Horton

Re: Row pattern recognition

Henson Choi <assam258@gmail.com>

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From: Henson Choi <assam258@gmail.com>
To: Tatsuo Ishii <ishii@postgresql.org>
Cc: zsolt.parragi@percona.com, sjjang112233@gmail.com, vik@postgresfriends.org, er@xs4all.nl, jacob.champion@enterprisedb.com, david.g.johnston@gmail.com, peter@eisentraut.org, li.evan.chao@gmail.com, pgsql-hackers@postgresql.org
Date: 2026-05-02T04:30:25Z
Lists: pgsql-hackers 
Hi Tatsuo,

I know in v47 JIT compilation supports PREV/NEXT. What about
> FIRST/LAST and compound forms?
>

Yes, those are JIT-compiled too in v47.

The JIT side only deals with two opcodes -- EEOP_RPR_NAV_SET
and EEOP_RPR_NAV_RESTORE.

FIRST/LAST and the compound forms differ only in how
ExecEvalRPRNavSet() computes target_pos for the slot swap;
the opcode interface and the call into ExecEvalRPRNavSet /
ExecEvalRPRNavRestore are unchanged.

So 0018's JIT support carries over to FIRST/LAST and
compounds without any JIT-side change.

Regards,
Henson