dialect/sql/schema: qualify if schema is given (#4346)

dialect/sql/schema/atlas.go

@@ -937,10 +937,6 @@ func (a *Atlas) realm(tables []*Table) (*schema.Realm, error) {
 	ss := slices.SortedFunc(maps.Values(sm), func(a, b *schema.Schema) int {
 		return strings.Compare(a.Name, b.Name)
 	})
-	// In case there only is one schema, do not qualify the schema name.
-	if len(ss) == 1 {
-		ss[0].Name = ""
-	}
 	return &schema.Realm{Schemas: ss}, nil
 }
 

dialect/sql/schema/schema_test.go

@@ -325,5 +325,12 @@ CREATE VIEW $pets_without_fur$ ($id$, $name$, $owner_id$) AS SELECT id, name, ow
 			require.NoError(t, err)
 			require.Equal(t, tt.expected, ac)
 		})
+		t.Run(n+" single schema", func(t *testing.T) {
+			ac, err := Dump(context.Background(), tt.dialect, tt.version, tables[0:1])
+			require.NoError(t, err)
+			if tt.dialect != dialect.SQLite {
+				require.True(t, strings.HasPrefix(ac, "-- Add new schema named \"s1\""), strings.Split(ac, "\n")[0])
+			}
+		})
 	}
 }