TODO list for PostgreSQL
========================
-Last updated: Sat Sep 18 16:37:37 EDT 1999
+Last updated: Tue Sep 21 15:54:14 EDT 1999
Current maintainer: Bruce Momjian (maillist@candle.pha.pa.us)
INSERT INTO inherit_table (unique_index_col) VALUES (dup) should fail
* CREATE TABLE x AS SELECT 1 UNION SELECT 2 fails
* CREATE TABLE test(col char(2) DEFAULT user) fails in length restriction
+* mismatched types in CREATE TABLE ... DEFAULT causes problems
+ (see TODO.detail/default)
* SELECT ... UNION ... ORDER BY fails when sort expr not in result list
* Be smarter about promoting types when UNION merges different data types
* SELECT ... UNION ... GROUP BY fails if column types disagree
COMMANDS
* ALTER TABLE ADD COLUMN to inherited table put column in wrong place
+ (see TODO.detail/inherit)
* Add ALTER TABLE DROP/ALTER COLUMN feature
* Allow CLUSTER on all tables at once, and improve CLUSTER
* Generate error on CREATE OPERATOR of ~~, ~ and and ~*
* Auto-destroy sequence on DROP of table with SERIAL(Ryan)
* Allow LOCK TABLE tab1, tab2, tab3 so all tables locked in unison
* Allow INSERT/UPDATE of system-generated oid value for a row
-* Allow ESCAPE '\' at the end of LIKE for ANSI compliance
+* Allow ESCAPE '\' at the end of LIKE for ANSI compliance(see TODO.detail/like)
* Rewrite the LIKE handling by rewriting the user string with the
- supplied ESCAPE
+ supplied ESCAPE(see TODO.detail/like)
* Move LIKE index optimization handling to the optimizer
* Allow RULE recompilation
* Support UNION/INTERSECT/EXCEPT in sub-selects
* Put sort files, large objects in their own directory
* Do autocommit so always in a transaction block(?)
* Show location of syntax error in query (see TODO.detail/yacc)
-* Redesign the function call interface to handle NULLs better(Jan)
+* Redesign the function call interface to handle NULLs better
+ (see TODO.detail/function)
* Document/trigger/rule so changes to pg_shadow recreate pg_pwd
(see TODO.detail/pg_shadow)
* Missing optimizer selectivities for date, r-tree, etc.
allocation(see TODO.detail/memory)
* fix memory leak in cache code when non-existant table is referenced
* In WHERE tab1.x=3 AND tab1.x=tab2.y, add tab2.y=3
-* pass atttypmod through parser in more cases(Bruce)
+* pass atttypmod through parser in more cases(see TODO.detail/atttypmod)
* remove duplicate type in/out functions for disk and net
* change VACUUM ANALYZE to use btree comparison functions, not <,=,> calls
* Allow persistent backends(see TODO.detail/persistent)
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+From tgl@sss.pgh.pa.us Sun May 23 12:32:34 1999
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+To: Bruce Momjian <maillist@candle.pha.pa.us>
+cc: PostgreSQL-development <pgsql-hackers@postgreSQL.org>
+Subject: Re: [HACKERS] DEFAULT fixed
+In-reply-to: Your message of Sat, 22 May 1999 21:12:19 -0400 (EDT)
+ <199905230112.VAA13489@candle.pha.pa.us>
+Date: Sun, 23 May 1999 12:32:01 -0400
+Message-ID: <19923.927477121@sss.pgh.pa.us>
+From: Tom Lane <tgl@sss.pgh.pa.us>
+Status: ROr
+
+Bruce Momjian <maillist@candle.pha.pa.us> writes:
+>> It might be best to just bite the bullet and make the parser carry
+>> around both the type's OID and typmod at all times.
+
+> I will try to add it, but I must not that there are some cases where I
+> don't have access to the atttypmod of the result, so it may not be
+> possible to do it in every case. Perhaps I should just leave this for
+> post 6.5, because we don't have any other bug reports on it.
+
+After further thought, I think this may be a more difficult and subtle
+issue than we've realized. In the current state of the system, there
+are many places where you have a value that you can only know the type
+OID for, not atttypmod --- specifically, any intermediate expression
+result. Barring reworking the entire function-call mechanism to pass
+atttypmod around, that's not going to be possible to change.
