From: Alvaro Herrera <alvherre@commandprompt.com>
To: Joe Conway <mail@joeconway.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-patches@postgreSQL.org
Subject: Re: Values list-of-targetlists patch for comments (was Re:
Date: Wed, 2 Aug 2006 14:59:52 -0400
Message-ID: <20060802185952.GD6019@alvh.no-ip.org> (raw)
In-Reply-To: <44D0EA83.7050702@joeconway.com>
References: <50461.84.63.113.55.1152832991.squirrel@pezone.net>
<ECCAAC0A3182895D3D12B0E8@[172.26.14.247]>
<44B7ADFC.90205@dunslane.net>
<44D03D9F.80203@joeconway.com>
<15263.1154526181@sss.pgh.pa.us>
<44D0AF87.2030304@joeconway.com>
<16892.1154528708@sss.pgh.pa.us>
<44D0B9C1.2020608@joeconway.com>
<17704.1154534183@sss.pgh.pa.us>
<44D0EA83.7050702@joeconway.com>
Joe Conway wrote:
> What if we built an array of A_Const nodes instead of a List? Maybe we
> could use something akin to appendStringInfo()/enlargeStringInfo() to
> build the array of nodes and enlarge it in chunks.
In inval.c you find this:
/*
* To minimize palloc traffic, we keep pending requests in successively-
* larger chunks (a slightly more sophisticated version of an expansible
* array). All request types can be stored as SharedInvalidationMessage
* records. The ordering of requests within a list is never significant.
*/
typedef struct InvalidationChunk
{
struct InvalidationChunk *next; /* list link */
int nitems; /* # items currently stored in chunk */
int maxitems; /* size of allocated array in this chunk */
SharedInvalidationMessage msgs[1]; /* VARIABLE LENGTH ARRAY */
} InvalidationChunk; /* VARIABLE LENGTH STRUCTURE */
Which might give you an idea ...
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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Cc: alvherre@commandprompt.com, mail@joeconway.com, tgl@sss.pgh.pa.us, pgsql-patches@postgreSQL.org
Subject: Re: Values list-of-targetlists patch for comments (was Re:
In-Reply-To: <20060802185952.GD6019@alvh.no-ip.org>
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