| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Inheritance planner CPU and memory usage change since 9.3.2 |
| Date: | 2015-06-21 16:29:19 |
| Message-ID: | 593.1434904159@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> writes:
> However, there's an obvious improvement that can be made to Tom's
> patch -- having computed modifiableARIindexes, you may as well use it
> in the innermost loop to only apply ChangeVarNodes() to those
> AppendRelInfo's that can actually change, rather than having it trawl
> through all the other ones that we know won't be touched.
Right. Also, as Robert noted, we can short-circuit a few more things when
there are no subquery RTEs. I'll combine these ideas and push something,
but probably not till tomorrow.
regards, tom lane
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