Jan,

Whilst you are working on the rules system it would be nice if
you could look for an oportunity to store the plain text rule
definition at creation time.

If the definition were stored in a table column it would allow us
to dump and restore databases in a more complete way.

I looked at this some while ago myself but never got close to 
making it work.

	Keith.
	 
jwieck@debis.com (Jan Wieck)
> 
> Hi,
> 
>     got  a  lot  of  things working up to now. Most things on the
>     relation level are fixed  now,  including  qualified  instead
>     rules.  Update  rules  can  now  correctly refer to *new* and
>     *current*.
> 
>     Must check if instead nothing with/without  qualification  is
>     O.K.  and  if  the  regression tests are still happy with the
>     changes.
> 
>     What I haven't touched yet are rules on the  attribute  level
>     and  the  update  new stuff. If regression tests walk through
>     and the instead nothing is O.K. I'll send a first patch  with
>     some test queries on monday.  Next todo is then update new.
> 
>     Have a nice wieckend :-)
> 
> 
> Jan
> 
> --
> 
> #======================================================================#
> # It's easier to get forgiveness for being wrong than for being right. #
> # Let's break this rule - forgive me.                                  #
> #======================================== jwieck@debis.com (Jan Wieck) #
> 
> 
> 


Sun, 16 Aug 1998 21:21:07 +0100 (BST)
Keith Parks <emkxp01@mtcc.demon.co.uk>
Re: [HACKERS] Rules: first fix on monday
>
> Jan,
>
> Whilst you are working on the rules system it would be nice if
> you could look for an oportunity to store the plain text rule
> definition at creation time.
>
> If the definition were stored in a table column it would allow us
> to dump and restore databases in a more complete way.
>
> I looked at this some while ago myself but never got close to
> making it work.
>
>    Keith.
>

    Yes,  that  would really be nice and I had something the like
    already in mind.

    I'm not really sure if it's a good thing to  save  the  rules
    definition  text  instead of the parsetree. The advantages of
    doing so would be that the rule could easily  be  dumped  and
    (more  important)  that  the  rules can have more complicated
    actions (remember that the currently  stored  parsetrees  can
    quickly override the size limit of a text type).

    Storing  the  definition  text only would require to parse at
    least the actions any time, a  rule  should  be  fired  on  a
    query.  Bad  for  performance - but must check if significant
    bad.

    At least I can't do this for 6.4 I think. But I'm willing  to
    take a look at it after.

    On   the  other  hand  wouldn't  it  be  too  complicated  to
    reconstruct  a  command  from  the  parsetree,  that  exactly
    creates  the  rule.  Reading a parsetree isn't fun, but after
    all I did on the rewrite system I'm somewhat familiar with it
    now  (sometimes  I  see  the  cup in a targetlist, the coffee
    machine  in  the  rangetable  and  all  the  buttons  in  the
    qualification  when  pulling  a  coffee  out  of it - think I
    should I consult a psychist when the  rule  system  is  fixed
    :-).


Jan

--

#======================================================================#
# It's easier to get forgiveness for being wrong than for being right. #
# Let's break this rule - forgive me.                                  #
#======================================== jwieck@debis.com (Jan Wieck) #



Mon, 17 Aug 1998 12:22:12 +0200 (MET DST)
jwieck@debis.com (Jan Wieck)
Re: [HACKERS] Rules: first fix on monday
> > Whilst you are working on the rules system it would be nice if
> > you could look for an oportunity to store the plain text rule
> > definition at creation time.
> > If the definition were stored in a table column it would allow us
> > to dump and restore databases in a more complete way.
>     Yes,  that  would really be nice and I had something the like
>     already in mind.
>     I'm not really sure if it's a good thing to  save  the  rules
>     definition  text  instead of the parsetree. The advantages of
>     doing so would be that the rule could easily  be  dumped  and
>     (more  important)  that  the  rules can have more complicated
>     actions (remember that the currently  stored  parsetrees  can
>     quickly override the size limit of a text type).
> 
>     Storing  the  definition  text only would require to parse at
>     least the actions any time, a  rule  should  be  fired  on  a
>     query.  Bad  for  performance - but must check if significant
>     bad.

How about storing both an internal form and the plain text source? That
way you can use the fast form internally and dump the plain text...

