Roland Bouman wrote:
Hi Jim, all
On Wed, Feb 11, 2009 at 6:38 PM, Jim Starkey <[email protected]> wrote:
Many database systems use a type hierarchy of "record source blocks" or the
like. Each member of type hierarchy has an open, fetch, and close method.
The basic types are these:
* Exhaustive retrieval
* Index retrieval
* Boolean filter
* Sort
* Looping join
* Sort merge join
* Hash join
* Group by
The basic idea is that the compiler generates a tree of record source blocks
assembled like legos. Each type is simple since it only has one thing to
do. The intelligence comes from the way they are assembled.
This sounds interesting...it reminds me of how commands are piped on a
unix command line. Is that an appropriate metaphor?
Simile? Analogy? Metaphor? Whatever.
Yes.
(apologies in case this is an extremely stupid comparison)
kind regards and TIA,
--
Jim Starkey
President, NimbusDB, Inc.
978 526-1376
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