At the risk of asking a stupid question, we already have optimizer
statistics on expression indexes.  In what sense are we using this for
multi-variate statistics, and in what sense can't we.

FYI, I just wrote a blog post about expression index statistics:

  Bruce Momjian  <>

+ As you are, so once was I.  As I am, so you will be. +
+                      Ancient Roman grave inscription +

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