SQL3 UNDER

Started by Chris Bitmeadover 25 years ago27 messages
#1Chris Bitmead
chris@bitmead.com

For those interested I've extended the patch to support the SQL3 UNDER
syntax...

ftp://ftp.tech.com.au/pub/diff.x

#2Robert B. Easter
reaster@comptechnews.com
In reply to: Chris Bitmead (#1)
Re: SQL3 UNDER

Mr. Bitmead,

I read your patch (but have not applied it, or tested it exactly). It says
that UNDER supports multiple inheritance as a Postgres language extension. How
about instead, implementing UNDER exactly to the SQL3 spec? For multiple
inheritance, why not just suggest the use of INHERITS, which is
already a Postgres language extension for multiple inheritance. UNDER covers
the tree/hierarchy situation, so make it only to SQL3 standards.
INHERIT fits the clone/copy/inherits situation that, like I've
said before, is like starting a new tree. You could constrain INHERITS to only
accept tables that are maximal supertables. INHERITS probably should not
accept a subtable that is within an UNDER tree - that would add much
complication if allowed. I know that I said that maybe INHERITS should strive
to become UNDER in a prior message. But now I can see exactly how they
complement each other: each provides a different type of inheritance scheme.

(sorry if I seem to keep saying the same things over and over ... again..)
In UNDER, the tables are connected into a tree like one big table with
extensions to it (the subtables). The subtables are dependent on the
supertables so that the supertables cannot be dropped until you drop all its
subtables first. My impression of the subtable-supertable relationship is
that, again, the subtable stores only the subrow it declares. The subrow it
inherited from its supertable is just a link. When inserting, the subtable
stores the subrow it declared, then it accesses its supertable
and inserts the inherited subrow. The subtable is incomplete without accessing
its supertable for the inherited subrow. When you add a column to a superclass,
there should be no need to also add a column to the subclass. The subclass
doesn't store it, but should just begin accepting the new attribute of its
superclass. Isn't this how the SQL3 spec works (I'll have to read it more)?

INHERITS should accept only maximal supertables or tables that are not
part of an UNDER tree. The child table could be independent of the parent
table. The parent table could be dropped without consequence to the child
table since it inherits a copy of all its parent's attributes. While the
parent exists, it would maintain information about all of its children
tables so that it can select down into them (in common attributes only). The
child maintains no linkage to the parent - its inserts etc only affect itself.
This contrasts with UNDER, where a subtable does maintain a link to its
supertable in order to cascade inserts etc to the supertable for the subrow it
inherited.

I hope my comments are helpful! :)

On Mon, 22 May 2000, Chris Bitmead wrote:

For those interested I've extended the patch to support the SQL3 UNDER
syntax...

ftp://ftp.tech.com.au/pub/diff.x

--
Robert B. Easter
reaster@comptechnews.com

#3Hannu Krosing
hannu@tm.ee
In reply to: Chris Bitmead (#1)
Re: SQL3 UNDER

Chris Bitmead wrote:

"Robert B. Easter" wrote:

This contrasts with UNDER, where a subtable does maintain a link to its
supertable in order to cascade inserts etc to the supertable for the subrow it
inherited.

What you have just described for the behaviour of UNDER (as opposed to
implementation) is just how INHERITS works now. i.e. you can't destroy
the parent unless there are no children.

We could supply DROP TABLE parent CASCADE; syntax to destroy bot parent and
all
inherited tables.

---------------------
Hannu

#4Chris Bitmead
chrisb@nimrod.itg.telstra.com.au
In reply to: Chris Bitmead (#1)
Re: SQL3 UNDER

"Robert B. Easter" wrote:

I read your patch (but have not applied it, or tested it exactly). It says
that UNDER supports multiple inheritance as a Postgres language extension. How
about instead, implementing UNDER exactly to the SQL3 spec? For multiple
inheritance, why not just suggest the use of INHERITS, which is
already a Postgres language extension for multiple inheritance. UNDER covers
the tree/hierarchy situation, so make it only to SQL3 standards.
INHERIT fits the clone/copy/inherits situation that, like I've
said before, is like starting a new tree. You could constrain INHERITS to only
accept tables that are maximal supertables. INHERITS probably should not
accept a subtable that is within an UNDER tree - that would add much
complication if allowed. I know that I said that maybe INHERITS should strive
to become UNDER in a prior message. But now I can see exactly how they
complement each other: each provides a different type of inheritance scheme.

As far as I'm concerned, current postgres INHERIT, is exactly the same
semantics as UNDER (apart from multiple inheritance). That being the
case, the only point of retaining INHERIT is legacy. Encouraging use of
a completely different syntax just for multiple inheritance seems
foolish.

If you think the semantics are different provide a specific example
(including SQL) of how you think their behaviour is different - that is
how you think UNDER should work differently to current INHERIT.

(sorry if I seem to keep saying the same things over and over ... again..)
In UNDER, the tables are connected into a tree like one big table with
extensions to it (the subtables). The subtables are dependent on the
supertables so that the supertables cannot be dropped until you drop all its
subtables first. My impression of the subtable-supertable relationship is
that, again, the subtable stores only the subrow it declares. The subrow it
inherited from its supertable is just a link. When inserting, the subtable
stores the subrow it declared, then it accesses its supertable
and inserts the inherited subrow. The subtable is incomplete without accessing
its supertable for the inherited subrow. When you add a column to a superclass,
there should be no need to also add a column to the subclass. The subclass
doesn't store it, but should just begin accepting the new attribute of its
superclass. Isn't this how the SQL3 spec works (I'll have to read it more)?

That kinda sounds like how SQL3 describes the model. But it doesn't mean
we have to implement it that way to provide the same behaviour. And in
fact we don't, and I don't think we should either.

INHERITS should accept only maximal supertables or tables that are not
part of an UNDER tree. The child table could be independent of the parent
table. The parent table could be dropped without consequence to the child
table since it inherits a copy of all its parent's attributes. While the
parent exists, it would maintain information about all of its children
tables so that it can select down into them (in common attributes only). The
child maintains no linkage to the parent - its inserts etc only affect itself.
This contrasts with UNDER, where a subtable does maintain a link to its
supertable in order to cascade inserts etc to the supertable for the subrow it
inherited.

What you have just described for the behaviour of UNDER (as opposed to
implementation) is just how INHERITS works now. i.e. you can't destroy
the parent unless there are no children. While I think the ability to
destroy a parent would be a good feature (for evolving a schema for
example), it hardly amounts to a whole new model. The time to decide you
want the ability to destroy a parent, is when you've decided to destroy
a parent, not when you created a child. As far as I'm concerned, the
more wierd and wonderful ways to evolve the schema without destroying
data the better.

In general, I think you concentrating too hard on implementation as
opposed to semantics. Try to crystalise the semantics first, then
implementation can be chosen on performance.

#5Robert B. Easter
reaster@comptechnews.com
In reply to: Chris Bitmead (#4)
Re: SQL3 UNDER

On Tue, 23 May 2000, Chris Bitmead wrote:

If you think the semantics are different provide a specific example
(including SQL) of how you think their behaviour is different - that is
how you think UNDER should work differently to current INHERIT.

