Re: Row pattern recognition

Hi Henson,

>> Here do you have "ONE ROW PER MATCH" option of RPR in your mind? In my
>> understanding it's in MATCH_RECOGNIZE clause, but not in RPR in Window
>> clause. (ALL ROWS PER MATCH is not applicable either in RPR in
>> Window clause).
>>
>>
> You're absolutely right - thank you for the correction!
> 
> I'm currently exploring what this NFA structure could theoretically
> support, rather than strictly binding to the spec yet. Since I'm
> still learning from Oracle manuals and your code without access to
> the full SQL:2016 standard, I mixed up MATCH_RECOGNIZE syntax with
> Window clause RPR - sorry for the confusion!

No problem at all. MATCH_RECOGNIZE and Window clause RPR are quite
similar. In the mean time "Trino" manual maybe useful for you if you
don't have access to the SQL standard.
https://trino.io/docs/current/sql/pattern-recognition-in-window.html

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