rewrite system.  Restructure parse_target to make it easier to
understand.

[AC_MSG_RESULT(yes) AC_DEFINE(HAVE_LONG_INT_64)],

this line produces something like:

  echo "$ac_t""yes" 1>&6 cat >> confdefs.h <<\EOF

and would append garbage "yes cat" to confdefs.h. Of course the
result confdefs.h is not syntactically correct therefore following
tests using confdefs.h would all fail.  To avoid the problem, we
could switch the order of AC_MSG_RESULT and AC_DEFINE (see attached
patch). This happend on my LinuxPPC box.


Tatsuo Ishii t-ishii@sra.co.jp

    patch is applied:

	Rewrite rules on relation level work fine now.

	Event qualifications on insert/update/delete  rules  work
	fine now.

	I  added  the  new  keyword  OLD to reference the CURRENT
	tuple. CURRENT will be removed in 6.5.

	Update rules can  reference  NEW  and  OLD  in  the  rule
	qualification and the actions.

	Insert/update/delete rules on views can be established to
	let them behave like real tables.

	For  insert/update/delete  rules  multiple  actions   are
	supported  now.   The  actions  can also be surrounded by
	parantheses to make psql  happy.   Multiple  actions  are
	required if update to a view requires updates to multiple
	tables.

	Regular users  are  permitted  to  create/drop  rules  on
	tables     they     have     RULE     permissions     for
	(DefineQueryRewrite() is  now  able  to  get  around  the
	access  restrictions  on  pg_rewrite).  This enables view
	creation for regular users too. This  required  an  extra
	boolean  parameter  to  pg_parse_and_plan() that tells to
	set skipAcl on all rangetable entries  of  the  resulting
	queries.       There      is      a      new     function
	pg_exec_query_acl_override()  that  could  be   used   by
	backend utilities to use this facility.

	All rule actions (not only views) inherit the permissions
	of the event relations  owner.  Sample:  User  A  creates
	tables    T1    and    T2,   creates   rules   that   log
	INSERT/UPDATE/DELETE on T1 in T2 (like in the  regression
	tests  for rules I created) and grants ALL but RULE on T1
	to user B.  User B  can  now  fully  access  T1  and  the
	logging  happens  in  T2.  But user B cannot access T2 at
	all, only the rule actions can. And due to  missing  RULE
	permissions on T1, user B cannot disable logging.

	Rules  on  the  attribute  level are disabled (they don't
	work properly and since regular users are  now  permitted
	to create rules I decided to disable them).

	Rules  on  select  must have exactly one action that is a
	select (so select rules must be a view definition).

	UPDATE NEW/OLD rules  are  disabled  (still  broken,  but
	triggers can do it).

	There are two new system views (pg_rule and pg_view) that
	show the definition of the rules or views so the db admin
	can  see  what  the  users do. They use two new functions
	pg_get_ruledef() and pg_get_viewdef() that are  builtins.

	The functions pg_get_ruledef() and pg_get_viewdef() could
	be used to implement rule and view support in pg_dump.

	PostgreSQL is now the only database system I  know,  that
	has rewrite rules on the query level. All others (where I
	found a  rule  statement  at  all)  use  stored  database
	procedures  or  the  like  (triggers as we call them) for
	active rules (as some call them).

    Future of the rule system:

	The now disabled parts  of  the  rule  system  (attribute
	level,  multiple  actions on select and update new stuff)
	require a complete new rewrite handler from scratch.  The
	old one is too badly wired up.

	After  6.4  I'll  start to work on a new rewrite handler,
	that fully supports the attribute level  rules,  multiple
	actions on select and update new.  This will be available
	for 6.5 so we get full rewrite rule capabilities.

Jan

if MULTIBYTE is not enabled. So be sure to run initdb.

o these patches are made against the latest source tree (after
Bruce's massive patch, I think) BTW, I noticed that after running
regression, the oid field of pg_type seems disappeared.

	regression=> select oid from pg_type; ERROR:  attribute
	'oid' not found

this happens after the constraints test. This occures with/without
my patches. strange...

o pg_database_mb.h, pg_class_mb.h, pg_attribute_mb.h are no longer
used, and shoud be removed.

o GetDatabaseInfo() in utils/misc/database.c removed (actually in
#ifdef 0). seems nobody uses.

t-ishii@sra.co.jp

is a working 64-bit-int type available.

In playing around with it on my machine, I found that gcc provides
perfectly fine support for "long long" arithmetic ... but sprintf()
and sscanf(), which are system-supplied, don't work :-(.  So the
autoconf test program does a cursory test on them too.

If we find that a lot of systems are like this, it might be worth
the trouble to implement binary<->ASCII conversion of int64 ourselves
rather than relying on sprintf/sscanf to handle the data type.

			regards, tom lane

no longer returns buffer pointer, can be gotten from scan;
	descriptor; bootstrap can create multi-key indexes;
pg_procname index now is multi-key index; oidint2, oidint4, oidname
are gone (must be removed from regression tests); use System Cache
rather than sequential scan in many places; heap_modifytuple no
longer takes buffer parameter; remove unused buffer parameter in
a few other functions; oid8 is not index-able; remove some use of
single-character variable names; cleanup Buffer variables usage
and scan descriptor looping; cleaned up allocation and freeing of
tuples; 18k lines of diff;

From: Jan Wieck <jwieck@debis.com>

Hi,

    as  proposed here comes the first patch for the query rewrite
    system.

  <for details, see archive dated Mon, 17 Aug 1998>

 in constraint clauses.
 IN and NOT IN only allow constaints, not subselects.
Jose' Soares' new reference docs pointed out the discrepency.
 Updating the docs too...

 in type checking for DEFAULT contraint clauses.
Could do more type coersion later...

Date: Sun, 16 Aug 1998 14:56:48 -0400
From: Tom Lane <tgl@sss.pgh.pa.us>
Attached is a patch for this weekend's work on libpq.  I've dealt
with several issues:

        <for details: see message, in pgsql-patches archive for above data>

Previously, had thrown an error, but looking for alternate strategies
 for table indices utilization would prefer to continue.

Don't bother checking for alternate strategies if so
 since it was more likely a function or some other non-operator anyway.

Bracket things with #ifdef ENABLE_LINE_TYPE.
The line data type has always been used internally to support other types,
 but I/O routines have never been defined for it.

 indices for restriction clauses containing a constant.
Note that if an index does not match directly (usually because the types
 on both side of the clause don't match), and if a binary-compatible index
 is identified, then the operator function will be replaced by a new
 one. Should not be a problem, but be sure that if types are listed as
 being binary compatible (in parse_coerce.h) then the comparison functions
 are also binary-compatible, giving equivalent results.

    functions btrim() ltrim() and rtrim().

    The error was that the character after the set  was  included
    in the tests (ptr2 pointed to the character after the vardata
    part of set if no match found,  so  comparing  *ptr  or  *end
    against *ptr2 MAY match -> strip).


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) #