[iotdb] branch master updated: IOTDB-5610 Don't pipeline cosumeAllNode and consumeOneByOneNode with only one child (#9197)

[xi...@apache.org]

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xiangweiwei pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/iotdb.git


The following commit(s) were added to refs/heads/master by this push:
     new 33cd74962c IOTDB-5610 Don't pipeline cosumeAllNode and consumeOneByOneNode with only one child (#9197)
33cd74962c is described below

commit 33cd74962c5ff8d08b598712fa1293e5ddb63494
Author: Xiangwei Wei <34...@users.noreply.github.com>
AuthorDate: Thu Mar 2 13:45:04 2023 +0800

    IOTDB-5610 Don't pipeline cosumeAllNode and consumeOneByOneNode with only one child (#9197)
---
 .../org/apache/iotdb/db/mpp/plan/planner/OperatorTreeGenerator.java  | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/server/src/main/java/org/apache/iotdb/db/mpp/plan/planner/OperatorTreeGenerator.java b/server/src/main/java/org/apache/iotdb/db/mpp/plan/planner/OperatorTreeGenerator.java
index efbb423fbf..5a3c88a318 100644
--- a/server/src/main/java/org/apache/iotdb/db/mpp/plan/planner/OperatorTreeGenerator.java
+++ b/server/src/main/java/org/apache/iotdb/db/mpp/plan/planner/OperatorTreeGenerator.java
@@ -2346,7 +2346,7 @@ public class OperatorTreeGenerator extends PlanVisitor<Operator, LocalExecutionP
     // children after pipelining
     List<Operator> parentPipelineChildren = new ArrayList<>();
     int finalExchangeNum = context.getExchangeSumNum();
-    if (context.getDegreeOfParallelism() == 1) {
+    if (context.getDegreeOfParallelism() == 1 || node.getChildren().size() == 1) {
       // If dop = 1, we don't create extra pipeline
       for (PlanNode localChild : node.getChildren()) {
         Operator childOperation = localChild.accept(this, context);
@@ -2411,6 +2411,7 @@ public class OperatorTreeGenerator extends PlanVisitor<Operator, LocalExecutionP
           // Otherwise, the first group will belong to the parent pipeline
           if (i == 0) {
             for (int j = startIndex; j < endIndex; j++) {
+              context.setDegreeOfParallelism(1);
               Operator childOperation = node.getChildren().get(j).accept(this, context);
               parentPipelineChildren.add(childOperation);
               afterwardsNodes.add(node.getChildren().get(j));
@@ -2515,7 +2516,7 @@ public class OperatorTreeGenerator extends PlanVisitor<Operator, LocalExecutionP
     int finalExchangeNum = context.getExchangeSumNum();
 
     // 1. divide every child to pipeline using the max dop
-    if (context.getDegreeOfParallelism() == 1) {
+    if (context.getDegreeOfParallelism() == 1 || node.getChildren().size() == 1) {
       // If dop = 1, we don't create extra pipeline
       for (PlanNode childSource : node.getChildren()) {
         Operator childOperation = childSource.accept(this, context);