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Re: look up tables while parsing queries

From: andrew <andrew(dot)ylzhou(at)gmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: look up tables while parsing queries
Date: 2006-02-06 09:24:26
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On 2/5/06, Neil Conway <neilc(at)samurai(dot)com> wrote:
> If you're referring to the raw parser (parser/gram.y), you should not
> attempt to access any tables. For one thing, the raw parser might be
> invoked outside a transaction. The statement might also refer to a table
> created earlier in the same query string, which would mean the
> referenced table would not exist when the latter part of the query
> string is parsed.
> Instead, database access should be done in the analysis phase -- see
> transformStmt() in parser/analyze.c and friends. There are plenty of
> examples in the code of how to access tables, which should be a helpful
> guide.
> -Neil

It is not in the raw parser. I meant inside the transformStmt(). What
is "friends"? Could  you possibly point out at least one place that
illustrates how to access  tables?



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