I'll try to provide examples later. For now, did you see the gif attachments
on a earlier message of mine? The UNDER and CLONES/INHERITS gif pictures
provide a graphical view of what I mean. UNDER creates tree hierarchy down
vertically, while INHERITS supports multiple inheritance in a lateral
direction. The UNDER trees can be under any table that is part of an INHERITS
relationship. UNDER and INHERITS work at different levels sorta. A subtable
in an UNDER hierarchy can't be in an INHERITS clause because it is logically
just part of its maximal supertable. In other words, INHERITS can provide a
relationship between different whole trees created by UNDER, by way of a
maximal supertable being inherited by another maximal supertable with its own
UNDER tree. Make any sense? :-)

--
Robert B. Easter
reaster@comptechnews.com

#6Chris Bitmead
chris@bitmead.com
In reply to: Chris Bitmead (#1)
Re: SQL3 UNDER



I'll try to provide examples later. For now, did you see the gif
attachments on a earlier message of mine?

I didn't before, but I do now.

The UNDER and CLONES/INHERITS gif pictures
provide a graphical view of what I mean. UNDER creates tree hierarchy
down vertically, while INHERITS supports multiple inheritance in a
lateral direction. The UNDER trees can be under any table that is part
of an INHERITS relationship. UNDER and INHERITS work at different
levels sorta. A subtable in an UNDER hierarchy can't be in an INHERITS > clause because it is logically just part of its maximal supertable. In
other words, INHERITS can provide a relationship between different
whole trees created by UNDER, by way of a maximal supertable being
inherited by another maximal supertable with its own
UNDER tree. Make any sense? :-)

I'm afraid not. Show me the (SQL) code :-).

#7Robert B. Easter
reaster@comptechnews.com
In reply to: Chris Bitmead (#6)
Re: SQL3 UNDER

On Tue, 23 May 2000, Chris Bitmead wrote:



I'll try to provide examples later. For now, did you see the gif
attachments on a earlier message of mine?

I didn't before, but I do now.

The UNDER and CLONES/INHERITS gif pictures
provide a graphical view of what I mean. UNDER creates tree hierarchy
down vertically, while INHERITS supports multiple inheritance in a
lateral direction. The UNDER trees can be under any table that is part
of an INHERITS relationship. UNDER and INHERITS work at different
levels sorta. A subtable in an UNDER hierarchy can't be in an INHERITS > clause because it is logically just part of its maximal supertable. In
other words, INHERITS can provide a relationship between different
whole trees created by UNDER, by way of a maximal supertable being
inherited by another maximal supertable with its own
UNDER tree. Make any sense? :-)

I'm afraid not. Show me the (SQL) code :-).

=======
Tree 1
=======
CREATE TABLE maxsuper1 (
ms1_id INTEGER PRIMARY KEY,
...
);

CREATE TABLE sub1a (
name VARCHAR(50);
) UNDER maxsuper1; -- maxsuper1.ms1_id is PRIMARY KEY

=======
Tree 2
=======
CREATE TABLE maxsuper2 (
ms2_id INTEGER PRIMARY KEY
...
);

CREATE TABLE sub2a (
name VARCHAR(50);
...
) UNDER maxsuper2;

=====================================
Tree 3 is visible to Tree 1 and Tree 2 via INHERIT
Tree 1 (maxsuper1) and Tree 2 (maxsuper2) can see
their own trees, AND Tree 3.
=====================================
CREATE TABLE maxsuper3 (
-- inherited composite PRIMARY KEY (ms1_id, ms2_id)
-- I think this might be the right thing to do, though this example is
not the best. Consider a TABLE row and a TABLE
col. TABLE cell could INHERIT (row,col). The
inherited primary key (row_id, col_id) determines a cell.
This is also rather simple. It forces people who are going to
use multiple inheritance to really think about how the
PRIMARY KEYs are chosen and when a composite
doesn't make sense, then they should probably not
be inherited together anyway.
...
) INHERITS (maxsuper1, maxsuper2); -- optional parens.

CREATE TABLE sub3a (
name VARCHAR(50);
...
) UNDER maxsuper3;

========================================================
Example SELECTs
========================================================
SELECT * FROM maxsuper1;
Returns all rows, including into UNDER tree sub1a ...
This form will select though all UNDER related subtables.

SELECT * FROM maxsuper1*;
Returns all rows, including into UNDER tree sub1a and into child tree
maxsuper3 etc. If any subtables are parents of children in an INHERITS
relationship, then the select also continues through those INHERITS also,
descending into childs UNDER subtables and INHERIT children if any.
This form will select through all UNDER related subtables AND all INHERITED
related children.

SELECT * FROM ONLY maxsuper1;
Returns only rows in maxsuper1, does NOT go into UNDER tree nor INHERIT
related tree maxsuper3 ... maxsuper1 itself ONLY is selected.
This form will select from ONLY the specified table - INHERIT and UNDER related
children and subtables are ignored.

SELECT * FROM ONLY maxsuper1*;
Returns only rows in maxsuper1 and INHERIT children, but does not get rows
from any UNDER trees of maxsuper1 or its children.
This form will select through all INHERIT related children of the specified
table - all UNDER related tables are ignored.

=============================
Some Rules
=============================
1.
UNDER and INHERIT can be used in the same CREATE TABLE, but with the following
restrictions:

a.
If C is UNDER A and INHERITS (B,...), then no table of (B,...) is UNDER A.

b.
If C is UNDER B and INHERITS (A,...), then B INHERITS from no table of (A,...).

Both of these conditions prevent a situation where C tries to obtain the
same attributes two different ways. In other words, A and B must not be
related by INHERIT or UNDER.

Yes, I'm saying that the following syntax is possible:
CREATE TABLE subtable1b2 (
...
) UNDER maxsuper1 INHERITS(maxsuper2)
The inherited PRIMARY KEYs form a composite primary key.

2.
If a column is added to a parent_table or supertable, the column add must
cascade to the child_table(s) and subtable(s). If the column add does not
cascade, then SELECT * FROM parent* and SELECT * FROM supertable, will not
work right. When adding a column to a supertable, any subtable that is a parent
table to children via INHERIT, has to cascade the new column to its children,
which may also in turn cascade the column add further.

3.
A supertable cannot be deleted until all its subtables are deleted first, or
some syntax is used to cascade the delete (as suggested by Hannu Krosing).

4.
A parent table in an INHERIT relationship may be deleted without consequence to
its children.

5.
In the case of clashing same-name attributes in multiple inheritance from
UNDER combined with INHERIT or just INHERIT, the CREATE TABLE fails until
use of ALTER TABLE RENAME COLUMN corrects the problem. Attribute rename will
have to cascade through child and subtables.

==================================================

Well, enough for now. I hope somebody sees where I'm going here. In previous
messages I've said that it should not be allowed to inherit from a subtable.
My rules above now allow for that. The combination of UNDER and INHERIT allows
for quite a bit of flexibility if enough rules and details are sorted out.

Comments?

--
Robert B. Easter
reaster@comptechnews.com

#8Chris Bitmead
chris@bitmead.com
In reply to: Chris Bitmead (#1)
Re: SQL3 UNDER

Well, you've laid out a whole lot of rules here. I understand what those
rules are, but I don't see the logical purpose for having such a set of
rules.

It appears you've got two separate inheritance mechanisms that interact
in strange ways. Which inheritance scheme that gets activated depends on
whether you use tablename or tablename*. Why not invent a few more
inheritance mechanisms, then you can have tablename% and tablename&,
then there can be some more rules for how they interact? I don't
understand why you want to have these kinds of semantics. Does it have
precedent in some programming language?

"Robert B. Easter" wrote:

Show quoted text

On Tue, 23 May 2000, Chris Bitmead wrote:



I'll try to provide examples later. For now, did you see the gif
attachments on a earlier message of mine?

I didn't before, but I do now.

