Re: Row pattern recognition

From: Tatsuo Ishii <ishii(at)postgresql(dot)org>
To: assam258(at)gmail(dot)com
Cc: zsolt(dot)parragi(at)percona(dot)com, sjjang112233(at)gmail(dot)com, vik(at)postgresfriends(dot)org, er(at)xs4all(dot)nl, jacob(dot)champion(at)enterprisedb(dot)com, david(dot)g(dot)johnston(at)gmail(dot)com, peter(at)eisentraut(dot)org, li(dot)evan(dot)chao(at)gmail(dot)com, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Row pattern recognition
Date: 2026-05-12 06:03:28
Message-ID: 20260512.150328.1502361632049642572.ishii@postgresql.org
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Hi Henson,

> Attached is the v47 patches for Row pattern recognition (SQL/RPR).

> - Add src/backend/executor/README.rpr (previously was in ExecRPR.c)

README.rpr is extremely useful for those who want to review the RPR
patches. I found a room to enhance the document. Attached is a small
patch tries to enhance README.rpr, on top of v47.

- Make "target audience" and "scope" of the README more descriptive.
- Add References (currently the SQL standards only)
- Add explanation of some abbreviations (NFA, AST)
- Add reference sections for absorption. Readers might not be familiar with "absorption"
- Add more fields to WindowAggState
- Add window framing rules with RPR

Regards,
--
Tatsuo Ishii
SRA OSS K.K.
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp

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