Kikyou1997 commented on code in PR #15322:
URL: https://github.com/apache/doris/pull/15322#discussion_r1057095560
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fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/logical/EliminateGroupByConstant.java:
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@@ -50,12 +50,18 @@ public Rule build() {
List<Expression> groupByExprs = aggregate.getGroupByExpressions();
List<NamedExpression> outputExprs =
aggregate.getOutputExpressions();
Set<Expression> slotGroupByExprs = Sets.newLinkedHashSet();
+ Expression lit = null;
for (Expression expression : groupByExprs) {
expression = FoldConstantRule.INSTANCE.rewrite(expression);
if (!(expression instanceof Literal)) {
slotGroupByExprs.add(expression);
+ } else {
+ lit = expression;
}
}
+ if (slotGroupByExprs.isEmpty() && lit != null) {
+ slotGroupByExprs.add(lit);
+ }
Review Comment:
和旧优化器保持一致，否则BE处理上会出问题
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