morrySnow commented on code in PR #13827:
URL: https://github.com/apache/doris/pull/13827#discussion_r1010019843
##########
fe/fe-core/src/main/java/org/apache/doris/analysis/SelectStmt.java:
##########
@@ -1068,8 +1068,13 @@ private void analyzeAggregation(Analyzer analyzer)
throws AnalysisException {
substituteOrdinalsAliases(groupingExprs, "GROUP BY", analyzer);
- if (!groupByClause.isGroupByExtension()) {
+ if (!groupByClause.isGroupByExtension() &&
!groupingExprs.isEmpty()) {
+ ArrayList<Expr> tempExprs = new ArrayList<>(groupingExprs);
groupingExprs.removeIf(Expr::isConstant);
+ if (groupingExprs.isEmpty()) {
+ // should keep at least one expr to make the result correct
+ groupingExprs.add(tempExprs.get(0));
Review Comment:
why we need to keep one? i think
```
select sum(a) from t group by 2
```
is same with
```
select sum(a) from t
```
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