HappenLee commented on code in PR #19238:
URL: https://github.com/apache/doris/pull/19238#discussion_r1185658656


##########
fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java:
##########
@@ -479,7 +480,7 @@ public class SessionVariable implements Serializable, 
Writable {
      * 1 means disable this feature
      */
     @VariableMgr.VarAttr(name = PARALLEL_FRAGMENT_EXEC_INSTANCE_NUM, fuzzy = 
true)
-    public int parallelExecInstanceNum = 1;
+    public int parallelExecInstanceNum = 0;

Review Comment:
   we need a new session variable to set pipeline parallel



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