Re: Row pattern recognition

> Great. I will look into this.

I am impressed the simple NFA implementation. It would be nicer if it
could be implemented without using recursion.

> By the way, I tested my patch (v10) to handle more large data set and
> tried to following query with pgbench database. On my laptop it works
> with 100k rows pgbench_accounts table but with beyond the number I got
~~~ I meant 10k.

> OOM killer. I would like to enhance this in the next patch.
>
> SELECT aid, first_value(aid) OVER w,
> count(*) OVER w
> FROM pgbench_accounts
> WINDOW w AS (
> PARTITION BY bid
> ORDER BY aid
> ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
> AFTER MATCH SKIP PAST LAST ROW
> INITIAL
> PATTERN (START UP+)
> DEFINE
> START AS TRUE,
> UP AS aid > PREV(aid)
> );

I ran this against your patch. It failed around > 60k rows.

Best reagards,
--
Tatsuo Ishii
SRA OSS LLC
English: http://www.sraoss.co.jp/index_en/
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