alamb commented on issue #1049:
URL:
https://github.com/apache/arrow-datafusion/issues/1049#issuecomment-933352649
For the record, here is what postgres does (accepts this query)
```
alamb=# create table simple(c1 int, c2 int, c3 int);
CREATE TABLE
alamb=# explain select * from public.simple as a join (select * from
public.simple) as b on a.c3=b.c3;
QUERY PLAN
-------------------------------------------------------------------------
Merge Join (cost=285.08..607.40 rows=20808 width=24)
Merge Cond: (a.c3 = simple.c3)
-> Sort (cost=142.54..147.64 rows=2040 width=12)
Sort Key: a.c3
-> Seq Scan on simple a (cost=0.00..30.40 rows=2040 width=12)
-> Sort (cost=142.54..147.64 rows=2040 width=12)
Sort Key: simple.c3
-> Seq Scan on simple (cost=0.00..30.40 rows=2040 width=12)
(8 rows)
alamb=# select * from public.simple as a join (select * from public.simple)
as b on a.c3=b.c3;
c1 | c2 | c3 | c1 | c2 | c3
----+----+----+----+----+----
(0 rows)
alamb=#
```
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