avamingli opened a new issue, #1376:
URL: https://github.com/apache/cloudberry/issues/1376
### Apache Cloudberry version
main
### What happened
as titile
### What you think should happen instead
_No response_
### How to reproduce
```sql
create table t1(a int, b int);
create table t2 like(t1);
set gp_cte_sharing = on;
explain(locus, costs off) with x as (select a, count(*) as b from t1 group
by a union all select a, count(*) as b from t2 group by a) select count(*) from
x a join x b on a.a = b.b;
QUERY PLAN
------------------------------------------------------------------------
Finalize Aggregate
Locus: Entry
-> Gather Motion 3:1 (slice1; segments: 3)
Locus: Entry
-> Partial Aggregate
Locus: Hashed
-> Hash Join
Locus: Hashed
Hash Cond: (b.b = a.a)
-> Redistribute Motion 3:3 (slice2; segments: 3)
Locus: Hashed
Hash Key: b.b
-> Subquery Scan on b
Locus: Strewn
-> Shared Scan (share slice:id 2:0)
Locus: NULL
-> Hash
Locus: Hashed
-> Subquery Scan on a
Locus: Hashed
-> Shared Scan (share slice:id 1:0)
Locus: NULL
-> Append
Locus: Hashed
-> HashAggregate
Locus: Hashed
Group Key: t1.a
-> Seq Scan on t1
Locus: Hashed
-> HashAggregate
Locus: Hashed
Group Key: t2.a
-> Seq Scan on t2
Locus: Hashed
Optimizer: Postgres query optimizer
(35 rows)
```
### Operating System
all
### Anything else
_No response_
### Are you willing to submit PR?
- [x] Yes, I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/cloudberry/blob/main/CODE_OF_CONDUCT.md).
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