estimate_selectivity.h File Reference

Go to the source code of this file.

Functions
double	EstimateSelectivity (THD *thd, Item *condition, const CompanionSet &companion_set)
	For the given condition, to try estimate its filtering selectivity, on a 0..1 scale (where 1.0 lets all records through). More...

Function Documentation

EstimateSelectivity()

double EstimateSelectivity	(	THD *	thd,
		Item *	condition,
		const CompanionSet &	companion_set
	)

For the given condition, to try estimate its filtering selectivity, on a 0..1 scale (where 1.0 lets all records through).