The UNDER and CLONES/INHERITS gif pictures
provide a graphical view of what I mean. UNDER creates tree hierarchy
down vertically, while INHERITS supports multiple inheritance in a
lateral direction. The UNDER trees can be under any table that is part
of an INHERITS relationship. UNDER and INHERITS work at different
levels sorta. A subtable in an UNDER hierarchy can't be in an INHERITS > clause because it is logically just part of its maximal supertable. In
other words, INHERITS can provide a relationship between different
whole trees created by UNDER, by way of a maximal supertable being
inherited by another maximal supertable with its own
UNDER tree. Make any sense? :-)

I'm afraid not. Show me the (SQL) code :-).

=======
Tree 1
=======
CREATE TABLE maxsuper1 (
ms1_id INTEGER PRIMARY KEY,
...
);

CREATE TABLE sub1a (
name VARCHAR(50);
) UNDER maxsuper1; -- maxsuper1.ms1_id is PRIMARY KEY

=======
Tree 2
=======
CREATE TABLE maxsuper2 (
ms2_id INTEGER PRIMARY KEY
...
);

CREATE TABLE sub2a (
name VARCHAR(50);
...
) UNDER maxsuper2;

=====================================
Tree 3 is visible to Tree 1 and Tree 2 via INHERIT
Tree 1 (maxsuper1) and Tree 2 (maxsuper2) can see
their own trees, AND Tree 3.
=====================================
CREATE TABLE maxsuper3 (
-- inherited composite PRIMARY KEY (ms1_id, ms2_id)
-- I think this might be the right thing to do, though this example is
not the best. Consider a TABLE row and a TABLE
col. TABLE cell could INHERIT (row,col). The
inherited primary key (row_id, col_id) determines a cell.
This is also rather simple. It forces people who are going to
use multiple inheritance to really think about how the
PRIMARY KEYs are chosen and when a composite
doesn't make sense, then they should probably not
be inherited together anyway.
...
) INHERITS (maxsuper1, maxsuper2); -- optional parens.

CREATE TABLE sub3a (
name VARCHAR(50);
...
) UNDER maxsuper3;

========================================================
Example SELECTs
========================================================
SELECT * FROM maxsuper1;
Returns all rows, including into UNDER tree sub1a ...
This form will select though all UNDER related subtables.

SELECT * FROM maxsuper1*;
Returns all rows, including into UNDER tree sub1a and into child tree
maxsuper3 etc. If any subtables are parents of children in an INHERITS
relationship, then the select also continues through those INHERITS also,
descending into childs UNDER subtables and INHERIT children if any.
This form will select through all UNDER related subtables AND all INHERITED
related children.

SELECT * FROM ONLY maxsuper1;
Returns only rows in maxsuper1, does NOT go into UNDER tree nor INHERIT
related tree maxsuper3 ... maxsuper1 itself ONLY is selected.
This form will select from ONLY the specified table - INHERIT and UNDER related
children and subtables are ignored.

SELECT * FROM ONLY maxsuper1*;
Returns only rows in maxsuper1 and INHERIT children, but does not get rows
from any UNDER trees of maxsuper1 or its children.
This form will select through all INHERIT related children of the specified
table - all UNDER related tables are ignored.

=============================
Some Rules
=============================
1.
UNDER and INHERIT can be used in the same CREATE TABLE, but with the following
restrictions:

a.
If C is UNDER A and INHERITS (B,...), then no table of (B,...) is UNDER A.

b.
If C is UNDER B and INHERITS (A,...), then B INHERITS from no table of (A,...).

Both of these conditions prevent a situation where C tries to obtain the
same attributes two different ways. In other words, A and B must not be
related by INHERIT or UNDER.

Yes, I'm saying that the following syntax is possible:
CREATE TABLE subtable1b2 (
...
) UNDER maxsuper1 INHERITS(maxsuper2)
The inherited PRIMARY KEYs form a composite primary key.

2.
If a column is added to a parent_table or supertable, the column add must
cascade to the child_table(s) and subtable(s). If the column add does not
cascade, then SELECT * FROM parent* and SELECT * FROM supertable, will not
work right. When adding a column to a supertable, any subtable that is a parent
table to children via INHERIT, has to cascade the new column to its children,
which may also in turn cascade the column add further.

3.
A supertable cannot be deleted until all its subtables are deleted first, or
some syntax is used to cascade the delete (as suggested by Hannu Krosing).

4.
A parent table in an INHERIT relationship may be deleted without consequence to
its children.

5.
In the case of clashing same-name attributes in multiple inheritance from
UNDER combined with INHERIT or just INHERIT, the CREATE TABLE fails until
use of ALTER TABLE RENAME COLUMN corrects the problem. Attribute rename will
have to cascade through child and subtables.

==================================================

Well, enough for now. I hope somebody sees where I'm going here. In previous
messages I've said that it should not be allowed to inherit from a subtable.
My rules above now allow for that. The combination of UNDER and INHERIT allows
for quite a bit of flexibility if enough rules and details are sorted out.

Comments?

--
Robert B. Easter
reaster@comptechnews.com

#9Chris Bitmead
chris@bitmead.com
In reply to: Chris Bitmead (#1)
Re: SQL3 UNDER

Maybe it would help if you have two examples. One that only uses UNDER,
and one that only uses INHERITS, and explain how one or the other can
work differently.

"Robert B. Easter" wrote:

Show quoted text

On Tue, 23 May 2000, Chris Bitmead wrote:



I'll try to provide examples later. For now, did you see the gif
attachments on a earlier message of mine?

I didn't before, but I do now.

The UNDER and CLONES/INHERITS gif pictures
provide a graphical view of what I mean. UNDER creates tree hierarchy
down vertically, while INHERITS supports multiple inheritance in a
lateral direction. The UNDER trees can be under any table that is part
of an INHERITS relationship. UNDER and INHERITS work at different
levels sorta. A subtable in an UNDER hierarchy can't be in an INHERITS > clause because it is logically just part of its maximal supertable. In
other words, INHERITS can provide a relationship between different
whole trees created by UNDER, by way of a maximal supertable being
inherited by another maximal supertable with its own
UNDER tree. Make any sense? :-)

I'm afraid not. Show me the (SQL) code :-).

=======
Tree 1
=======
CREATE TABLE maxsuper1 (
ms1_id INTEGER PRIMARY KEY,
...
);

CREATE TABLE sub1a (
name VARCHAR(50);
) UNDER maxsuper1; -- maxsuper1.ms1_id is PRIMARY KEY

=======
Tree 2
=======
CREATE TABLE maxsuper2 (
ms2_id INTEGER PRIMARY KEY
...
);

CREATE TABLE sub2a (
name VARCHAR(50);
...
) UNDER maxsuper2;

=====================================
Tree 3 is visible to Tree 1 and Tree 2 via INHERIT
Tree 1 (maxsuper1) and Tree 2 (maxsuper2) can see
their own trees, AND Tree 3.
=====================================
CREATE TABLE maxsuper3 (
-- inherited composite PRIMARY KEY (ms1_id, ms2_id)
-- I think this might be the right thing to do, though this example is
not the best. Consider a TABLE row and a TABLE
col. TABLE cell could INHERIT (row,col). The
inherited primary key (row_id, col_id) determines a cell.
This is also rather simple. It forces people who are going to
use multiple inheritance to really think about how the
PRIMARY KEYs are chosen and when a composite
doesn't make sense, then they should probably not
be inherited together anyway.
...
) INHERITS (maxsuper1, maxsuper2); -- optional parens.

CREATE TABLE sub3a (
name VARCHAR(50);
...
) UNDER maxsuper3;

========================================================
Example SELECTs
========================================================
SELECT * FROM maxsuper1;
Returns all rows, including into UNDER tree sub1a ...
This form will select though all UNDER related subtables.

