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Re: [HACKERS] Little parser question

From: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>
To: jwieck(at)debis(dot)com
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: [HACKERS] Little parser question
Date: 1998-10-01 22:51:49
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
> Hi,
>     while  fixing  the  subselect  parseback  in the new ruleutil
>     functions and checking if the output is now what's needed for
>     dumping  rules/views  I  came  across  a little detail in the
>     parser I'm confused about.
>     Having a table
>     CREATE TABLE t1 (a char(20));
>     the two statements
>     INSERT INTO t1 VALUES ('x');
>     INSERT INTO t1 VALUES ('x'::bpchar);
>     produce mainly the same parsetree (where the const value  'x'
>     of  type 1042 is embedded into a call to bpchar(bpchar, int4)
>     for the padding).
>     But in the first case argument 1 is constbyval  TRUE  and  in
>     the  second  one  FALSE (where I feel the second one is right
>     for a bpchar const). Seems that it doesn't matter later.

I have just committed a fix for this.  The parse_coerce code was not
setting the constbyval dependent on the type.  There were a few other
places where this was not set properly, and those are fixed now.

  Bruce Momjian                        |
  maillist(at)candle(dot)pha(dot)pa(dot)us            |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

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