[ 
https://issues.apache.org/jira/browse/CALCITE-2184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Alessandro Solimando updated CALCITE-2184:
------------------------------------------
    Priority: Minor  (was: Major)

> subquery leading to a "java.lang.ClassCastException: RexSubQuery cannot be 
> cast to RexLocalRef"
> -----------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-2184
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2184
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.16.0
>            Reporter: Alessandro Solimando
>            Assignee: Julian Hyde
>            Priority: Minor
>
> Executing this query Calcite tries to cast the subquery (_RexSubQuery_) to a 
> local reference (_RexLocalRef_), resulting in a _ClassCastException_.
> Here is the query: 
> {code:sql}
> select *
> from (values (1, 'a'), (2, 'b'), (3, 'b'), (4, 'c'), (2, 'c')) as t(x, y)
> where exists (
>   select *
>   from (values (1, 'a'), (2, 'b')) as v(w, z)
>   where w < x
> )
> {code}
> But the same happens with other (similar) queries, such as the following:
> {code:sql}
> select x
> from (values (1, 'a'), (2, 'b')) as t(x, y)
> where x <= all (
>   select x
>   from (values (1, 'a'), (2, 'b'), (1, 'b'), (2, 'c'), (2, 'c')) as t(x, y)
> )
> {code}
> Please note that this problem is "masked" by the issues described in 
> [CALCITE-2183|https://issues.apache.org/jira/browse/CALCITE-2183], and it can 
> be reproduced only by "patching" this second.
> Below the complete stack trace:
> {noformat}
> java.lang.RuntimeException: With materializationsEnabled=false, limit=0
>       at 
> org.apache.calcite.test.CalciteAssert.assertQuery(CalciteAssert.java:600)
>       at 
> org.apache.calcite.test.CalciteAssert$AssertQuery.returns(CalciteAssert.java:1346)
>       at 
> org.apache.calcite.test.CalciteAssert$AssertQuery.returns(CalciteAssert.java:1329)
>       at 
> org.apache.calcite.test.CalciteAssert$AssertQuery.returnsUnordered(CalciteAssert.java:1357)
>       at 
> org.apache.calcite.test.SparkAdapterTest.commonTester(SparkAdapterTest.java:93)
>       at 
> org.apache.calcite.test.SparkAdapterTest.testFilterExists(SparkAdapterTest.java:720)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:498)
>       at 
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
>       at 
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
>       at 
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
>       at 
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
>       at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
>       at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
>       at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
>       at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
>       at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
>       at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
>       at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
>       at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
>       at 
> com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
>       at 
> com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
>       at 
> com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
>       at 
> com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
> Caused by: java.sql.SQLException: Error while executing SQL "select *
> from (values (1, 'a'), (2, 'b'), (3, 'b'), (4, 'c'), (2, 'c')) as t(x, y)
> where exists (
>   select *
>   from (values (1, 'a'), (2, 'b')) as v(w, z)
>   where w < x
> )": org.apache.calcite.rex.RexSubQuery cannot be cast to 
> org.apache.calcite.rex.RexLocalRef
>       at org.apache.calcite.avatica.Helper.createException(Helper.java:56)
>       at org.apache.calcite.avatica.Helper.createException(Helper.java:41)
>       at 
> org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:156)
>       at 
> org.apache.calcite.avatica.AvaticaStatement.executeQuery(AvaticaStatement.java:218)
>       at 
> org.apache.calcite.test.CalciteAssert.assertQuery(CalciteAssert.java:568)
>       ... 27 more
> Caused by: java.lang.ClassCastException: org.apache.calcite.rex.RexSubQuery 
> cannot be cast to org.apache.calcite.rex.RexLocalRef
>       at 
> org.apache.calcite.rex.RexProgramBuilder.registerInput(RexProgramBuilder.java:298)
>       at 
> org.apache.calcite.rex.RexProgramBuilder.addCondition(RexProgramBuilder.java:272)
>       at 
> org.apache.calcite.adapter.enumerable.EnumerableFilterToCalcRule.onMatch(EnumerableFilterToCalcRule.java:50)
>       at 
> org.apache.calcite.plan.AbstractRelOptPlanner.fireRule(AbstractRelOptPlanner.java:317)
>       at org.apache.calcite.plan.hep.HepPlanner.applyRule(HepPlanner.java:555)
>       at 
> org.apache.calcite.plan.hep.HepPlanner.applyRules(HepPlanner.java:415)
>       at 
> org.apache.calcite.plan.hep.HepPlanner.executeInstruction(HepPlanner.java:252)
>       at 
> org.apache.calcite.plan.hep.HepInstruction$RuleInstance.execute(HepInstruction.java:127)
>       at 
> org.apache.calcite.plan.hep.HepPlanner.executeProgram(HepPlanner.java:211)
>       at 
> org.apache.calcite.plan.hep.HepPlanner.findBestExp(HepPlanner.java:198)
>       at org.apache.calcite.tools.Programs$2.run(Programs.java:213)
>       at 
> org.apache.calcite.tools.Programs$SequenceProgram.run(Programs.java:387)
>       at org.apache.calcite.prepare.Prepare.optimize(Prepare.java:188)
>       at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:319)
>       at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:230)
>       at 
> org.apache.calcite.prepare.CalcitePrepareImpl.prepare2_(CalcitePrepareImpl.java:781)
>       at 
> org.apache.calcite.prepare.CalcitePrepareImpl.prepare_(CalcitePrepareImpl.java:640)
>       at 
> org.apache.calcite.prepare.CalcitePrepareImpl.prepareSql(CalcitePrepareImpl.java:610)
>       at 
> org.apache.calcite.jdbc.CalciteConnectionImpl.parseQuery(CalciteConnectionImpl.java:221)
>       at 
> org.apache.calcite.jdbc.CalciteMetaImpl.prepareAndExecute(CalciteMetaImpl.java:603)
>       at 
> org.apache.calcite.avatica.AvaticaConnection.prepareAndExecuteInternal(AvaticaConnection.java:638)
>       at 
> org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:149)
>       ... 29 more
> java.lang.RuntimeException: exception while executing [select *
> from (values (1, 'a'), (2, 'b'), (3, 'b'), (4, 'c'), (2, 'c')) as t(x, y)
> where exists (
>   select *
>   from (values (1, 'a'), (2, 'b')) as v(w, z)
>   where w < x
> )]
>       at 
> org.apache.calcite.test.CalciteAssert$AssertQuery.returns(CalciteAssert.java:1351)
>       at 
> org.apache.calcite.test.CalciteAssert$AssertQuery.returns(CalciteAssert.java:1329)
>       at 
> org.apache.calcite.test.CalciteAssert$AssertQuery.returnsUnordered(CalciteAssert.java:1357)
>       at 
> org.apache.calcite.test.SparkAdapterTest.commonTester(SparkAdapterTest.java:93)
>       at 
> org.apache.calcite.test.SparkAdapterTest.testFilterExists(SparkAdapterTest.java:720)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:498)
>       at 
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
>       at 
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
>       at 
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
>       at 
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
>       at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
>       at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
>       at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
>       at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
>       at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
>       at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
>       at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
>       at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
>       at 
> com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
>       at 
> com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
>       at 
> com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
>       at 
> com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
> {noformat}



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