+
+The only context where you really know atttypmod is where you have
+just fetched a value out of a table column or are about to store a
+value into a table column. When storing, you need to be prepared to
+coerce the given value to the right type if *either* type OID or
+atttypmod is different --- but, in general, you don't know atttypmod
+for the given value. (In the cases I know of, you can deduce it by
+examining the value itself, but this requires type-specific knowledge.)
+
+So on the whole I think this is something that has to be dealt with
+at the point of storing data into a tuple. Maybe we need a new
+fundamental operation for types that pay attention to atttypmod:
+"make this value match the typmod of the target column, which is
+thus-and-so". Trying to attack the problem from the source side by
+propagating typmod all around the parser is probably doomed to failure,
+because there will be many contexts where there's no way to know it.
+
+Since you have a fix for the only symptom reported to date, I'm
+inclined to agree that we should leave well enough alone for now;
+there are other, bigger, problems that we need to address for 6.5.
+But I think we'll have to come back to this issue later.
+
+ regards, tom lane
+
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+From tgl@sss.pgh.pa.us Sun May 23 18:59:22 1999
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+To: Bruce Momjian <maillist@candle.pha.pa.us>
+cc: PostgreSQL-development <pgsql-hackers@postgreSQL.org>
+Subject: Re: [HACKERS] DEFAULT fixed
+In-reply-to: Your message of Sat, 22 May 1999 21:12:19 -0400 (EDT)
+ <199905230112.VAA13489@candle.pha.pa.us>
+Date: Sun, 23 May 1999 18:58:52 -0400
+Message-ID: <27950.927500332@sss.pgh.pa.us>
+From: Tom Lane <tgl@sss.pgh.pa.us>
+Status: ROr
+
+Actually, it's not as fixed as all that...
+
+create table foo1 (a char(5) default '', b int4);
+insert into foo1 (b) values (334);
+select * from foo1;
+a | b
+-----+---
+ |334
+(1 row)
+
+Good, the basic case is fixed, but:
+
+create table foo2 (a char(5) default text '', b int4);
+insert into foo2 (b) values (334);
+select * from foo2;
+a| b
+-+--
+ |16
+(1 row)
+
+Ooops.
+
+What you seem to have done is twiddle the handling of DEFAULT clauses
+so that the value stored for the default expression is pre-coerced to the
+column type. That's good as far as it goes, but it fails in cases where
+the stored value has to be of a different type.
+
+My guess is that what *really* ought to happen here is that
+transformInsertStmt should check the type of the value it's gotten from
+the default clause and apply coerce_type if necessary.
+
+Unless someone can come up with a less artificial example than the one
+above, I'm inclined to leave it alone for 6.5. This is the same code
+area that will have to be redone to fix the INSERT ... SELECT problem
+I was chasing earlier today: coercion of the values produced by SELECT
+will have to wait until the tail end of transformInsertStmt, and we
+might as well make wrong-type default constants get fixed in the same
+place. So I'm not eager to write some throwaway code to patch a problem
+that no one is likely to see in practice. What's your feeling about it?
+
+ regards, tom lane
+
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+From tgl@sss.pgh.pa.us Mon Jun 14 20:50:41 1999
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+ Mon, 14 Jun 1999 20:51:07 -0400 (EDT)
+To: Bruce Momjian <maillist@candle.pha.pa.us>
+cc: Roman.Hodek@informatik.uni-erlangen.de, olly@lfix.co.uk,
+ PostgreSQL-development <pgsql-hackers@postgreSQL.org>
+Subject: Cleaning up function interface (was Re: Patch for m68k architecture)
+In-reply-to: Your message of Mon, 14 Jun 1999 17:53:25 -0400 (EDT)
+ <199906142153.RAA16276@candle.pha.pa.us>
+Date: Mon, 14 Jun 1999 20:51:06 -0400
+Message-ID: <21504.929407866@sss.pgh.pa.us>
+From: Tom Lane <tgl@sss.pgh.pa.us>
+Status: RO
+
+Bruce Momjian <maillist@candle.pha.pa.us> writes:
+>> ANSI C says results are undefined if you call a function via pointer
+>> and the pointer is declared to return another type than the function
+>> actually returns. So m68k compilers conform to the standard here.
+
+> Yes, we admit that we break the standard with fmgr_ptr, because we
+> return a variety of values depending on what function they call. It
+> appears the egcs optimization on the powerpc or alpha cause a problem
+> when optimization is -O2, but not -O. We may see more platforms with
+> problems as optimizers get smarter.
