在SQLite3场景下，modify column不支持：Error: near MODIFY: syntax error

session_schema.go

@@ -377,8 +377,10 @@ func (session *Session) Sync(beans ...interface{}) error {
                     }
                 }
             } else if col.Comment != oriCol.Comment {
+                if engine.dialect.URI().DBType == schemas.POSTGRES {
                     _, err = session.exec(engine.dialect.ModifyColumnSQL(tbNameWithSchema, col))
                 }
+            }
 
             if col.Default != oriCol.Default {
                 switch {