From: | "Vadim B(dot) Mikheev" <vadim(at)sable(dot)krasnoyarsk(dot)su> |
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To: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
Cc: | PostgreSQL-development <hackers(at)postgreSQL(dot)org> |
Subject: | Re: subselects |
Date: | 1998-01-19 06:37:41 |
Message-ID: | 34C2F4B4.7BBA1DB2@sable.krasnoyarsk.su |
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Lists: | pgsql-hackers |
Bruce Momjian wrote:
>
> OK, I have added code to allow the SubLinks make it to the optimizer.
>
> I implemented ParseState->parentParseState, but not parentQuery, because
> the parentParseState is much more valuable to me, and Vadim thought it
> might be useful, but was not positive. Also, keeping that parentQuery
> pointer valid through rewrite may be difficult, so I dropped it.
> ParseState is only valid in the parser.
>
> I have not done:
>
> correlated subquery column references
> added Var->sublevels_up
> gotten this to work in the rewrite system
> have not added full CopyNode support
>
> I will address these in the next few days.
Nice! I'm starting with non-correlated subqueries...
Vadim
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