SELECT * FROM maxsuper1*;
Returns all rows, including into UNDER tree sub1a and into child tree
maxsuper3 etc. If any subtables are parents of children in an INHERITS
relationship, then the select also continues through those INHERITS also,
descending into childs UNDER subtables and INHERIT children if any.
This form will select through all UNDER related subtables AND all INHERITED
related children.

SELECT * FROM ONLY maxsuper1;
Returns only rows in maxsuper1, does NOT go into UNDER tree nor INHERIT
related tree maxsuper3 ... maxsuper1 itself ONLY is selected.
This form will select from ONLY the specified table - INHERIT and UNDER related
children and subtables are ignored.

SELECT * FROM ONLY maxsuper1*;
Returns only rows in maxsuper1 and INHERIT children, but does not get rows
from any UNDER trees of maxsuper1 or its children.
This form will select through all INHERIT related children of the specified
table - all UNDER related tables are ignored.

=============================
Some Rules
=============================
1.
UNDER and INHERIT can be used in the same CREATE TABLE, but with the following
restrictions:

a.
If C is UNDER A and INHERITS (B,...), then no table of (B,...) is UNDER A.

b.
If C is UNDER B and INHERITS (A,...), then B INHERITS from no table of (A,...).

Both of these conditions prevent a situation where C tries to obtain the
same attributes two different ways. In other words, A and B must not be
related by INHERIT or UNDER.

Yes, I'm saying that the following syntax is possible:
CREATE TABLE subtable1b2 (
...
) UNDER maxsuper1 INHERITS(maxsuper2)
The inherited PRIMARY KEYs form a composite primary key.

2.
If a column is added to a parent_table or supertable, the column add must
cascade to the child_table(s) and subtable(s). If the column add does not
cascade, then SELECT * FROM parent* and SELECT * FROM supertable, will not
work right. When adding a column to a supertable, any subtable that is a parent
table to children via INHERIT, has to cascade the new column to its children,
which may also in turn cascade the column add further.

3.
A supertable cannot be deleted until all its subtables are deleted first, or
some syntax is used to cascade the delete (as suggested by Hannu Krosing).

4.
A parent table in an INHERIT relationship may be deleted without consequence to
its children.

5.
In the case of clashing same-name attributes in multiple inheritance from
UNDER combined with INHERIT or just INHERIT, the CREATE TABLE fails until
use of ALTER TABLE RENAME COLUMN corrects the problem. Attribute rename will
have to cascade through child and subtables.

==================================================

Well, enough for now. I hope somebody sees where I'm going here. In previous
messages I've said that it should not be allowed to inherit from a subtable.
My rules above now allow for that. The combination of UNDER and INHERIT allows
for quite a bit of flexibility if enough rules and details are sorted out.

Comments?

--
Robert B. Easter
reaster@comptechnews.com

#10Robert B. Easter
reaster@comptechnews.com
In reply to: Chris Bitmead (#8)
Re: SQL3 UNDER

On Tue, 23 May 2000, Chris Bitmead wrote:

Well, you've laid out a whole lot of rules here. I understand what those
rules are, but I don't see the logical purpose for having such a set of
rules.

It appears you've got two separate inheritance mechanisms that interact
in strange ways. Which inheritance scheme that gets activated depends on
whether you use tablename or tablename*. Why not invent a few more
inheritance mechanisms, then you can have tablename% and tablename&,
then there can be some more rules for how they interact? I don't
understand why you want to have these kinds of semantics. Does it have
precedent in some programming language?

A database is capable of more flexibility than a programming language with
regard to how it can store objects. A database it not constrained by
hardcoded runtime and compilation dependencies like objects in a programming
language. Changing the data structure of a program means reprogramming then
restarting the program. If made right, a database can evolve its classes
without ever going offline. I think there are some differences and so I don't
see programming language precedents being so relevent.

I'm just proposing things to see if we don't over look some possibilities.
Under my ideas here, UNDER can be implemented more like to spec (maybe
exactly). INHERIT can pickup the Postgres extensions until a standard
covers it too.

#11Robert B. Easter
reaster@comptechnews.com
In reply to: Chris Bitmead (#9)
Re: SQL3 UNDER

On Tue, 23 May 2000, Chris Bitmead wrote:

Maybe it would help if you have two examples. One that only uses UNDER,
and one that only uses INHERITS, and explain how one or the other can
work differently.

Which one (or both) that you use depends on the relationship the two entities
have. If you need multiple inheritance, your choice is clear: INHERITS. UNDER
will not do multiple inheritance.
UNDER is the choice when the idea is of EXTENDing a class into more
specific types of subclasses. INHERIT is the choice when the idea is like
parent and child or olddesign and newdesign where olddesign may disappear
without any problem.

What follows are some rough examples. There could be some errors. I'd like to
see someone elses examples too. I know there are possibilities for very good
examples.

CREATE TABLE powersource (
);
CREATE TABLE nuclearpowersource (
) UNDER powersource;
CREATE fissionpowersource (
) UNDER nuclearpowersource;
CREATE fusionpowersource (
) UNDER nuclearpowersource;

CREATE TABLE machine (
);
CREATE TABLE poweredmachine (
) INHERITS(powersource) UNDER machine ;

CREATE TABLE wheel (
);
CREATE TABLE tire (
) UNDER wheel;
CREATE TABLE knobbedtire (
) UNDER tire;
CREATE TABLE smoothtire (
) UNDER tire;

CREATE TABLE transportmode (
);
CREATE TABLE wheeltransport (
) INHERITS(tire) UNDER transportmode
CREATE TABLE foottransport (
) UNDER transportmode;

CREATE TABLE engine (
) INHERITS(poweredmachine);
CREATE TABLE jetengine (
) UNDER engine;
CREATE TABLE PISTONENGINE (
) UNDER engine;
CREATE TABLE electricengine (
) UNDER engine;

CREATE TABLE lifeform (
species INTEGER PRIMARY KEY,
brain INTEGER
);
CREATE TABLE human (
) UNDER lifeform;

CREATE TABLE autotransportmachine (
) INHERITS (transportmode) UNDER poweredmachine

CREATE TABLE cyborg (
) INHERITS(autotransportmachine) UNDER human;

CREATE TABLE entity (
) INHERITS (cyborg);

============================================

"Robert B. Easter" wrote:

On Tue, 23 May 2000, Chris Bitmead wrote:



I'll try to provide examples later. For now, did you see the gif
attachments on a earlier message of mine?

I didn't before, but I do now.

The UNDER and CLONES/INHERITS gif pictures
provide a graphical view of what I mean. UNDER creates tree hierarchy
down vertically, while INHERITS supports multiple inheritance in a
lateral direction. The UNDER trees can be under any table that is part
of an INHERITS relationship. UNDER and INHERITS work at different
levels sorta. A subtable in an UNDER hierarchy can't be in an INHERITS > clause because it is logically just part of its maximal supertable. In
other words, INHERITS can provide a relationship between different
whole trees created by UNDER, by way of a maximal supertable being
inherited by another maximal supertable with its own
UNDER tree. Make any sense? :-)

I'm afraid not. Show me the (SQL) code :-).

