RE: Should consider materializing the cheapest inner path in consider_parallel_nestloop()

Hi. Tender.

Thank you for modification.

> From: Tender Wang <tndrwang@gmail.com>
> Sent: Tuesday, June 4, 2024 7:51 PM
>     Please add more tests.  Especially please add some negative tests;
>     current patch checks that it is safe to apply materialization. It would
>     be helpful to add tests checking that materialization is not applied
>     in both checked cases:
>     1. when inner join path is not parallel safe
>     2. when matpath is not parallel safe
> 
> 
> 
> I added a test case that inner rel is not parallel safe. Actually, 
> matpath will not create if inner rel is not parallel safe. So I didn't add test case for the second  scenario.
Is there case in which matpath is not parallel safe and inner rel is parallel safe?
If right, I think that it would be suitable to add a negative test in a such case.

Sincerely yours,
Yuuki Fujii

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Yuuki Fujii
Information Technology R&D Center Mitsubishi Electric Corporation