xinyiZzz opened a new issue #6265:
URL: https://github.com/apache/incubator-doris/issues/6265
**Describe the bug**
Execute the following sql:
```
create table test(col1 int, col2 int) distributed by hash(col1);
insert into test values(1, 2);
SELECT IF(GROUPING(`col1`) = 1, COUNT(col1), 0) AS class_count FROM test
GROUP BY GROUPING SETS((col1, col2), (col1)) order by 1;
```
Report an error:
```
ERROR 1064 (HY000): errCode = 2, detailMessage = Unexpected exception: null
```
In fe.log:
```
java.lang.NullPointerException: null
at
org.apache.doris.analysis.GroupingInfo.substituteGroupingFn(GroupingInfo.java:186)
~[palo-fe.jar:3.4.0]
at
org.apache.doris.analysis.GroupingInfo.substituteGroupingFn(GroupingInfo.java:204)
~[palo-fe.jar:3.4.0]
at
org.apache.doris.analysis.GroupingInfo.substituteGroupingFn(GroupingInfo.java:204)
~[palo-fe.jar:3.4.0]
at
org.apache.doris.analysis.GroupingInfo.substituteGroupingFn(GroupingInfo.java:175)
~[palo-fe.jar:3.4.0]
at org.apache.doris.analysis.SelectStmt.analyze(SelectStmt.java:511)
~[palo-fe.jar:3.4.0]
at
org.apache.doris.qe.StmtExecutor.analyzeAndGenerateQueryPlan(StmtExecutor.java:545)
~[palo-fe.jar:3.4.0]
at org.apache.doris.qe.StmtExecutor.analyze(StmtExecutor.java:480)
~[palo-fe.jar:3.4.0]
at org.apache.doris.qe.StmtExecutor.execute(StmtExecutor.java:271)
~[palo-fe.jar:3.4.0]
at org.apache.doris.qe.StmtExecutor.execute(StmtExecutor.java:249)
~[palo-fe.jar:3.4.0]
at
org.apache.doris.qe.ConnectProcessor.handleQuery(ConnectProcessor.java:206)
~[palo-fe.jar:3.4.0]
```
**Additional context**
Add any other context about the problem here.
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