Yes, adding a MutableJoin sounds good.

If I recall correctly, there are two approaches to recognizing materialized 
views (SubstitutionVisitor and lattice). You are in SubstitutionVisitor, which 
I believe will struggle with complexity when trying to match an N-way join 
query to an M-way join view. If you can make progress, great, but for star-join 
kinds of queries I recommend using lattices.

Julian

> On Jun 1, 2015, at 12:16 AM, Rajat Venkatesh <[email protected]> wrote:
> 
> I am trying to setup a couple of Lattices in calcite. Both of them have
> joins and have a few common tables between them.
> 
> After the first lattice is setup, calcite tries to use it in the second
> lattice since there are common tables. It fails because it cannot convert a
> LogicalJoin to a MutableRel.
> 
> Is this a gap in implementation ? Can I add a MutableJoin using the same
> pattern as the other operators ?
> 
> Repro and stack trace below.
> On a side note, JUnit does not print the exception message but prints the
> stack trace. Does anyone else see that ? I do not have the same problem
> with other Java projects.
> 
> 
> Repro:
> https://github.com/vrajat/incubator-calcite/commit/76eb6a642bffc1b5326431b90986df37d7399c6c
> 
> 
> Stack Trace:
> 
> Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 38.789 sec
> <<< FAILURE! - in org.apache.calcite.test.LatticeTest
> testTwoLattices(org.apache.calcite.test.LatticeTest)  Time elapsed: 38.789
> sec  <<< ERROR!
> java.lang.RuntimeException: exception while preparing [select
> s."unit_sales", p."brand_name"
> from "foodmart"."sales_fact_1997" as s
> join "foodmart"."product" as p using ("product_id")
> ]
> at
> org.apache.calcite.plan.SubstitutionVisitor.toMutable(SubstitutionVisitor.java:231)
> at
> org.apache.calcite.plan.SubstitutionVisitor.toMutable(SubstitutionVisitor.java:215)
> at
> org.apache.calcite.plan.SubstitutionVisitor.toMutable(SubstitutionVisitor.java:226)
> at
> org.apache.calcite.plan.SubstitutionVisitor.<init>(SubstitutionVisitor.java:179)
> at
> org.apache.calcite.plan.volcano.VolcanoPlanner.substitute(VolcanoPlanner.java:411)
> at
> org.apache.calcite.plan.volcano.VolcanoPlanner.useMaterialization(VolcanoPlanner.java:369)
> at
> org.apache.calcite.plan.volcano.VolcanoPlanner.useApplicableMaterializations(VolcanoPlanner.java:455)
> at
> org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp(VolcanoPlanner.java:736)
> at org.apache.calcite.tools.Programs$5.run(Programs.java:272)
> at org.apache.calcite.tools.Programs$SequenceProgram.run(Programs.java:320)
> at org.apache.calcite.prepare.Prepare.optimize(Prepare.java:142)
> at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:280)
> at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:188)
> at
> org.apache.calcite.prepare.CalcitePrepareImpl.prepare2_(CalcitePrepareImpl.java:534)
> at
> org.apache.calcite.prepare.CalcitePrepareImpl.prepare_(CalcitePrepareImpl.java:435)
> at
> org.apache.calcite.prepare.CalcitePrepareImpl.prepareSql(CalcitePrepareImpl.java:404)
> at org.apache.calcite.schema.Schemas.prepare(Schemas.java:326)
> at
> org.apache.calcite.materialize.MaterializationService.defineMaterialization(MaterializationService.java:118)
> at
> org.apache.calcite.materialize.MaterializationService.defineTile(MaterializationService.java:290)
> at
> org.apache.calcite.jdbc.CalciteConnectionImpl.init(CalciteConnectionImpl.java:140)
> at org.apache.calcite.jdbc.Driver$1.onConnectionInit(Driver.java:102)
> at
> org.apache.calcite.avatica.UnregisteredDriver.connect(UnregisteredDriver.java:145)
> at java.sql.DriverManager.getConnection(DriverManager.java:571)
> at java.sql.DriverManager.getConnection(DriverManager.java:187)
> at
> org.apache.calcite.test.CalciteAssert$MapConnectionFactory.createConnection(CalciteAssert.java:1099)
> at
> org.apache.calcite.test.CalciteAssert$AssertQuery.createConnection(CalciteAssert.java:1139)
> at
> org.apache.calcite.test.CalciteAssert$AssertQuery.substitutionMatches(CalciteAssert.java:1232)
> at org.apache.calcite.test.LatticeTest.testTwoLattices(LatticeTest.java:594)
> 
> -- 
> Rajat Venkatesh | Engg Lead
> Qubole Inc | www.qubole.com

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