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? (apologies in case this is an extremely stupid comparison) kind regards and TIA, -- Roland Bouman http://rpbouman.blogspot.com/ _______________________________________________ Mailing list: https://launchpad.net/~drizzle-discuss Post to : [email protected] Unsubscribe : https://launchpad.net/~drizzle-discuss More help : https://help.launchpad.net/ListHelp