=======
Tree 1
=======
CREATE TABLE maxsuper1 (
ms1_id INTEGER PRIMARY KEY,
...
);

CREATE TABLE sub1a (
name VARCHAR(50);
) UNDER maxsuper1; -- maxsuper1.ms1_id is PRIMARY KEY

=======
Tree 2
=======
CREATE TABLE maxsuper2 (
ms2_id INTEGER PRIMARY KEY
...
);

CREATE TABLE sub2a (
name VARCHAR(50);
...
) UNDER maxsuper2;

=====================================
Tree 3 is visible to Tree 1 and Tree 2 via INHERIT
Tree 1 (maxsuper1) and Tree 2 (maxsuper2) can see
their own trees, AND Tree 3.
=====================================
CREATE TABLE maxsuper3 (
-- inherited composite PRIMARY KEY (ms1_id, ms2_id)
-- I think this might be the right thing to do, though this example is
not the best. Consider a TABLE row and a TABLE
col. TABLE cell could INHERIT (row,col). The
inherited primary key (row_id, col_id) determines a cell.
This is also rather simple. It forces people who are going to
use multiple inheritance to really think about how the
PRIMARY KEYs are chosen and when a composite
doesn't make sense, then they should probably not
be inherited together anyway.
...
) INHERITS (maxsuper1, maxsuper2); -- optional parens.

CREATE TABLE sub3a (
name VARCHAR(50);
...
) UNDER maxsuper3;

========================================================
Example SELECTs
========================================================
SELECT * FROM maxsuper1;
Returns all rows, including into UNDER tree sub1a ...
This form will select though all UNDER related subtables.

SELECT * FROM maxsuper1*;
Returns all rows, including into UNDER tree sub1a and into child tree
maxsuper3 etc. If any subtables are parents of children in an INHERITS
relationship, then the select also continues through those INHERITS also,
descending into childs UNDER subtables and INHERIT children if any.
This form will select through all UNDER related subtables AND all INHERITED
related children.

SELECT * FROM ONLY maxsuper1;
Returns only rows in maxsuper1, does NOT go into UNDER tree nor INHERIT
related tree maxsuper3 ... maxsuper1 itself ONLY is selected.
This form will select from ONLY the specified table - INHERIT and UNDER related
children and subtables are ignored.

SELECT * FROM ONLY maxsuper1*;
Returns only rows in maxsuper1 and INHERIT children, but does not get rows
from any UNDER trees of maxsuper1 or its children.
This form will select through all INHERIT related children of the specified
table - all UNDER related tables are ignored.

=============================
Some Rules
=============================
1.
UNDER and INHERIT can be used in the same CREATE TABLE, but with the following
restrictions:

a.
If C is UNDER A and INHERITS (B,...), then no table of (B,...) is UNDER A.

b.
If C is UNDER B and INHERITS (A,...), then B INHERITS from no table of (A,...).

Both of these conditions prevent a situation where C tries to obtain the
same attributes two different ways. In other words, A and B must not be
related by INHERIT or UNDER.

Yes, I'm saying that the following syntax is possible:
CREATE TABLE subtable1b2 (
...
) UNDER maxsuper1 INHERITS(maxsuper2)
The inherited PRIMARY KEYs form a composite primary key.

2.
If a column is added to a parent_table or supertable, the column add must
cascade to the child_table(s) and subtable(s). If the column add does not
cascade, then SELECT * FROM parent* and SELECT * FROM supertable, will not
work right. When adding a column to a supertable, any subtable that is a parent
table to children via INHERIT, has to cascade the new column to its children,
which may also in turn cascade the column add further.

3.
A supertable cannot be deleted until all its subtables are deleted first, or
some syntax is used to cascade the delete (as suggested by Hannu Krosing).

4.
A parent table in an INHERIT relationship may be deleted without consequence to
its children.

5.
In the case of clashing same-name attributes in multiple inheritance from
UNDER combined with INHERIT or just INHERIT, the CREATE TABLE fails until
use of ALTER TABLE RENAME COLUMN corrects the problem. Attribute rename will
have to cascade through child and subtables.

==================================================

Well, enough for now. I hope somebody sees where I'm going here. In previous
messages I've said that it should not be allowed to inherit from a subtable.
My rules above now allow for that. The combination of UNDER and INHERIT allows
for quite a bit of flexibility if enough rules and details are sorted out.

Comments?

--
Robert B. Easter
reaster@comptechnews.com

--
Robert B. Easter
reaster@comptechnews.com

#12Chris Bitmead
chris@bitmead.com
In reply to: Chris Bitmead (#1)
Re: SQL3 UNDER

"Robert B. Easter" wrote:

A database is capable of more flexibility than a programming language
with regard to how it can store objects. A database it not constrained
by hardcoded runtime and compilation dependencies like objects in a
programming language. Changing the data structure of a program means
reprogramming then restarting the program.

Well, my favoured language is lisp which can actually change its
structures, even its code and polymorphic rules at runtime.

If made right, a database can evolve its classes without ever going
offline. I think there are some differences and so I don't
see programming language precedents being so relevent.

Ok, programming languages aren't a precedent. Is there another database
as precedent? Give me something to work with here.

I'm just proposing things to see if we don't over look some
possibilities. Under my ideas here, UNDER can be implemented more like
to spec (maybe exactly). INHERIT can pickup the Postgres extensions
until a standard covers it too.

It sounds to me you're worried about the implementation rather than the
spec. IF someone were to bother implementing that layout it should
probably just be an option - not affecting semantics. CREATE TABLE
foo(...) UNDER bar LAYOUT IS HIERARCHIAL or LAYOUT IS SINGULAR. That
would complicate the code a lot though. Personally I think if it was
implemented the way the spec implies it would create an extra join for
every inheritance declaration. Avoiding that is the whole reason to have
an object database. If you don't care about another join for every
inheritance you may as well use a pure relational database with a mapper
library like persistance because you're not gaining a whole lot. On the
other hand with the current implementation (which is pretty much how
every ODBMS and ORBMS I've ever seen works), there is very little
downside. If you implement a single index that indexes subclasses then
both index scans and sequential scans will be pretty near optimal with
no joins. Compare against who knows how many joins if you split it up.
The only minor downside is you maybe lift a little more data off the
disk IF you happen to be doing a projection of super-class attributes.
But an ODMG interface would hardly ever do that anyway.

#13Hannu Krosing
hannu@tm.ee
In reply to: Chris Bitmead (#1)
Re: SQL3 UNDER

"Robert B. Easter" wrote:

On Tue, 23 May 2000, Chris Bitmead wrote:

Maybe it would help if you have two examples. One that only uses UNDER,
and one that only uses INHERITS, and explain how one or the other can
work differently.

Which one (or both) that you use depends on the relationship the two entities
have. If you need multiple inheritance, your choice is clear: INHERITS. UNDER
will not do multiple inheritance.
UNDER is the choice when the idea is of EXTENDing a class into more
specific types of subclasses. INHERIT is the choice when the idea is like
parent and child or olddesign and newdesign where olddesign may disappear
without any problem.

What follows are some rough examples. There could be some errors. I'd like to
see someone elses examples too. I know there are possibilities for very good
examples.

CREATE TABLE powersource (
);
CREATE TABLE nuclearpowersource (
) UNDER powersource;
CREATE fissionpowersource (
) UNDER nuclearpowersource;
CREATE fusionpowersource (
) UNDER nuclearpowersource;

This is what INHERITS currently is meant for.

CREATE TABLE machine (
);
CREATE TABLE poweredmachine (
) INHERITS(powersource) UNDER machine ;

Why not just

CREATE TABLE poweredmachine (
machine_powersource powersource
) UNDER machine ;

This should probably allow to insert any powersource as machine_powersource.

-------
Hannu

#14Chris Bitmead
chrisb@nimrod.itg.telstra.com.au
In reply to: Chris Bitmead (#1)
Re: SQL3 UNDER

"Robert B. Easter" wrote:

On Tue, 23 May 2000, Chris Bitmead wrote:

Maybe it would help if you have two examples. One that only uses UNDER,
and one that only uses INHERITS, and explain how one or the other can
work differently.

