Things that could be done to DBMS -- 12 October 1998

Query optimizer:

	Optimize for clustering indexes (use S/T and G/H plans)

		e.g. assume Auto-increment column => clustering

		or measure the clustering in the stats

	Optimize for multi-column lookup

		e.g. For "a=v1 and b=v2" with index on (a,b)

	Optimize for like-predicates

		e.g. "x LIKE 'abc*'" => "x>='abc' AND x<'abd'" etc.

	Query complexity-reduction by removing redundant predicates, e.g.

		"x>4 AND x>3" => "x>4"

		"x>4 OR x>3" => "x>3"

		"x>-1" for unsigned x => trivially true

	Better statistical data dn guesswork

SQL/access plans:

	Support "DISTINCT" in the projection stage via a Hash-system or sorting