[pipeline](exec) disable pipeline load in master code (#23061)

disable pipeline load in master code

fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java

@@ -322,7 +322,7 @@ public class Coordinator {
         this.enableShareHashTableForBroadcastJoin = context.getSessionVariable().enableShareHashTableForBroadcastJoin;
         // Only enable pipeline query engine in query, not load
         this.enablePipelineEngine = context.getSessionVariable().getEnablePipelineEngine()
-                && fragments.size() > 0;
+                && (fragments.size() > 0 && fragments.get(0).getSink() instanceof ResultSink);
         initQueryOptions(context);
 
         setFromUserProperty(context);