924060929 commented on code in PR #11027:
URL: https://github.com/apache/doris/pull/11027#discussion_r925151810
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/memo/Memo.java:
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@@ -180,8 +180,8 @@ private void mergeGroup(Group source, Group destination) {
}
}
if (groupExpressions.containsKey(groupExpression)) {
- // TODO: need to merge group recursively
-
groupExpression.getParent().removeGroupExpression(groupExpression);
+ GroupExpression that = groupExpressions.get(groupExpression);
+ mergeGroup(groupExpression.getOwnerGroup(),
that.getOwnerGroup());
Review Comment:
we should add some ut for merge group recursively
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