englefly commented on code in PR #11717:
URL: https://github.com/apache/doris/pull/11717#discussion_r944146690
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fe/fe-core/src/main/java/org/apache/doris/nereids/memo/Memo.java:
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@@ -169,7 +169,8 @@ private Pair<Boolean, GroupExpression>
rewriteGroupExpression(
GroupExpression groupExpression, Group target, LogicalProperties
logicalProperties) {
boolean newGroupExpressionGenerated = true;
GroupExpression existedGroupExpression =
groupExpressions.get(groupExpression);
- if (existedGroupExpression != null) {
+ if (existedGroupExpression != null
+ && (target == null ||
target.equals(existedGroupExpression.getOwnerGroup()))) {
Review Comment:
if target is not null, and not the owner group of existedGroupExpression,
should we merge them, as we do in insertGroupExpression()?
Otherwise, there are two groups with equivalent group expressions in Memo.
I think this issue is introduced by former pr, which split
insertGroupExpression() and rewriteGroupExpression() from
insertOrRewriteGroupExpression().
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