Output from both queries, demonstrating full cluster scans: https://gist.github.com/rustyrazorblade/c4947fc37da85bca50e08aa1ef3c7a06 <https://gist.github.com/rustyrazorblade/c4947fc37da85bca50e08aa1ef3c7a06>
Jon > On May 9, 2017, at 9:24 AM, Jon Haddad <jonathan.had...@gmail.com> wrote: > > Nope, I didn’t comment on that query. I specifically answered your question > about "select * from hello where a='foo' allow filtering;” > > The query you’ve listed here looks like it would also do a full table scan > (again, I don’t see how it would be avoided). > > I recommend firing up a 3 node cluster using CCM, creating a key space with > RF=1, and seeing what it does. > >> On May 9, 2017, at 9:12 AM, Kant Kodali <k...@peernova.com >> <mailto:k...@peernova.com>> wrote: >> >> Hi, >> >> Are you saying The following query select max(b) from hello where a='a1' >> allow filtering; doesn't result in a table scan? I got the result for this >> query and yes I just tried tracing it and looks like it is indeed doing a >> table scan on ReadStage-2 although I am not sure if I am interpreting it >> right? Finally is there anyway to prevent table scan while providing the >> partial partition key and get the max b ? >> >> <Screen Shot 2017-05-09 at 7.07.46 AM.png> >> >> >> >> On Tue, May 9, 2017 at 6:33 AM, Jon Haddad <jonathan.had...@gmail.com >> <mailto:jonathan.had...@gmail.com>> wrote: >> I don’t see any way it wouldn’t. Have you tried tracing it? >> >> > On May 9, 2017, at 8:32 AM, Kant Kodali <k...@peernova.com >> > <mailto:k...@peernova.com>> wrote: >> > >> > Hi All, >> > >> > It looks like Cassandra 3.10 has partial partition key search but does it >> > result in a table scan? for example I can have the following >> > >> > create table hello( >> > a text, >> > b int, >> > c text, >> > d text, >> > primary key((a,b), c) >> > ); >> > >> > Now I can do select * from hello where a='foo' allow filtering;// This >> > works in 3.10 but I wonder if this query results in table scan and if so >> > is there any way to limit such that I get max b? >> > >> > Thanks! >> >> >