+
+Seeing as how we also know that the function-call interface ought to be
+redesigned to handle NULLs better, maybe we should just bite the bullet
+and fix all of these problems at once by adopting a new standard
+interface for everything that can be called via fmgr. It'd uglify the
+code, no doubt, but I think we are starting to see an accumulation of
+problems that justify doing something.
+
+Here is a straw-man proposal:
+
+ Datum function (bool *resultnull,
+ Datum *args,
+ bool *argnull,
+ int nargs)
+
+args[i] is the i'th parameter, or undefined (perhaps always 0?)
+when argnull[i] is true. The function is responsible for setting
+*resultnull, and returns a Datum value if *resultnull is false.
+Most standard functions could ignore nargs since they'd know what it
+should be, but we ought to pass it for flexibility.
+
+A useful addition to this scheme would be for fmgr to preset *resultnull
+to the OR of the input argnull[] array just before calling the function.
+In the typical case where the function is "strict" (ie, result is NULL
+if any input is NULL), this would save the function from having to look
+at argnull[] at all; it'd just check *resultnull and immediately return
+if true.
+
+As an example, int4 addition goes from
+
+int32
+int4pl(int32 arg1, int32 arg2)
+{
+ return arg1 + arg2;
+}
+
+to
+
+Datum
+int4pl (bool *resultnull, Datum *args, bool *argnull, int nargs)
+{
+ if (*resultnull)
+ return (Datum) 0; /* value doesn't really matter ... */
+ /* we can ignore argnull and nargs */
+
+ return Int32GetDatum(DatumGetInt32(args[0]) + DatumGetInt32(args[1]));
+}
+
+This is, of course, much uglier than the existing code, but we might be
+able to improve matters with some well-chosen macros for the boilerplate
+parts. What we actually end up writing might look something like
+
+Datum
+int4pl (PG_FUNCTION_ARGS)
+{
+ PG_STRICT_FUNCTION( /* encapsulates null check */
+ PG_ARG0_INT32;
+ PG_ARG1_INT32;
+
+ PG_RESULT_INT32( arg0 + arg1 );
+ );
+}
+
+where the macros expand to things like "int32 arg0 = DatumGetInt32(args[0])"
+and "return Int32GetDatum( x )". It'd be worth a little thought to
+try to set up a group of macros like that, I think.
+
+ regards, tom lane
+
--- /dev/null
+From owner-pgsql-hackers@hub.org Tue Jun 1 22:31:18 1999
+Received: from renoir.op.net (root@renoir.op.net [209.152.193.4])
+ by candle.pha.pa.us (8.9.0/8.9.0) with ESMTP id WAA09988
+ for <maillist@candle.pha.pa.us>; Tue, 1 Jun 1999 22:31:17 -0400 (EDT)
+Received: from hub.org (hub.org [209.167.229.1]) by renoir.op.net (o1/$Revision: 1.1 $) with ESMTP id WAA18944 for <maillist@candle.pha.pa.us>; Tue, 1 Jun 1999 22:08:09 -0400 (EDT)
+Received: from hub.org (hub.org [209.167.229.1])
+ by hub.org (8.9.3/8.9.3) with ESMTP id WAA75604;
+ Tue, 1 Jun 1999 22:01:31 -0400 (EDT)
+ (envelope-from owner-pgsql-hackers@hub.org)
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+ (envelope-from chris.bitmead@bigfoot.com)
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+ for <pgsql-hackers@hub.org>; Wed, 2 Jun 1999 10:50:11 +1000
+Message-ID: <37547FC3.40106A5E@bigfoot.com>
+Date: Wed, 02 Jun 1999 10:50:11 +1000
+From: Chris Bitmead <chris.bitmead@bigfoot.com>
+X-Mailer: Mozilla 4.6 [en] (X11; I; Linux 2.2.6 i686)
+X-Accept-Language: en
+MIME-Version: 1.0
+To: pgsql-hackers@hub.org
+Subject: Re: [HACKERS] ALTER TABLE ADD COLUMN
+References: <199906011436.KAA23479@candle.pha.pa.us>
+Content-Type: text/plain; charset=us-ascii
+Content-Transfer-Encoding: 7bit
+Sender: owner-pgsql-hackers@postgreSQL.org
+Precedence: bulk
+Status: RO
+
+Bruce Momjian wrote:
+
+> Our TODO now has:
+>
+> * ALTER TABLE ADD COLUMN to inherited table put column in wrong place
+>
+> I don't think any of us understand the issues on this one.
