 		SELECT