We currently only have the selectivity of the index, histograms on value distributions are planned for some point in the future.
So I think it mostly multiplies the total number by the selectivity, but I'm not the expert there. Perhaps Petra can point you to the right place in the code? Cheers, Michael On Wed, Jul 19, 2017 at 9:53 PM, Sun Yuhan <[email protected]> wrote: > If such a query is given " match (n:PEOPLE) where 40 > n.age > 30 return > n", how does the query optimizer estimate the number of rows returned by > the query? I know for relational database, they have histogram information > about distribution of values for each attribute. But for a graph database, > how does this estimation is made? > > Or a point to the corresponding page of source code is really helpful. Thx! > > -- > You received this message because you are subscribed to the Google Groups > "Neo4j" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Neo4j" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
