Hi Shubham, Regarding point 1) you can easily get around it by defining a few of your own classes in a package with the same name as Prepare although I doubt is the right approach.
Perhaps MaterializationTest [1] can help you get a few more ideas on how to use the respective service. Other than that if you want to see how to instantiate CatalogReader, Validator, etc., maybe the code sample in [2] can help. Best, Stamatis [1] https://github.com/apache/calcite/blob/master/core/src/test/java/org/apache/calcite/test/MaterializationTest.java [2] https://github.com/zabetak/calcite/blob/livecodingdemo/core/src/test/java/org/apache/calcite/examples/foodmart/java/EndToEndExampleEnumerable.java On Fri, Oct 4, 2019 at 12:22 PM Shubham Kumar <shubhamkumar1...@gmail.com> wrote: > Hi contributors, > > I am trying to retrieve materialized view query rewrite from Calcite. > > In order to do that, I have created a planner and wanted to get the > optimized relNode after applying Materializations which is equivalent to > applying [1] present in Prepare class of Calcite. However, I am facing > difficulties while trying to do so. I have so far tried: > > 1) Doing exactly what's being done in [1] but it turned out some members of > <Prepare.Materializations> can't be accessed outside package, so I am > unable to obtain RelOptMaterialization from it. > > 2) I figured I only need (tableRel, queryRel) relNodes for making a > RelOptMaterialization which can be made from Materialization.sql but when I > try to so with the a planner instance (i.e. planner.rel(validatedNode).rel) > : I am getting errors: > > i) When using the different planner instance: > Relational expression LogicalFilter#24 belongs to a different planner than > is currently being used. > ii) When using the same planner instance: > java.lang.IllegalArgumentException: cannot move to STATE_2_READY from > STATE_5_CONVERTED > > I figured out that maybe SqlToRelConverter could help out in this use case > but I don't know how to get instances of CatalogReader, Validator, > ViewExpander and SqlRexConvertletTable. > > Can someone point out where I am going wrong and what's the correct way to > go about it. > > [1] > > https://github.com/apache/calcite/blob/73023148e7f37d494f6caf92b01b090f6dde13cd/core/src/main/java/org/apache/calcite/prepare/Prepare.java#L320 > -- > Thanks & Regards > > Shubham Kumar >
