| From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Vadim Mikheev <vadim(at)krs(dot)ru> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Patrick Giagnocavo <a222(at)redrose(dot)net>, pgsql-sql(at)postgreSQL(dot)org |
| Subject: | Re: [SQL] qurey plan and indices |
| Date: | 1999-08-06 02:33:32 |
| Message-ID: | 199908060233.WAA21522@candle.pha.pa.us |
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| Thread: | |
| Lists: | pgsql-sql |
> Not in all cases. First, to use InitPlan you would have to add
> DISTINCT to subquery to avoid duplicates. Second, there is another
> way of optimization - cache/hash subquery results to avoid
> re-execution of subquery plan. Planner should make decision what
> way to follow.
Yep, that's what I was looking for.
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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