**Major bug fix for @huanchenz**
The EE was not keeping track of IndexStats properly because we were using the catalog object's relativeIndex parameter.
Well, this parameter is not globally unique, so shit was getting overwritten. It was a real bummer.
So now we compute a composite id in the EE for each unique table+index pair. That ensures that we can get set things properly.

Ok, so I think I'm going to head back up to the Sex House for dinner with my ex-girlfriend. We're having lasagna.