+
+Let me guess at the problem. When you add a column, it doesn't change
+all the records, therefore the column must be added at the end. This
+means that the columns will not be in the same order as if you had
+created them from scratch.
+
+There seem to be three solutions:
+a) Go to a much more sophisticated schema system, with versions and
+version numbers (fairly hard but desirable to fix other schema change
+problems). Then insert the column in the position it is supposed to be
+in.
+
+b) Fix the copy command to input and output the columns, not in the
+order they are in, but in the order they would be in on re-creation.
+
+c) make the copy command take arguments specifying the field names, like
+INSERT can do.
+
+I think it would be good if Postgres had all 3 features. Probably (b) is
+the least work.
+
+
--- /dev/null
+From zalman@netcom.com Tue Mar 16 18:01:18 1999
+Received: from renoir.op.net (root@renoir.op.net [209.152.193.4])
+ by candle.pha.pa.us (8.9.0/8.9.0) with ESMTP id SAA24313
+ for <maillist@candle.pha.pa.us>; Tue, 16 Mar 1999 18:01:17 -0500 (EST)
+Received: from netcom15.netcom.com (zalman@netcom15.netcom.com [192.100.81.128]) by renoir.op.net (o1/$Revision: 1.1 $) with ESMTP id RAA15235 for <maillist@candle.pha.pa.us>; Tue, 16 Mar 1999 17:56:56 -0500 (EST)
+Received: (from zalman@localhost)
+ by netcom15.netcom.com (8.8.5-r-beta/8.8.5/(NETCOM v1.02)) id OAA28174;
+ Tue, 16 Mar 1999 14:55:33 -0800 (PST)
+From: Zalman Stern <zalman@netcom.com>
+Message-Id: <199903162255.OAA28174@netcom15.netcom.com>
+Subject: Re: [SQL] How match percent sign in SELECT using LIKE?
+To: maillist@candle.pha.pa.us (Bruce Momjian)
+Date: Tue, 16 Mar 1999 14:55:33 -0800 (PST)
+Cc: zalman@netcom.com, herouth@oumail.openu.ac.il, pgsql-sql@postgreSQL.org
+In-Reply-To: <199903162226.RAA20904@candle.pha.pa.us> from "Bruce Momjian" at Mar 16, 99 05:26:09 pm
+X-Mailer: ELM [version 2.4 PL25]
+MIME-Version: 1.0
+Content-Type: text/plain; charset=US-ASCII
+Content-Transfer-Encoding: 7bit
+Status: ROr
+
+Bruce Momjian wrote:
+> That is also an excellent idea. Just convert their escape to \ inside
+> the parser. Of course, they still have to use \\ to get a \, as in any
+> string. Great idea.
+
+You can even make it fully compliant if you want. (There are of course
+backward compatibility problems. I'm not sure what the Postgres policy is
+on this.)
+
+- If the escape character is backslash, do nothing.
+- Otherwise, turn all backslashes in the string to double backslashes.
+- If the escape character is not set, stop here.
+- Turn all occurences of the escape character into a backslash except
+ where the escape character is doubled, where it should be made into a
+ single occurence.
+(Optionally, if "\n" is just an 'n' character, you can handle double
+occurences of the escape character by turning the first one into a
+backslash.)
+
+Probably the best bet for PostgreSQL programmers is to always code Like
+clauses with an ESCAPE '\' (or however its written).
+
+I really wish they'd chosen a character other than underscore for the
+"match one" wildcard... Is there any standard practice for seperating words
+in table names?
+
+-Z-
+
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Vadim
+From owner-pgsql-hackers@hub.org Tue Sep 21 05:31:11 1999
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+ id m11TLQP-0003kLC; Tue, 21 Sep 99 10:37 MET DST
+Message-Id: <m11TLQP-0003kLC@orion.SAPserv.Hamburg.dsh.de>
+From: wieck@debis.com (Jan Wieck)
+Subject: [HACKERS] Re: Referential Integrity In PostgreSQL
+To: pgsql-hackers@postgreSQL.org (PostgreSQL HACKERS)
+Date: Tue, 21 Sep 1999 10:37:21 +0200 (MET DST)
+Reply-To: wieck@debis.com (Jan Wieck)
+X-Mailer: ELM [version 2.4 PL25]
+Content-Type: text
+Sender: owner-pgsql-hackers@postgreSQL.org
+Precedence: bulk
+Status: RO
+
+>
+> Hi , Jan
+>
+> my name is Max .
