A few weeks ago I was dealing a bit of attention to the charts in DataCleaner. Of special interest are the value distribution charts which has caused some discussions...
Anyways, here's a proposal which includes nicer (IMO) coloring, a "distinct count measure", a dedicated "<blank>" keyword and a few other niceties.
|Value distribution chart proposals|
You can expect to see this live in DataCleaner 2.3 which is expected in august.