Search: fix PostgreSQL query (#45305) (#45780)

* Search: fix PostgreSQL query

* Apply suggestion from code review

(cherry picked from commit 5a1d8cbea7)

Co-authored-by: Sofia Papagiannaki <1632407+papagian@users.noreply.github.com>

pkg/services/sqlstore/searchstore/builder.go

@@ -115,15 +115,31 @@ func (b *Builder) applyFilters() (ordering string) {
 		b.params = append(b.params, whereParams...)
 	}
 
-	if len(groups) > 0 {
-		b.sql.WriteString(fmt.Sprintf(" GROUP BY %s", strings.Join(groups, ", ")))
-		b.params = append(b.params, groupParams...)
-	}
-
 	if len(orders) < 1 {
 		orders = append(orders, TitleSorter{}.OrderBy())
 	}
 
+	if len(groups) > 0 {
+		cols := make([]string, 0, len(orders)+len(groups))
+		for _, o := range orders {
+			o := strings.TrimSuffix(o, " DESC")
+			o = strings.TrimSuffix(o, " ASC")
+			exists := false
+			for _, g := range groups {
+				if g == o {
+					exists = true
+					break
+				}
+			}
+			if !exists {
+				cols = append(cols, o)
+			}
+		}
+		cols = append(cols, groups...)
+		b.sql.WriteString(fmt.Sprintf(" GROUP BY %s", strings.Join(cols, ", ")))
+		b.params = append(b.params, groupParams...)
+	}
+
 	orderBy := fmt.Sprintf(" ORDER BY %s", strings.Join(orders, ", "))
 	b.sql.WriteString(orderBy)