| From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | hackers(at)postgreSQL(dot)org (PostgreSQL-development) |
| Cc: | vadim(at)sable(dot)krasnoyarsk(dot)su (Vadim B(dot) Mikheev) |
| Subject: | subselects |
| Date: | 1998-01-21 04:21:22 |
| Message-ID: | 199801210421.XAA03150@candle.pha.pa.us |
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| Thread: | |
| Lists: | pgsql-hackers |
OK, I now have rewrites working with subselects. At least, I think it
will work. No way to test it yet.
It basically rewrites all the subqueries first, then the main query. It
does the lowest queries first. I do this so if a rewrite adds a
subquery as part of the rewrite, the new subquery does not get
processed.
For each query rewritten, I have code to go into each SubLink and recode
any correlated variables that reference the outer query level I am
rewriting. Pretty slick.
--
Bruce Momjian
maillist(at)candle(dot)pha(dot)pa(dot)us
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