jackwener commented on code in PR #20051:
URL: https://github.com/apache/doris/pull/20051#discussion_r1205111186
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/memo/Memo.java:
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@@ -111,7 +111,8 @@ public Map<GroupExpression, GroupExpression>
getGroupExpressions() {
}
private Plan skipProject(Plan plan, Group targetGroup) {
- if (plan instanceof LogicalProject) {
+ // Some top project can't be eliminated
+ if (plan instanceof LogicalProject && ((LogicalProject<?>)
plan).canEliminate()) {
Review Comment:
Can't skip project whose canEliminate() is true
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