use table dispatcher as the default.

cdc/sink/dmlsink/mq/dispatcher/partition/default.go

@@ -20,22 +20,17 @@ import (
 // DefaultDispatcher is the default partition dispatcher.
 type DefaultDispatcher struct {
 	tbd *TableDispatcher
-	ivd *IndexValueDispatcher
 }
 
 // NewDefaultDispatcher creates a DefaultDispatcher.
 func NewDefaultDispatcher() *DefaultDispatcher {
 	return &DefaultDispatcher{
 		tbd: NewTableDispatcher(),
-		ivd: NewIndexValueDispatcher(),
 	}
 }
 
 // DispatchRowChangedEvent returns the target partition to which
 // a row changed event should be dispatched.
 func (d *DefaultDispatcher) DispatchRowChangedEvent(row *model.RowChangedEvent, partitionNum int32) int32 {
-	if len(row.IndexColumns) != 1 {
-		return d.tbd.DispatchRowChangedEvent(row, partitionNum)
-	}
-	return d.ivd.DispatchRowChangedEvent(row, partitionNum)
+	return d.tbd.DispatchRowChangedEvent(row, partitionNum)
 }