Comment 6 for bug 1233113

Interestingly it looks like int oqgraph::random(bool scan) gets called in spite of our readonliness
and also rnd_next even though we dont do a query!

So it seems that

update graph set x=y;

will actually run a query before it works out we are read-only...

also for some reason two calls to fetch_row which increment the cursor ref count twice...