Skip order sql when quering with distinct

scope.go

@@ -734,7 +734,7 @@ func (scope *Scope) selectSQL() string {
 }
 
 func (scope *Scope) orderSQL() string {
-	if len(scope.Search.orders) == 0 || scope.Search.countingQuery {
+	if len(scope.Search.orders) == 0 || scope.Search.ignoreOrderQuery {
 		return ""
 	}
 
@@ -927,7 +927,7 @@ func (scope *Scope) count(value interface{}) *Scope {
 	if query, ok := scope.Search.selects["query"]; !ok || !regexp.MustCompile("(?i)^count(.+)$").MatchString(fmt.Sprint(query)) {
 		scope.Search.Select("count(*)")
 	}
-	scope.Search.countingQuery = true
+	scope.Search.ignoreOrderQuery = true
 	scope.Err(scope.row().Scan(value))
 	return scope
 }

search.go

@@ -1,6 +1,9 @@
 package gorm
 
-import "fmt"
+import (
+	"fmt"
+	"regexp"
+)
 
 type search struct {
 	db               *DB
@@ -21,7 +24,7 @@ type search struct {
 	tableName        string
 	raw              bool
 	Unscoped         bool
-	countingQuery    bool
+	ignoreOrderQuery bool
 }
 
 type searchPreload struct {
@@ -70,7 +73,13 @@ func (s *search) Order(value interface{}, reorder ...bool) *search {
 	return s
 }
 
+var distinctSQLRegexp = regexp.MustCompile(`(?i)distinct[^a-z]+[a-z]+`)
+
 func (s *search) Select(query interface{}, args ...interface{}) *search {
+	if distinctSQLRegexp.MatchString(fmt.Sprint(query)) {
+		s.ignoreOrderQuery = true
+	}
+
 	s.selects = map[string]interface{}{"query": query, "args": args}
 	return s
 }