Re: Pathify RHS unique-ification for semijoin planning

Richard Guo <guofenglinux@gmail.com>

From: Richard Guo <guofenglinux@gmail.com>

To: PostgreSQL-development <pgsql-hackers@postgresql.org>

Date: 2025-07-03T10:06:47Z

Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Simplify relation_has_unique_index_for()
- bf9ee294e567 19 (unreleased) landed
Pathify RHS unique-ification for semijoin planning
- 24225ad9aafc 19 (unreleased) landed
Convert varatt.h access macros to static inline functions.
- e035863c9a04 19 (unreleased) cited
Re-export a few of createplan.c's make_xxx() functions.
- 570be1f73f38 9.6.0 cited

Attachments

v4-0001-Pathify-RHS-unique-ification-for-semijoin-plannin.patch (application/octet-stream) patch v4-0001

On Tue, Jul 1, 2025 at 11:57 AM Richard Guo <guofenglinux@gmail.com> wrote:
> On Tue, Jun 3, 2025 at 4:52 PM Richard Guo <guofenglinux@gmail.com> wrote:
> > Here is an updated version of the patch, which is ready for review.
> > I've fixed a cost estimation issue, improved some comments, and added
> > a commit message.  Nothing essential has changed.

> This patch does not apply anymore, and here is a new rebase.

This patch does not apply again, so here is a new rebase.

This version also fixes an issue related to parameterized paths: if
the RHS has LATERAL references to the LHS, unique-ification becomes
meaningless because the RHS depends on the LHS, and such paths should
not be generated.

Thanks
Richard