On Wed, 2004-07-07 at 02:04, Justin Clift wrote:
Simon Riggs wrote:
External tool is one thing, but the loadable personality seems like a
very good idea and worth discussing further.
Would an interesting, and maybe slightly different way of viewing a
"loadable personality," be as a set of "rules" that can be applied to
parser input before the parser actually gets it... and massages input
SQL into something for the parser to understand.

I'm hugely generalising here of course, but you know how we have a
PostgreSQL "Rules" system that rewrites queries before handing them to
the query planner... well, would it be possible/practical to potentially
have a "Rules" system that rewrites incoming SQL before it gets given to
the normal parser.

Might get complicated though... we'd need a pre-parser or something.

However, having a generalised system for doing this may make it far
easier to provide "personalities". i.e. load a set of Oracle 8i rules,
load a set of Oracle 9i rules, load a set of DB2 x, rules, etc.

...Something to return to later, when this release is done.

Best regards, Simon

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