924060929 commented on code in PR #11043:
URL: https://github.com/apache/doris/pull/11043#discussion_r926376161
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/memo/Memo.java:
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@@ -188,19 +189,24 @@ private void mergeGroup(Group source, Group destination) {
children.set(i, destination);
}
}
- if (groupExpressions.containsKey(groupExpression)) {
- // TODO: need to merge group recursively
-
groupExpression.getOwnerGroup().removeGroupExpression(groupExpression);
+ GroupExpression that = groupExpressions.get(groupExpression);
+ if (that != null) {
+ mergeGroup(groupExpression.getOwnerGroup(),
that.getOwnerGroup());
} else {
groupExpressions.put(groupExpression, groupExpression);
}
}
- for (GroupExpression groupExpression : source.getLogicalExpressions())
{
- source.removeGroupExpression(groupExpression);
+
+ Iterator<GroupExpression> iterator =
source.getLogicalExpressions().iterator();
+ while (iterator.hasNext()) {
+ GroupExpression groupExpression = iterator.next();
+ iterator.remove();
destination.addGroupExpression(groupExpression);
}
- for (GroupExpression groupExpression :
source.getPhysicalExpressions()) {
- source.removeGroupExpression(groupExpression);
+ iterator = source.getPhysicalExpressions().iterator();
Review Comment:
```suggestion
if (source != destination) {
// copy sourceGroup's physicalExpressions to destination group
destination.addPhysicalExpressions(source.getPhysicalExpressions());
source.clearPhysicalExpressions();
}
```
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