my-ship-it opened a new issue, #1130:
URL: https://github.com/apache/cloudberry/issues/1130
### Apache Cloudberry version
main
### What happened
```
create table t1(v1 int, v2 int, v3 int);
insert into t1 values(generate_series(1, 10), generate_series(11, 20),
generate_series(21, 30));
analyze t1;
create table t2(v1 int, v2 int, v3 int);
insert into t2 values(generate_series(0, 100), generate_series(100, 200),
generate_series(200, 300));
postgres=# explain verbose select c11.v1 from (select v1, v2, random() v3
from t1) as c11 left join (select v1, v2, v3 from t1) as c22 on c11.v1=c22.v1
where c11.v1 < 5
;
QUERY PLAN
----------------------------------------------------------------------------------
Gather Motion 3:1 (slice1; segments: 3) (cost=0.00..862.00 rows=5 width=4)
Output: t1.v1
-> Hash Left Join (cost=0.00..862.00 rows=2 width=4)
Output: t1.v1
Hash Cond: (t1.v1 = t1_1.v1)
-> Seq Scan on public.t1 (cost=0.00..431.00 rows=2 width=4)
Output: t1.v1
Filter: (t1.v1 < 5)
-> Hash (cost=431.00..431.00 rows=2 width=4)
Output: t1_1.v1
-> Seq Scan on public.t1 t1_1 (cost=0.00..431.00 rows=2
width=4)
Output: t1_1.v1
Filter: (t1_1.v1 < 5)
Settings: optimizer = 'on'
Optimizer: GPORCA
(15 rows)
```
### What you think should happen instead
The plan produced by planner of PG which is correct:
```
postgres=# explain verbose select c11.v1 from (select v1, v2, random() v3
from t1) as c11 left join (select v1, v2, v3 from t1) as c22 on c11.v1=c22.v1
where c11.v1 < 5
;
QUERY PLAN
---------------------------------------------------------------------------------------
Gather Motion 3:1 (slice1; segments: 3) (cost=1.07..2.17 rows=3 width=4)
Output: c11.v1
-> Hash Right Join (cost=1.07..2.12 rows=1 width=4)
Output: c11.v1
Hash Cond: (t1.v1 = c11.v1)
-> Seq Scan on public.t1 (cost=0.00..1.03 rows=3 width=4)
Output: t1.v1, t1.v2, t1.v3
-> Hash (cost=1.06..1.06 rows=1 width=4)
Output: c11.v1
-> Subquery Scan on c11 (cost=0.00..1.06 rows=1 width=4)
Output: c11.v1
-> Seq Scan on public.t1 t1_1 (cost=0.00..1.04 rows=1
width=16)
Output: t1_1.v1, NULL::integer, random()
Filter: (t1_1.v1 < 5)
Settings: optimizer = 'off'
Optimizer: Postgres query optimizer
(16 rows)
```
### How to reproduce
As above
### Operating System
CentOs
### Anything else
_No response_
### Are you willing to submit PR?
- [ ] 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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