+
+Hi Max,
+
+>
+> I have contributed to SPI interface ,
+> that with external Trigger try to make
+> a referential integrity.
+>
+> If I can Help , in something ,
+> I'm here .
+>
+
+ You're welcome.
+
+ I've CC'd the hackers list because we might get some ideas
+ from there too (and to surface once in a while - Bruce
+ already missed me).
+
+ Currently I'm very busy for serious work so I don't find
+ enough spare time to start on such a big change to
+ PostgreSQL. But I'd like to give you an overview of what I
+ have in mind so far so you can decide if you're able to help.
+
+ Referential integrity (RI) is based on constraints defined in
+ the schema of a database. There are some different types of
+ constraints:
+
+ 1. Uniqueness constraints.
+
+ 2. Foreign key constraints that ensure that a key value used
+ in an attribute exists in another relation. One
+ constraint must ensure you're unable to INSERT/UPDATE to
+ a value that doesn't exist, another one must prevent
+ DELETE on a referenced key item or that it is changed
+ during UPDATE.
+
+ 3. Cascading deletes that let rows referring to a key follow
+ on DELETE silently.
+
+ Even if not defined in the standard (AFAIK) there could be
+ others like letting references automatically follow on UPDATE
+ to a key value.
+
+ All constraints can be enabled and/or default to be deferred.
+ That means, that the RI checks aren't performed when they are
+ triggerd. Instead, they're checked at transaction end or if
+ explicitly invoked by some special statement. This is really
+ important because someone must be able to setup cyclic RI
+ checks that could never be satisfied if the checks would be
+ performed immediately. The major problem on this is the
+ amount of data affected until the checks must be performed.
+ The number of statements executed, that trigger such deferred
+ constraints, shouldn't be limited. And one single
+ INSERT/UPDATE/DELETE could affect thousands of rows.
+
+ Due to these problems I thought, it might not be such a good
+ idea to remember CTID's or the like to get back OLD/NEW rows
+ at the time the constraints are checked. Instead I planned to
+ misuse the rule system for it. Unfortunately, the rule system
+ has damned tricky problems itself when it comes to having-,
+ distinct and other clauses and extremely on aggregates and
+ subselects. These problems would have to get fixed first. So
+ it's a solution that cannot be implemented right now.
+
+ Fallback to CTID remembering though. There are problems too
+ :-(. Let's enhance the trigger mechanism with a deferred
+ feature. First this requires two additional bool attributes
+ in the pg_trigger relation that tell if this trigger is
+ deferrable and if it is deferred by default. While at it we
+ should add another bool that tells if the trigger is enabled
+ (ALTER TRIGGER {ENABLE|DISABLE} trigger).
+
+ Second we need an internal list of triggers, that are
+ currently DEFINED AS DEFERRED. Either because they default to
+ it, or the user explicitly asked to deferr it.
+
+ Third we need an internal list of triggers that must be
+ invoked later because at the time an event occured where they
+ should have been triggered, they appeared in the other list
+ and their execution is delayed until transaction end or
+ explicit execution. This list must remember the OID of the
+ trigger to invoke (to identify the procedure and the
+ arguments), the relation that caused the trigger and the
+ CTID's of the OLD and NEW row.
+
+ That last list could grow extremely! Think of a trigger
+ that's executing commands over SPI which in turn activate
+ deferred triggers. Since the order of trigger execution is
+ very important for RI, I can't see any chance to
+ simplify/condense this information. Thus it is 16 bytes at
+ least per deferred trigger call (2 OID's plus 2 CTID's). I
+ think one or more temp files would fit best for this.
+
+ A last tricky point is if one of a bunch of deferred triggers
+ is explicitly called for execution. At this time, the entries
+ for it in the temp file(s) must get processed and marked
+ executed (maybe by overwriting the triggers OID with the
+ invalid OID) while other trigger events still have to get
+ recorded.
+
+ Needless to say that reading thousands of those entries just
+ to find a few isn't good on performance. But better have this
+ special case slow that dealing with hundreds of temp files or
+ other overhead slowing down the usual case where ALL deferred
+ triggers get called at transaction end.
