Horton

Re: Properly pathify the union planner

David Rowley <dgrowleyml@gmail.com>

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From: David Rowley <dgrowleyml@gmail.com>
To: Richard Guo <guofenglinux@gmail.com>
Cc: PostgreSQL Developers <pgsql-hackers@lists.postgresql.org>
Date: 2024-03-08T03:30:55Z
Lists: pgsql-hackers 
On Fri, 8 Mar 2024 at 00:39, Richard Guo <guofenglinux@gmail.com> wrote:
> I would like to have another look, but it might take several days.
> Would that be too late?

Please look. Several days is fine. I'd like to start looking on Monday
or Tuesday next week.

Thanks

David

Commits

  1. Don't adjust ressortgroupref in generate_setop_child_grouplist()

  2. Don't zero tuple_fraction when planning UNIONs with ORDER BYs

  3. Fix assert failure when planning setop subqueries with CTEs

  4. Allow planner to use Merge Append to efficiently implement UNION

  5. Simplify PathKey checking code

  6. Clarify the 'rows' parameter in create_append_path