Yes but how does a pure UNDER example actually work different to a pure
INHERITS example? You've created various tables below (combining INHERIT
and UNDER unfortunately), but how will the INHERITS hierarchies and
UNDER hierarchies actually work differently in practice?

Show quoted text

Which one (or both) that you use depends on the relationship the two entities
have. If you need multiple inheritance, your choice is clear: INHERITS. UNDER
will not do multiple inheritance.
UNDER is the choice when the idea is of EXTENDing a class into more
specific types of subclasses. INHERIT is the choice when the idea is like
parent and child or olddesign and newdesign where olddesign may disappear
without any problem.

What follows are some rough examples. There could be some errors. I'd like to
see someone elses examples too. I know there are possibilities for very good
examples.

CREATE TABLE powersource (
);
CREATE TABLE nuclearpowersource (
) UNDER powersource;
CREATE fissionpowersource (
) UNDER nuclearpowersource;
CREATE fusionpowersource (
) UNDER nuclearpowersource;

CREATE TABLE machine (
);
CREATE TABLE poweredmachine (
) INHERITS(powersource) UNDER machine ;

CREATE TABLE wheel (
);
CREATE TABLE tire (
) UNDER wheel;
CREATE TABLE knobbedtire (
) UNDER tire;
CREATE TABLE smoothtire (
) UNDER tire;

CREATE TABLE transportmode (
);
CREATE TABLE wheeltransport (
) INHERITS(tire) UNDER transportmode
CREATE TABLE foottransport (
) UNDER transportmode;

CREATE TABLE engine (
) INHERITS(poweredmachine);
CREATE TABLE jetengine (
) UNDER engine;
CREATE TABLE PISTONENGINE (
) UNDER engine;
CREATE TABLE electricengine (
) UNDER engine;

CREATE TABLE lifeform (
species INTEGER PRIMARY KEY,
brain INTEGER
);
CREATE TABLE human (
) UNDER lifeform;

CREATE TABLE autotransportmachine (
) INHERITS (transportmode) UNDER poweredmachine

CREATE TABLE cyborg (
) INHERITS(autotransportmachine) UNDER human;

CREATE TABLE entity (
) INHERITS (cyborg);

============================================

"Robert B. Easter" wrote:

On Tue, 23 May 2000, Chris Bitmead wrote:



I'll try to provide examples later. For now, did you see the gif
attachments on a earlier message of mine?

I didn't before, but I do now.

The UNDER and CLONES/INHERITS gif pictures
provide a graphical view of what I mean. UNDER creates tree hierarchy
down vertically, while INHERITS supports multiple inheritance in a
lateral direction. The UNDER trees can be under any table that is part
of an INHERITS relationship. UNDER and INHERITS work at different
levels sorta. A subtable in an UNDER hierarchy can't be in an INHERITS > clause because it is logically just part of its maximal supertable. In
other words, INHERITS can provide a relationship between different
whole trees created by UNDER, by way of a maximal supertable being
inherited by another maximal supertable with its own
UNDER tree. Make any sense? :-)

I'm afraid not. Show me the (SQL) code :-).

=======
Tree 1
=======
CREATE TABLE maxsuper1 (
ms1_id INTEGER PRIMARY KEY,
...
);

CREATE TABLE sub1a (
name VARCHAR(50);
) UNDER maxsuper1; -- maxsuper1.ms1_id is PRIMARY KEY

=======
Tree 2
=======
CREATE TABLE maxsuper2 (
ms2_id INTEGER PRIMARY KEY
...
);

CREATE TABLE sub2a (
name VARCHAR(50);
...
) UNDER maxsuper2;

=====================================
Tree 3 is visible to Tree 1 and Tree 2 via INHERIT
Tree 1 (maxsuper1) and Tree 2 (maxsuper2) can see
their own trees, AND Tree 3.
=====================================
CREATE TABLE maxsuper3 (
-- inherited composite PRIMARY KEY (ms1_id, ms2_id)
-- I think this might be the right thing to do, though this example is
not the best. Consider a TABLE row and a TABLE
col. TABLE cell could INHERIT (row,col). The
inherited primary key (row_id, col_id) determines a cell.
This is also rather simple. It forces people who are going to
use multiple inheritance to really think about how the
PRIMARY KEYs are chosen and when a composite
doesn't make sense, then they should probably not
be inherited together anyway.
...
) INHERITS (maxsuper1, maxsuper2); -- optional parens.

CREATE TABLE sub3a (
name VARCHAR(50);
...
) UNDER maxsuper3;

========================================================
Example SELECTs
========================================================
SELECT * FROM maxsuper1;
Returns all rows, including into UNDER tree sub1a ...
This form will select though all UNDER related subtables.

SELECT * FROM maxsuper1*;
Returns all rows, including into UNDER tree sub1a and into child tree
maxsuper3 etc. If any subtables are parents of children in an INHERITS
relationship, then the select also continues through those INHERITS also,
descending into childs UNDER subtables and INHERIT children if any.
This form will select through all UNDER related subtables AND all INHERITED
related children.

SELECT * FROM ONLY maxsuper1;
Returns only rows in maxsuper1, does NOT go into UNDER tree nor INHERIT
related tree maxsuper3 ... maxsuper1 itself ONLY is selected.
This form will select from ONLY the specified table - INHERIT and UNDER related
children and subtables are ignored.

SELECT * FROM ONLY maxsuper1*;
Returns only rows in maxsuper1 and INHERIT children, but does not get rows
from any UNDER trees of maxsuper1 or its children.
This form will select through all INHERIT related children of the specified
table - all UNDER related tables are ignored.

=============================
Some Rules
=============================
1.
UNDER and INHERIT can be used in the same CREATE TABLE, but with the following
restrictions:

a.
If C is UNDER A and INHERITS (B,...), then no table of (B,...) is UNDER A.

b.
If C is UNDER B and INHERITS (A,...), then B INHERITS from no table of (A,...).

Both of these conditions prevent a situation where C tries to obtain the
same attributes two different ways. In other words, A and B must not be
related by INHERIT or UNDER.

Yes, I'm saying that the following syntax is possible:
CREATE TABLE subtable1b2 (
...
) UNDER maxsuper1 INHERITS(maxsuper2)
The inherited PRIMARY KEYs form a composite primary key.

2.
If a column is added to a parent_table or supertable, the column add must
cascade to the child_table(s) and subtable(s). If the column add does not
cascade, then SELECT * FROM parent* and SELECT * FROM supertable, will not
work right. When adding a column to a supertable, any subtable that is a parent
table to children via INHERIT, has to cascade the new column to its children,
which may also in turn cascade the column add further.

3.
A supertable cannot be deleted until all its subtables are deleted first, or
some syntax is used to cascade the delete (as suggested by Hannu Krosing).

4.
A parent table in an INHERIT relationship may be deleted without consequence to
its children.

5.
In the case of clashing same-name attributes in multiple inheritance from
UNDER combined with INHERIT or just INHERIT, the CREATE TABLE fails until
use of ALTER TABLE RENAME COLUMN corrects the problem. Attribute rename will
have to cascade through child and subtables.

==================================================

Well, enough for now. I hope somebody sees where I'm going here. In previous
messages I've said that it should not be allowed to inherit from a subtable.
My rules above now allow for that. The combination of UNDER and INHERIT allows
for quite a bit of flexibility if enough rules and details are sorted out.

Comments?

