Awesome! I particularly like the fact that there is a Rex translator from FunctionExpressions! The QueryableRelBuilder class has lots of UnsupportedOperationExceptions though. Lots of opportunity :)
Thanks, Walaa. On Wed, Mar 14, 2018 at 4:09 PM, Julian Hyde <jh...@apache.org> wrote: > QueryableRelBuilder can handle translating simple Linq4j expressions > to RelNodes. E.g. QueryableRelBuilder.where creates a LogicalFilter. > > In theory you ought to be able to invoke it via > CalciteConnectionImpl.executeQuery(Queryable). I thought there were > tests, but I can't find any. > > > On Wed, Mar 14, 2018 at 3:10 PM, Michael Mior <mm...@uwaterloo.ca> wrote: > > Others may correct me, but I don't believe this is currently supported. > We > > may not be able to support all of Linq4j, but I'd imagine a usable subset > > would be possible. If you're interested in implementing, that would be > > great! Either way, I'd suggest you file a JIRA case for this. Thanks! > > > > -- > > Michael Mior > > mm...@apache.org > > > > 2018-03-14 2:27 GMT-04:00 Walaa Eldin Moustafa <wa.moust...@gmail.com>: > > > >> Does Calcite currently support converting a Linq4j expression to > relational > >> algebra? After a quick look at the code, it seems that it does not, so > if > >> not, do you think it is feasible? On one hand, the Linq4j expressions > are > >> very similar to the RelBuilder structure, (e.g., .groupBy(), .orderBy(), > >> etc). On the other hand, the extensive use of functions (e.g., > selectors) > >> and in-memory data-types may be difficult to implement as a RelBuilder. > The > >> use case I have in mind is to have Linq4j as another top-level interface > >> (that is interpretable to relational algebra) to Calcite in addition to > SQL > >> and Piglet. > >> > >> Thanks, > >> Walaa. > >> >
