script may not define transform such as initial load for queues so no…

… error

add ui

flow/activities/flowable_core.go

@@ -364,13 +364,9 @@ func (a *FlowableActivity) replicateQRepPartition(ctx context.Context,
 			return err
 		}
 		lfn := ls.Env.RawGetString("transformRow")
-		fn, ok := lfn.(*lua.LFunction)
-		if !ok {
-			err := fmt.Errorf("script should define `transformRow` as function, not %s", lfn)
-			a.Alerter.LogFlowError(ctx, config.FlowJobName, err)
-			return err
+		if fn, ok := lfn.(*lua.LFunction); ok {
+			outstream = pua.AttachToStream(ls, fn, stream)
 		}
-		outstream = pua.AttachToStream(ls, fn, stream)
 	}
 
 	var rowsSynced int

ui/app/mirrors/create/helpers/qrep.ts

@@ -123,8 +123,14 @@ export const qrepSettings: MirrorSetting[] = [
         ...curr,
         waitBetweenBatchesSeconds: parseInt(value as string, 10) || 30,
       })),
-    tips: 'Time to wait (in seconds) between getting partitions to process. The default is 30 seconds',
+    tips: 'Time to wait (in seconds) between getting partitions to process. The default is 30 seconds.',
     default: 30,
     type: 'number',
   },
+  {
+    label: 'Script',
+    stateHandler: (value, setter) =>
+      setter((curr: QRepConfig) => ({ ...curr, script: value as string })),
+    tips: 'Script to use for row transformations. The default is no scripting.',
+  },
 ];