+
+ Trigger invocation is simple now - fetch the OLD and NEW rows
+ by CTID and execute the trigger as done by the trigger
+ manager. Oh - well - vacuum shouldn't touch relations where
+ deferred triggers are outstanding. Might require some
+ special lock entry - Vadim?
+
+ Did I miss something?
+
+
+Jan
+
+--
+
+#======================================================================#
+# It's easier to get forgiveness for being wrong than for being right. #
+# Let's break this rule - forgive me. #
+#========================================= wieck@debis.com (Jan Wieck) #
+
+************
+
+
+From owner-pgsql-hackers@hub.org Tue Sep 21 08:31:03 1999
+Received: from renoir.op.net (root@renoir.op.net [209.152.193.4])
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+ id m11TOGd-0003kwC; Tue, 21 Sep 99 13:39 MET DST
+Message-Id: <m11TOGd-0003kwC@orion.SAPserv.Hamburg.dsh.de>
+From: wieck@debis.com (Jan Wieck)
+Subject: Re: [HACKERS] Re: Referential Integrity In PostgreSQL
+To: andreas.zeugswetter@telecom.at (Andreas Zeugswetter)
+Date: Tue, 21 Sep 1999 13:39:27 +0200 (MET DST)
+Cc: hackers@postgresql.org
+Reply-To: wieck@debis.com (Jan Wieck)
+In-Reply-To: <37E74EB9.44F9766E@telecom.at> from "Andreas Zeugswetter" at Sep 21, 99 11:24:09 am
+X-Mailer: ELM [version 2.4 PL25]
+Content-Type: text
+Sender: owner-pgsql-hackers@postgresql.org
+Precedence: bulk
+Status: RO
+
+>
+> > Oh - well - vacuum shouldn't touch relations where
+> > deferred triggers are outstanding. Might require some
+> > special lock entry - Vadim?
+>
+> All modified data will be in this same still open transaction.
+> Therefore no relevant data can be removed by vacuum anyway.
+
+ I expect this, but I really need to be sure that not even the
+ location of the tuple in the heap will change. I need to find
+ the tuples at the time the deferred triggers must be executed
+ via heap_fetch() by their CTID!
+
+>
+> It is my understanding, that the RI check is performed on the newest
+> available (committed) data (+ modified data from my own tx).
+> E.g. a primary key that has been removed by another transaction after
+> my begin work will lead to an RI violation if referenced as foreign key.
+
+ Absolutely right. The function that will fire the deferred
+ triggers must switch to READ COMMITTED isolevel while doing
+ so.
+
+ What I'm not sure about is which snapshot to use to get the
+ OLD tuples (outdated in this transaction by a previous
+ command). Vadim?
+
+
+Jan
+
+--
+
+#======================================================================#
+# It's easier to get forgiveness for being wrong than for being right. #
+# Let's break this rule - forgive me. #
+#========================================= wieck@debis.com (Jan Wieck) #
+
+
+
+************
+
+
+From owner-pgsql-hackers@hub.org Tue Sep 21 10:45:40 1999
+Received: from hub.org (hub.org [216.126.84.1])
+ by candle.pha.pa.us (8.9.0/8.9.0) with ESMTP id KAA10993
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+ (envelope-from vadim@krs.ru)
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+Message-ID: <37E79730.CC415030@krs.ru>
+Date: Tue, 21 Sep 1999 22:33:20 +0800
+From: Vadim Mikheev <vadim@krs.ru>
+Organization: OJSC Rostelecom (Krasnoyarsk)
+X-Mailer: Mozilla 4.5 [en] (X11; I; FreeBSD 3.0-RELEASE i386)
+X-Accept-Language: ru, en
+MIME-Version: 1.0
+To: Jan Wieck <wieck@debis.com>
+CC: Andreas Zeugswetter <andreas.zeugswetter@telecom.at>,
+ hackers@postgreSQL.org
+Subject: Re: [HACKERS] Re: Referential Integrity In PostgreSQL
+References: <m11TOGd-0003kwC@orion.SAPserv.Hamburg.dsh.de>
+Content-Type: text/plain; charset=us-ascii
+Content-Transfer-Encoding: 7bit
+Sender: owner-pgsql-hackers@postgreSQL.org
+Precedence: bulk
+Status: RO
+
+Jan Wieck wrote:
+>
+> > It is my understanding, that the RI check is performed on the newest
+> > available (committed) data (+ modified data from my own tx).
+> > E.g. a primary key that has been removed by another transaction after
+> > my begin work will lead to an RI violation if referenced as foreign key.