--
Robert B. Easter
reaster@comptechnews.com

--
Robert B. Easter
reaster@comptechnews.com

#15Chris Bitmead
chrisb@nimrod.itg.telstra.com.au
In reply to: Chris Bitmead (#14)
Re: SQL3 UNDER

Peter Eisentraut wrote:

On Tue, 23 May 2000, Chris Bitmead wrote:

As far as I'm concerned, current postgres INHERIT, is exactly the same
semantics as UNDER (apart from multiple inheritance).

Agreed, but note that according to the final SQL99 standard the UNDER
clause comes before the originally defined column list, which does make
sense because that's how the columns end up.

Are you sure? It actually looks to me like you can have the UNDER before
or after. What sense do you make of that? (Note the <table element
list> occuring before and after the <subtable clause>.

<table definition> ::=
CREATE [ <table scope> ] TABLE <table name>
<table contents source>
[ ON COMMIT <table commit action> ROWS ]

<table contents source> ::=
<table element list>
| OF <user-defined type>
[ <subtable clause> ]
[ <table element list> ]
<subtable clause> ::=
UNDER <supertable clause>

#16Stephan Szabo
sszabo@kick.com
In reply to: Chris Bitmead (#15)
Re: SQL3 UNDER

Chris Bitmead wrote:

Peter Eisentraut wrote:
Agreed, but note that according to the final SQL99 standard the UNDER
clause comes before the originally defined column list, which does make
sense because that's how the columns end up.

Are you sure? It actually looks to me like you can have the UNDER before
or after. What sense do you make of that? (Note the <table element
list> occuring before and after the <subtable clause>.
<table definition> ::=
CREATE [ <table scope> ] TABLE <table name>
<table contents source>
[ ON COMMIT <table commit action> ROWS ]

<table contents source> ::=
<table element list>
| OF <user-defined type>
[ <subtable clause> ]
[ <table element list> ]
<subtable clause> ::=
UNDER <supertable clause>

Actually, from this I'd say Peter was right unless I'm horribly misreading
the
grammar piece provided, <table element list> doesn't come both before and
after <subtable clause> in the <table contents source>, it is either alone,
or part of the OF...<table element list> with the | breaking the two
options.

#17Chris Bitmead
chrisb@nimrod.itg.telstra.com.au
In reply to: Chris Bitmead (#15)
Re: SQL3 UNDER

You're right. I'll have to look at making changes.

Stephan Szabo wrote:

Show quoted text

Chris Bitmead wrote:

Peter Eisentraut wrote:
Agreed, but note that according to the final SQL99 standard the UNDER
clause comes before the originally defined column list, which does make
sense because that's how the columns end up.

Are you sure? It actually looks to me like you can have the UNDER before
or after. What sense do you make of that? (Note the <table element
list> occuring before and after the <subtable clause>.
<table definition> ::=
CREATE [ <table scope> ] TABLE <table name>
<table contents source>
[ ON COMMIT <table commit action> ROWS ]

<table contents source> ::=
<table element list>
| OF <user-defined type>
[ <subtable clause> ]
[ <table element list> ]
<subtable clause> ::=
UNDER <supertable clause>

Actually, from this I'd say Peter was right unless I'm horribly misreading
the
grammar piece provided, <table element list> doesn't come both before and
after <subtable clause> in the <table contents source>, it is either alone,
or part of the OF...<table element list> with the | breaking the two
options.

#18Robert B. Easter
reaster@comptechnews.com
In reply to: Chris Bitmead (#17)
1 attachment(s)
Fwd: Re: SQL3 UNDER

---------- Forwarded Message ----------
Subject: Re: [HACKERS] SQL3 UNDER
Date: Tue, 23 May 2000 21:53:24 -0400
From: Robert B. Easter <reaster@comptechnews.com>

On Tue, 23 May 2000, Chris Bitmead wrote:

"Robert B. Easter" wrote:

On Tue, 23 May 2000, Chris Bitmead wrote:

Maybe it would help if you have two examples. One that only uses UNDER,
and one that only uses INHERITS, and explain how one or the other can
work differently.

Yes but how does a pure UNDER example actually work different to a pure
INHERITS example? You've created various tables below (combining INHERIT
and UNDER unfortunately), but how will the INHERITS hierarchies and
UNDER hierarchies actually work differently in practice?

I guess I've said most of what I can say about this idea. Attached is another
GIF picture of the ideas, I suppose. If I come up with a good example, I'll
post it.

I'm willing to admit my idea could be very flawed! I'm hoping others in here
will find it worthy enough to try to find those flaws and examples on their own.

I've started posting this OO stuff to pgsql-hackers-oo@postgresql.org. I'll
try to not post anymore oo stuff in pgsql-hackers (if there is even anything
else say about this).

Good luck,
Robert B. Easter

-------------------------------------------------------

--
Robert B. Easter
reaster@comptechnews.com

Attachments:

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#19Hannu Krosing
hannu@tm.ee
In reply to: Robert B. Easter (#18)
Re: Fwd: Re: SQL3 UNDER

"Robert B. Easter" wrote:

I've started posting this OO stuff to pgsql-hackers-oo@postgresql.org.

Where can I subscribe to that list ?

I must have missed or lost the announcement possibly when I lost 3 days worth
of mail sunday night ;(

I'll try to not post anymore oo stuff in pgsql-hackers (if there is even
anything else say about this).

The OO-PostgreSQL discussion is not even near being over ...

-------------
Hannu

#20Robert B. Easter
reaster@comptechnews.com
In reply to: Hannu Krosing (#19)
Re: Fwd: Re: SQL3 UNDER

On Wed, 24 May 2000, Hannu Krosing wrote:

"Robert B. Easter" wrote:

I've started posting this OO stuff to pgsql-hackers-oo@postgresql.org.

Where can I subscribe to that list ?

Just send a message to pgsql-hackers-oo-request@postgresql.org
with subject "subscribe"

The OO-PostgreSQL discussion is not even near being over ...

Well, I hope some one sees my point about INHERITS and UNDER
maybe being complementary. UNDER is a single inheritance container/tree all
contained inside maximal supertable. INHERITS provides multiple inheritance
and can provide links between tables in different containers/trees, subject to
some restrictions. I think it deserves some looking at rather than just doing
away with INHERIT for just UNDER. (again I can be wrong). I guess its hard to
explain. I still need to provide good examples. I can best describe the
difference as UNDER creates circles within circles representing tables and
subtables. INHERITS provides for circles/tables to overlap (to be cloned in a
sense) and allows it multiple overlapping/merging. The INHERITS does it as it
is now that way, by merging same name attributes from two or more parents into a
single child. INHERIT is like cells reproducing using one or n parents.
UNDER is like a single cell making baby cells inside of itself. :-) hehe

#21Chris Bitmead
chrisb@nimrod.itg.telstra.com.au
In reply to: Robert B. Easter (#18)
Re: Fwd: Re: SQL3 UNDER

"Robert B. Easter" wrote:

Well, I hope some one sees my point about INHERITS and UNDER
maybe being complementary. UNDER is a single inheritance container/tree all
contained inside maximal supertable. INHERITS provides multiple inheritance
and can provide links between tables in different containers/trees, subject to
some restrictions. I think it deserves some looking at rather than just doing
away with INHERIT for just UNDER. (again I can be wrong). I guess its hard to
explain. I still need to provide good examples. I can best describe the
difference as UNDER creates circles within circles representing tables and
subtables. INHERITS provides for circles/tables to overlap (to be cloned in a
sense) and allows it multiple overlapping/merging. The INHERITS does it as it
is now that way, by merging same name attributes from two or more parents into a
single child. INHERIT is like cells reproducing using one or n parents.
UNDER is like a single cell making baby cells inside of itself. :-) hehe

Would you still be having these thoughts if you were looking at the
older SQL3 draft that included multiple inheritance UNDER? The newer
UNDER appears to be a subset, which I presume they adopted to get the
proposal out the door quicker. Personally I'd like to implement the
SQL3-1994 extensions as well, because they actually seemed well thought
out (I'm thinking particularly of the rename stuff).

