Thread: Trivial revise for the check of parameterized partial paths

On Thu, 29 Jun 2023 at 08:53, Richard Guo <guofenglinux@gmail.com> wrote:
>
> While working on the invalid parameterized join path issue [1], I
> noticed that we can simplify the codes for checking parameterized
> partial paths in try_partial_hashjoin/mergejoin_path, with the help of
> macro PATH_REQ_OUTER.
>
> -       if (inner_path->param_info != NULL)
> -       {
> -               Relids          inner_paramrels = inner_path->param_info->ppi_req_outer;
> -
> -               if (!bms_is_empty(inner_paramrels))
> -                       return;
> -       }
> +       if (!bms_is_empty(PATH_REQ_OUTER(inner_path)))
> +               return;
>
> Also there is a comment there that is not correct.
>
>  * If the inner path is parameterized, the parameterization must be fully
>  * satisfied by the proposed outer path.
>
> This is true for nestloop but not for hashjoin/mergejoin.
>
> Besides, I wonder if it'd be better that we verify that the outer input
> path for a partial join path should not have any parameterization
> dependency.
>
> Attached is a patch for all these changes.

I'm seeing that there has been no activity in this thread for nearly 7
months, I'm planning to close this in the current commitfest unless
someone is planning to take it forward.

Regards,
Vignesh

On Thu, Jan 25, 2024 at 3:21 PM Richard Guo <guofenglinux@gmail.com> wrote:
> On Sun, Jan 21, 2024 at 8:36 PM vignesh C <vignesh21@gmail.com> wrote:
>> I'm seeing that there has been no activity in this thread for nearly 7
>> months, I'm planning to close this in the current commitfest unless
>> someone is planning to take it forward.
>
>
> This patch fixes the wrong comments in try_partial_hashjoin_path, and
> also simplifies and enhances the checks for parameterized partial paths.
> I think it's worth to be moved forward.
>
> I've rebased the patch over current master, added a commit message
> describing what it does, and updated the comment a little bit in the v2
> patch.

I've pushed this patch.

Thanks
Richard