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Re: Help with gram.y (UNDER)

From: Chris Bitmead <chris(at)bitmead(dot)com>
To: Postgres Hackers List <hackers(at)postgreSQL(dot)org>
Subject: Re: Help with gram.y (UNDER)
Date: 2000-05-24 13:49:11
Message-ID: 392BDDD7.B1838271@bitmead.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Chris Bitmead wrote:
> 
> It seems like bison is confused by having that '(' just after an
> optional syntax (UNION). 

I mean the optional UNDER

> If I place something after OptUnder (USING just

I mean USING;

i.e. CreateStmt:  CREATE OptTemp TABLE relation_name OptUnder USING  '('
OptTableElementList ')' OptInherit

This will accept "CREATE TABLE foo USING (aa text);"

but this...

CreateStmt:  CREATE OptTemp TABLE relation_name OptUnder '('
OptTableElementList ')' OptInherit

won't accept "CREATE TABLE foo (aa text);"

> to pick a token), then everything works fine (except of course the
> spurious USING becomes part of the syntax).
> 
> Does the '(' have some kind of second-class status as a token that would
> cause this wierdness?
> 
> Chris Bitmead wrote:
> >
> > Can someone give be a bit of help with gram.y to get this UNDER syntax
> > right? I did what I though was the obvious  syntax, but it no longer
> > accepts a plain create table after this change...
> >
> > OptUnder: UNDER relation_name_list      { $$ = $2; }
> >         | /*EMPTY*/       { $$ = NIL; }
> >         ;
> >
> > CreateStmt:  CREATE OptTemp TABLE relation_name OptUnder '('
> > OptTableElementList ')' OptInherit
> >                         {
> >                         /*etc */
> >                         }
> >                 ;
> >
> > The full patch is here...
> > ftp://ftp.tech.com.au/pub/diff.x

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