#22Robert B. Easter
reaster@comptechnews.com
In reply to: Chris Bitmead (#21)
Re: Fwd: Re: SQL3 UNDER

On Wed, 24 May 2000, Chris Bitmead wrote:

"Robert B. Easter" wrote:

Well, I hope some one sees my point about INHERITS and UNDER
maybe being complementary. UNDER is a single inheritance container/tree all
contained inside maximal supertable. INHERITS provides multiple inheritance
and can provide links between tables in different containers/trees, subject to
some restrictions. I think it deserves some looking at rather than just doing
away with INHERIT for just UNDER. (again I can be wrong). I guess its hard to
explain. I still need to provide good examples. I can best describe the
difference as UNDER creates circles within circles representing tables and
subtables. INHERITS provides for circles/tables to overlap (to be cloned in a
sense) and allows it multiple overlapping/merging. The INHERITS does it as it
is now that way, by merging same name attributes from two or more parents into a
single child. INHERIT is like cells reproducing using one or n parents.
UNDER is like a single cell making baby cells inside of itself. :-) hehe

Would you still be having these thoughts if you were looking at the
older SQL3 draft that included multiple inheritance UNDER? The newer
UNDER appears to be a subset, which I presume they adopted to get the
proposal out the door quicker. Personally I'd like to implement the
SQL3-1994 extensions as well, because they actually seemed well thought
out (I'm thinking particularly of the rename stuff).

There are documents at

ftp://jerry.ece.umassd.edu/isowg3/dbl/BASEdocs/sql4hold/

that maybe we should look at. It *might* represent what is planned for SQL4.
It shows UNDER accepting multiple supertables like the 1994 draft. However,
these documents are dated 1996 and probably don't really represent SQL4, which
might take many years still until its a standard. By the time SQL4 comes out,
there's no telling what it will look like.

I'm thinking, it might be best just to implement UNDER as it stands in the
official standard for now. Leave INHERIT the way it is (for the most part) and
implement UNDER separately. Continue to use inherit if you need multiple
inheritance. If you implement multiple inherit UNDER, it will create a user
base that will depend on that functionality. Later, it will be difficult to
change that functionality if the official standard for UNDER does switch to
multiple inheritance but in a way that is incompatible with yours. Its not a
good idea to second guess the future standard. People already use INHERIT the
way it is and it can be used in combination with UNDER.

--
Robert B. Easter
reaster@comptechnews.com

#23Hannu Krosing
hannu@tm.ee
In reply to: Robert B. Easter (#22)
Re: AW: SQL3 UNDER

Zeugswetter Andreas SB wrote:

For multiple
inheritance, why not just suggest the use of INHERITS, which is
already a Postgres language extension for multiple
inheritance. UNDER covers
the tree/hierarchy situation, so make it only to SQL3 standards.
INHERIT fits the clone/copy/inherits situation that, like I've
said before, is like starting a new tree.

Imho the difference is so marginal, that I would not like to see two
different implementations. Informix e.g. took what Illustra had
for inherits and only changed the keyword to under, which is imho
what we should do.

Agreed.

When calling functions with a class argument they do pass all attributes
of subclasses to it. They use late function binding, so you can define
different functions for different subclasses having the same name.
They only show parent columns when doing 'select * from class' that has
subclasses.

That's what we are planning also, to return all columns current
favourite syntax to use is 'select ** from class', but even it is not
yet implemented.

BTW, does Informix/Illustra do single or multiple inheritance with their
UNDER?

-------
Hannu

#24Zeugswetter Andreas SB
ZeugswetterA@wien.spardat.at
In reply to: Hannu Krosing (#23)
AW: SQL3 UNDER

For multiple
inheritance, why not just suggest the use of INHERITS, which is
already a Postgres language extension for multiple
inheritance. UNDER covers
the tree/hierarchy situation, so make it only to SQL3 standards.
INHERIT fits the clone/copy/inherits situation that, like I've
said before, is like starting a new tree.

Imho the difference is so marginal, that I would not like to see two
different implementations. Informix e.g. took what Illustra had
for inherits and only changed the keyword to under, which is imho
what we should do.

When calling functions with a class argument they do pass all attributes
of subclasses to it. They use late function binding, so you can define
different functions for different subclasses having the same name.
They only show parent columns when doing 'select * from class' that has
subclasses.

Andreas

#25Hannu Krosing
hannu@tm.ee
In reply to: Zeugswetter Andreas SB (#24)
Re: AW: AW: SQL3 UNDER

Zeugswetter Andreas SB wrote:

When calling functions with a class argument they do pass

all attributes

of subclasses to it. They use late function binding, so you

can define

different functions for different subclasses having the same name.
They only show parent columns when doing 'select * from

class' that has

subclasses.

That's what we are planning also, to return all columns current
favourite syntax to use is 'select ** from class', but even it is not
yet implemented.

I am not talking about select * I am talking about
"select somefunc(supertable) from supertable"

create table supertable (a int);
create table taba (b int) under supertable;

create function somefunc (tup supertable) returning int
as 'select 1' ...

create function somefunc (tup taba) returning int
as 'select 0.5*b' ....

So how does this work in Informix/Illustra ?

i.e. is the binding done at row evaluation time or
"when they do 'select * ...' and don't know about coumn b"

BTW, does Informix/Illustra do single or multiple inheritance
with their
UNDER?

Multiple,

That's what I thought ;)

as I said they took Illustra (which was a parallel effort
to port Postgres to SQL).

That much I know (we almost bought an Illustra db before Postgres95
was even available;)

----------
Hannu

#26Zeugswetter Andreas SB
ZeugswetterA@wien.spardat.at
In reply to: Hannu Krosing (#25)
AW: AW: SQL3 UNDER

When calling functions with a class argument they do pass

all attributes

of subclasses to it. They use late function binding, so you

can define

different functions for different subclasses having the same name.
They only show parent columns when doing 'select * from

class' that has

subclasses.

That's what we are planning also, to return all columns current
favourite syntax to use is 'select ** from class', but even it is not
yet implemented.

I am not talking about select * I am talking about
"select somefunc(supertable) from supertable"

create table supertable (a int);
create table taba (b int) under supertable;

create function somefunc (tup supertable) returning int
as 'select 1' ...

create function somefunc (tup taba) returning int
as 'select 0.5*b' ....

BTW, does Informix/Illustra do single or multiple inheritance
with their
UNDER?

Multiple, as I said they took Illustra (which was a parallel effort
to port Postgres to SQL).

Andreas

#27Zeugswetter Andreas SB
ZeugswetterA@wien.spardat.at
In reply to: Zeugswetter Andreas SB (#26)
AW: AW: AW: SQL3 UNDER

I am not talking about select * I am talking about
"select somefunc(supertable) from supertable"

create table supertable (a int);
create table taba (b int) under supertable;

create function somefunc (tup supertable) returning int
as 'select 1' ...

create function somefunc (tup taba) returning int
as 'select 0.5*b' ....

So how does this work in Informix/Illustra ?

i.e. is the binding done at row evaluation time or
"when they do 'select * ...' and don't know about coumn b"

when you do "select * from supertable" you only get column a,
but rows from both tables.
when you do select somefunc(supertable) ... the function
corresponding to the rowtype is called thus the taba rows
do get 0.5*b as result.

Andreas