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new 53814e466b [Enhancement](Nereids)optimize merge group in memo #13900
53814e466b is described below
commit 53814e466b67e40a7f8656484c6fe38c9040d369
Author: mch_ucchi <41606806+sohardforan...@users.noreply.github.com>
AuthorDate: Wed Nov 2 20:42:55 2022 +0800
[Enhancement](Nereids)optimize merge group in memo #13900
---
.../apache/doris/nereids/memo/GroupExpression.java | 23 +++++++++++++++++++---
.../java/org/apache/doris/nereids/memo/Memo.java | 23 +++++-----------------
2 files changed, 25 insertions(+), 21 deletions(-)
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/nereids/memo/GroupExpression.java
b/fe/fe-core/src/main/java/org/apache/doris/nereids/memo/GroupExpression.java
index 92067f607d..1972e71961 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/nereids/memo/GroupExpression.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/nereids/memo/GroupExpression.java
@@ -28,6 +28,7 @@ import org.apache.doris.statistics.StatsDeriveResult;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableList.Builder;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
@@ -106,7 +107,9 @@ public class GroupExpression {
}
public void setChildren(ImmutableList<Group> children) {
+ this.children.forEach(g -> g.removeParentExpression(this));
this.children = children;
+ this.children.forEach(g -> g.addParentExpression(this));
}
/**
@@ -117,22 +120,36 @@ public class GroupExpression {
*/
public void replaceChild(Group originChild, Group newChild) {
originChild.removeParentExpression(this);
+ List<Group> groups =
Lists.newArrayListWithCapacity(this.children.size());
for (int i = 0; i < children.size(); i++) {
if (children.get(i) == originChild) {
- children.set(i, newChild);
- newChild.addParentExpression(this);
+ groups.add(newChild);
+ } else {
+ groups.add(child(i));
}
}
+ children = ImmutableList.copyOf(groups);
+ newChild.addParentExpression(this);
}
public void setChild(int index, Group group) {
- this.children.set(index, group);
+ this.children.get(index).removeParentExpression(this);
+ setChildByIndex(index, group);
}
public boolean hasApplied(Rule rule) {
return ruleMasks.get(rule.getRuleType().ordinal());
}
+ private void setChildByIndex(int index, Group group) {
+ ImmutableList.Builder<Group> builder = new Builder<>();
+ builder.addAll(children.subList(0, index));
+ builder.add(group);
+ builder.addAll(children.subList(index + 1, children.size()));
+ children = builder.build();
+ group.addParentExpression(this);
+ }
+
public boolean notApplied(Rule rule) {
return !hasApplied(rule);
}
diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/memo/Memo.java
b/fe/fe-core/src/main/java/org/apache/doris/nereids/memo/Memo.java
index f5616a71c7..3583db9f4e 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/memo/Memo.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/memo/Memo.java
@@ -375,26 +375,13 @@ public class Memo {
if (source.equals(destination)) {
return source;
}
- List<GroupExpression> needReplaceChild = Lists.newArrayList();
- for (GroupExpression groupExpression : groupExpressions.values()) {
- if (groupExpression.children().contains(source)) {
- if (groupExpression.getOwnerGroup().equals(destination)) {
- // cycle, we should not merge
- return null;
- }
- needReplaceChild.add(groupExpression);
- }
+ if (source.getParentGroupExpressions().stream()
+ .anyMatch(e -> e.getOwnerGroup().equals(destination))) {
+ return null;
}
- for (GroupExpression groupExpression : needReplaceChild) {
+ for (GroupExpression groupExpression :
source.getParentGroupExpressions()) {
groupExpressions.remove(groupExpression);
- List<Group> children = new ArrayList<>(groupExpression.children());
- // TODO: use a better way to replace child, avoid traversing all
groupExpression
- for (int i = 0; i < children.size(); i++) {
- if (children.get(i).equals(source)) {
- children.set(i, destination);
- }
- }
- groupExpression.setChildren(ImmutableList.copyOf(children));
+ groupExpression.replaceChild(source, destination);
GroupExpression that = groupExpressions.get(groupExpression);
if (that != null && that.getOwnerGroup() != null
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