+>
+> Absolutely right. The function that will fire the deferred
+> triggers must switch to READ COMMITTED isolevel while doing
+ ^^^^^^^^^^^^^^
+> so.
+
+NO!
+What if one transaction deleted PK, another one inserted FK
+and now both performe RI check? Both transactions _must_
+use DIRTY READs to notice that RI violated by another
+in-progress transaction and wait for concurrent transaction...
+
+BTW, using triggers to check _each_ modified tuple
+(i.e. run Executor for each modified tuple) is bad for
+performance. We could implement direct support for
+standard RI constraints.
+
+Using rules (statement level triggers) for INSERT...SELECT,
+UPDATE and DELETE queries would be nice! Actually, RI constraint
+checks need in very simple queries (i.e. without distinct etc)
+and the only we would have to do is
+
+> What I'm not sure about is which snapshot to use to get the
+> OLD tuples (outdated in this transaction by a previous
+> command). Vadim?
+
+1. Add CommandId to Snapshot.
+2. Use Snapshot->CommandId instead of global CurrentScanCommandId.
+3. Use Snapshots with different CommandId-s to get OLD/NEW
+ versions.
+
+But I agreed that the size of parsetrees may be big and for
+COPY...FROM/INSERTs we should remember IDs of modified
+tuples. Well. Please remember that I implement WAL right
+now, already have 1000 lines of code and hope to run first
+tests after writing additional ~200 lines -:)
+We could read modified tuple IDs from WAL...
+
+Vadim
+
+************
+
+
+From owner-pgsql-hackers@hub.org Tue Sep 21 11:18:19 1999
+Received: from hub.org (hub.org [216.126.84.1])
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+ id m11TRKP-0003kLC; Tue, 21 Sep 99 16:55 MET DST
+Message-Id: <m11TRKP-0003kLC@orion.SAPserv.Hamburg.dsh.de>
+From: wieck@debis.com (Jan Wieck)
+Subject: Re: [HACKERS] Re: Referential Integrity In PostgreSQL
+To: vadim@krs.ru (Vadim Mikheev)
+Date: Tue, 21 Sep 1999 16:55:33 +0200 (MET DST)
+Cc: wieck@debis.com, andreas.zeugswetter@telecom.at, hackers@postgreSQL.org
+Reply-To: wieck@debis.com (Jan Wieck)
+In-Reply-To: <37E79730.CC415030@krs.ru> from "Vadim Mikheev" at Sep 21, 99 10:33:20 pm
+X-Mailer: ELM [version 2.4 PL25]
+Content-Type: text
+Sender: owner-pgsql-hackers@postgreSQL.org
+Precedence: bulk
+Status: RO
+
+>
+> Jan Wieck wrote:
+> >
+> > > It is my understanding, that the RI check is performed on the newest
+> > > available (committed) data (+ modified data from my own tx).
+> > > E.g. a primary key that has been removed by another transaction after
+> > > my begin work will lead to an RI violation if referenced as foreign key.
+> >
+> > Absolutely right. The function that will fire the deferred
+> > triggers must switch to READ COMMITTED isolevel while doing
+> ^^^^^^^^^^^^^^
+> > so.
+>
+> NO!
+> What if one transaction deleted PK, another one inserted FK
+> and now both performe RI check? Both transactions _must_
+> use DIRTY READs to notice that RI violated by another
+> in-progress transaction and wait for concurrent transaction...
+
+ Oh - I see - yes.
+
+>
+> BTW, using triggers to check _each_ modified tuple
+> (i.e. run Executor for each modified tuple) is bad for
+> performance. We could implement direct support for
+> standard RI constraints.
+
+ As I want to implement it, there would be not much difference
+ between a regular trigger invocation and a deferred one. If
+ that causes a performance problem, I think we should speed up
+ the trigger call mechanism in general instead of not using
+ triggers.
+
+>
+> Using rules (statement level triggers) for INSERT...SELECT,
+> UPDATE and DELETE queries would be nice! Actually, RI constraint
+> checks need in very simple queries (i.e. without distinct etc)
+> and the only we would have to do is
+>
+> > What I'm not sure about is which snapshot to use to get the
+> > OLD tuples (outdated in this transaction by a previous
+> > command). Vadim?
+>
+> 1. Add CommandId to Snapshot.
+> 2. Use Snapshot->CommandId instead of global CurrentScanCommandId.
