[MONDRIAN-1934] updated isTooRagged decision to allow for more usecases,
also added trace info to sql logs for future debugging cases.
[MONDRIAN-1934] fixed logic mistake while cleaning up code for isTooRagged
Merge pull request #11 from tgf/evergreen

Evergreen - key lookup cache
[MONDRIAN-1934] added support for named sets used in count based
filters.
Merge branch 'evergreen' of https://github.com/wgorman/mondrian into evergreen
[MONDRIAN-1721] NonEmpty function