Re: [HACKERS] Re: EXCEPT/INTERSECT for v6.4

From: Clark Evans <clark(dot)evans(at)manhattanproject(dot)com>
To: "Thomas G(dot) Lockhart" <lockhart(at)alumni(dot)caltech(dot)edu>
Cc: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>, Stefan Simkovics <ssimkovi(at)ag(dot)or(dot)at>, PostgreSQL-development <hackers(at)postgreSQL(dot)org>
Subject: Re: [HACKERS] Re: EXCEPT/INTERSECT for v6.4
Date: 1999-01-13 06:04:15
Message-ID: 369C375F.32F2F324@manhattanproject.com
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Thomas,

The documentation Stefan wrote for his Master's thesis
is great stuff. Perhaps some of could be incorporated?

Stefan Simkovics wrote:
> > I also included the text of my Master's Thesis. (a postscript
> > version). I hope that you find something of it useful and would be
> > happy if parts of it find their way into the PostgreSQL documentation
> > project (If so, tell me, then I send the sources of the document!)

I took the liberty of making a PDF file and posting it on my server:

http://www.manhattanproject.com/stefan_simkovics_masters_thesis.pdf

If this is a problem, I'll remove it. Also, once the paper has
a permanent home, I'll put in a re-director for it.

> > The contents of the document are:
> > -) The first chapter might be of less interest as it gives only an
> > overview on SQL.
> >
> > -) The second chapter gives a description on much of PostgreSQL's
> > features (like user defined types etc. and how to use these features)

This second chapter is a great introduction. (***)

> > -) The third chapter starts with an overview of PostgreSQL's internal
> > structure with focus on the stages a query has to pass (i.e. parser,
> > planner/optimizer, executor). Then a detailed description of the
> > implementation of the Having clause and the Intersect/Except logic is
> > given.

And this third chapter is wonderful, it gives a very good low level
description of the rewrite process and internal query representation
in a graphic format. (****)

Best,

Clark Evans

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