                      - Tom

Mon, 17 Aug 1998 15:33:12 +0000
"Thomas G. Lockhart" <lockhart@alumni.caltech.edu>
Re: [HACKERS] Rules: first fix on monday
I wrote:
>
> >
> > Jan,
> >
> > Whilst you are working on the rules system it would be nice if
> > you could look for an oportunity to store the plain text rule
> > definition at creation time.
> >
> > If the definition were stored in a table column it would allow us
> > to dump and restore databases in a more complete way.
> >
> > I looked at this some while ago myself but never got close to
> > making it work.
> >
> >    Keith.
> >
>
>     Yes,  that  would really be nice and I had something the like
>     already in mind.
>
> [...]
>     On   the  other  hand  wouldn't  it  be  too  complicated  to
>     reconstruct  a  command  from  the  parsetree,  that  exactly
>     creates  the  rule.  Reading a parsetree isn't fun, but after
>     all I did on the rewrite system I'm somewhat familiar with it
>     now  (sometimes  I  see  the  cup in a targetlist, the coffee
>     machine  in  the  rangetable  and  all  the  buttons  in  the
>     qualification  when  pulling  a  coffee  out  of it - think I
>     should I consult a psychist when the  rule  system  is  fixed
>     :-).
>
>
> Jan

    To  demonstrate  that  it really isn't that complicated as it
    looks, here is a C function that if defined in the backend as

        CREATE FUNCTION get_ruledef(name)
                RETURNS text AS '.../get_ruledef.so'
                LANGUAGE 'C';

    can be used to see a textual representation of the rule given
    as argument.

    It is able to handle ALL the rules  I  defined  in  the  test
    suite for my first fix (sent yesterday). In addition I tested
    a

        ... WHERE (att, att) IN (SELECT ...)

    in the definition of a  view.  Worked  too.  The  output  can
    easily  be fed back into a psql and produces exactly the same
    pg_rewrite entries that where there before.

    It is not complete (aggregates are not handled up to now  and
    there  might  be some other expression constructs, that could
    occur). But it's a starting point I think. At least we  could
    produce a view

        CREATE VIEW pg_rule AS
            SELECT rulename, get_ruledef(rulename) AS definition
            FROM pg_rewrite;

    Now pg_dump could output views as commands for regular tables
    and add commands for  the  rules.   It  must  omit  the  rule
    _retpg_user in the dump, but that's all.  All views and rules
    are restored.

    pg_dump should not select all rules at once, because if  only
    one  of the rules cannot be converted back to it's definition
    string, none could be dumped. Instead it should get a list of
    all  the  rule  names in pg_rewrite (without _retpg_user) and
    then loop over it getting one at a time.

    As soon as anybody reports an error (pg_dump cannot save rule
    ...)   we  know  what case isn't handled by get_ruledef() and
    could implement it.


Jan

--

#======================================================================#
# It's easier to get forgiveness for being wrong than for being right. #
# Let's break this rule - forgive me.                                  #
#======================================== jwieck@debis.com (Jan Wieck) #


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$`*``````
`
end

Tue, 18 Aug 1998 19:43:32 +0200 (MET DST)
jwieck@debis.com (Jan Wieck)
Re: [HACKERS] dumping rules
BTW: get_ruledef() would be useful for psql's \d too.


Jan

-- 

#======================================================================#
# It's easier to get forgiveness for being wrong than for being right. #
# Let's break this rule - forgive me.                                  #
#======================================== jwieck@debis.com (Jan Wieck) #


Tue, 18 Aug 1998 19:47:48 +0200 (MET DST)
jwieck@debis.com (Jan Wieck)
Re: [HACKERS] dumping rules
I have fixed the parser to all update/insert queries will have a
resdomno equal to the attribute number of the base relation.

At least, I hope so.  Can you remove the rewrite renumbering code and
let me know.  Thanks.

-- 
Bruce Momjian                          |  830 Blythe Avenue
maillist@candle.pha.pa.us              |  Drexel Hill, Pennsylvania 19026
  +  If your life is a hard drive,     |  (610) 353-9879(w)
  +  Christ can be your backup.        |  (610) 853-3000(h)

Mon, 24 Aug 1998 23:15:38 -0400 (EDT)
Bruce Momjian <maillist@candle.pha.pa.us>
rewrite system and Resdom