Thread

Re: Row pattern recognition

Tatsuo Ishii <ishii@postgresql.org> — 2026-05-02T04:38:28Z

Hi Henson,

> 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.

Ok, from user's point of view, PREV/NEXT/FIRST/LAST and compound forms
are all JIT-compiled. I will add it to the "major changes" section in
the v47 patches posting.

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