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Re: rewriter in updateable views

From: Jaime Casanova <systemguards(at)gmail(dot)com>
To: Simon Riggs <simon(at)2ndquadrant(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: rewriter in updateable views
Date: 2005-03-28 04:12:27
Message-ID: c2d9e70e05032720126f743616@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Sat, 19 Mar 2005 11:42:18 +0000, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> I can see that I might want the view to have a different default value
> from that of the underlying table. I can see a reason to have multiple
> updateable views on the same table, all with different columns, column
> defaults and row selection clauses. (Multiple classes all held within
> the same physical table, for example).
> 
> I'd suggest - if the default value for a column on a view IS NOT set,
> then use the default value from the underlying table. If it IS set, then
> it should stay set, even if the underlying table changes. That might
> need some dependency logic in there...
> 
> Best Regards, Simon Riggs
> 
I think i can do this within rewriterHandle.c:build_column_default
immediatly after the first try i can ask if expr == NULL and if is it
a view if  so my code start looking for defaults on base tables maybe
using something like the parse_relation.c:colNameToVar function to
identify the column. there is a better way to do it? also the
ParseState parameter is extensively used in the colNameToVar function
but i can't find what is it.

regards,
Jaime Casanova

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