+> 3. Use Snapshots with different CommandId-s to get OLD/NEW
+> versions.
+>
+> But I agreed that the size of parsetrees may be big and for
+> COPY...FROM/INSERTs we should remember IDs of modified
+> tuples. Well. Please remember that I implement WAL right
+> now, already have 1000 lines of code and hope to run first
+> tests after writing additional ~200 lines -:)
+> We could read modified tuple IDs from WAL...
+
+ Not only on COPY. One regular INSERT/UPDATE/DELETE statement
+ can actually fire thousands of trigger calls right now. These
+ triggers normally use SPI to execute their own queries. If
+ such a trigger now uses a query that in turn causes a
+ deferred constraint, we might have to save thousands of
+ deferred querytrees - impossible mission.
+
+ That's IMHO a clear drawback against using rules for
+ deferrable RI.
+
+ What I'm currently doing is clearly encapsulated in some
+ functions in commands/trigger.c (except for some additional
+ attributes in pg_trigger). If it later turns out that we can
+ combine the information required into WAL, I think we have
+ time enough to do so and shouldn't really care if v6.6
+ doesn't have it already combined.
+
+
+Jan
+
+--
+
+#======================================================================#
+# It's easier to get forgiveness for being wrong than for being right. #
+# Let's break this rule - forgive me. #
+#========================================= wieck@debis.com (Jan Wieck) #
+
+
+
+************
+
+
+From owner-pgsql-hackers@hub.org Tue Sep 21 15:30:29 1999
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+Message-Id: <m11TUvX-0003kLC@orion.SAPserv.Hamburg.dsh.de>
+From: wieck@debis.com (Jan Wieck)
+Subject: [HACKERS] RI question
+To: pgsql-hackers@postgreSQL.org (PostgreSQL HACKERS)
+Date: Tue, 21 Sep 1999 20:46:06 +0200 (MET DST)
+Reply-To: wieck@debis.com (Jan Wieck)
+X-Mailer: ELM [version 2.4 PL25]
+Content-Type: text
+Sender: owner-pgsql-hackers@postgreSQL.org
+Precedence: bulk
+Status: RO
+
+Uh oh,
+
+ I think deferred RI constraints must only fire the actions
+ that remain after all commands during the entire transaction
+ are condensed to the total minimum required to get that
+ state, because deferred RI must only check what VISIBLY
+ happened during the transaction.
+
+ Thinking on the tuple level, a sequence of
+ INSERT,UPDATE,UPDATE must fire only one INSERT trigger, but
+ with the values of the last UPDATE. An UPDATE,DELETE sequence
+ is in fact a DELETE of the original tuple and an
+ INSERT,UPDATE,DELETE sequence is nothing.
+
+ That means that the recording mechnism of the trigger events
+ must be very smart on UPDATE and DELETE events, looking at
+ the x_min of the old tuple if that resulted from the current
+ transaction. If so, follow the events backward, disable
+ previous ones and change the new event into what it really
+ has to be.
+
+ But some problems remain unsolvable by this:
+
+ - PK has an ON DELETE CASCADE for FK
+ - BEGIN
+ - DELETE PK
+ - INSERT same PK
+ - COMMIT.
+
+ This really shouldn't invoke the cascading delete, because at
+ COMMIT the PK still is there. Same for a constraint that
+ forbids deletion of a PK while referenced by FK. Therefore
+ the deferred event recorder must check on INSERT any previous
+ DELETES for the same relation if the key does match and drop
+ both deferred triggers if so. Therefore it needs to know
+ which attributes build the PK of that relation
+ (<relname>_pkey guaranteed?).
+
+ Well, I think that's finally the death of RI over rules. The
+ code managing those rules during CREATE/ALTER TABLE would
+ become totally unmaintainable. And (sorry Vadim) it's the
+ death of SLT for this too because this event tracking must be
+ done on the tuple level.
+
+ It complicated the trigger approach too, but IMHO not too
+ bad. Anyway, some co-developer(s) doing the parser- and
+ utility-statement stuff (SET CONSTRAINTS ... etc.) would be
+ great.
+
+ Volunteers?
+
+
+Jan
+
+--
+
+#======================================================================#
+# It's easier to get forgiveness for being wrong than for being right. #
+# Let's break this rule - forgive me. #
+#========================================= wieck@debis.com (Jan Wieck) #
+
+
+
+************
+
+
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