[jira] [Created] (CALCITE-2228) An inevitable NPE while using MAX aggregation function

["Muhammad Gelbana (JIRA)" <ji...@apache.org>]

Muhammad Gelbana created CALCITE-2228:
-----------------------------------------

             Summary: An inevitable NPE while using MAX aggregation function
                 Key: CALCITE-2228
                 URL: https://issues.apache.org/jira/browse/CALCITE-2228
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.16.0, next
            Reporter: Muhammad Gelbana
            Assignee: Julian Hyde


Looking at this [line|https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/interpreter/AggregateNode.java#L150], and the referenced [instance variable|https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/adapter/enumerable/AggImpState.java#L33], it looks to me that

{code:java}
int stateSize = agg.state.size{code}
will always throw a *NPE* because the *agg.state* object reference is never initialized before it's being used !


I'm facing the following exception
{noformat}
java.sql.SQLException: Error while executing SQL "SELECT MAX(COUNTRY_ID), MAX(COUNTRY_TOTAL_ID) FROM SALES.COUNTRIES": null
    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 com.mg.sqlinterface.data.provider.calcite.internal.Test_SQLi.testMG(Test_SQLi.java:35)
    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$2.evaluate(ParentRunner.java:268)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.NullPointerException
    at org.apache.calcite.interpreter.AggregateNode.getAccumulator(AggregateNode.java:150)
    at org.apache.calcite.interpreter.AggregateNode.<init>(AggregateNode.java:86)
    at org.apache.calcite.interpreter.Nodes$CoreCompiler.visit(Nodes.java:47)
    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.apache.calcite.util.ReflectUtil.invokeVisitorInternal(ReflectUtil.java:257)
    at org.apache.calcite.util.ReflectUtil.invokeVisitor(ReflectUtil.java:214)
    at org.apache.calcite.util.ReflectUtil$1.invokeVisitor(ReflectUtil.java:464)
    at org.apache.calcite.interpreter.Interpreter$Compiler.visit(Interpreter.java:480)
    at org.apache.calcite.interpreter.Interpreter$Compiler.visitRoot(Interpreter.java:437)
    at org.apache.calcite.interpreter.Interpreter.<init>(Interpreter.java:78)
    at Baz.bind(Unknown Source)
    at org.apache.calcite.jdbc.CalcitePrepare$CalciteSignature.enumerable(CalcitePrepare.java:365)
    at org.apache.calcite.jdbc.CalciteConnectionImpl.enumerable(CalciteConnectionImpl.java:301)
    at org.apache.calcite.jdbc.CalciteMetaImpl._createIterable(CalciteMetaImpl.java:559)
    at org.apache.calcite.jdbc.CalciteMetaImpl.createIterable(CalciteMetaImpl.java:550)
    at org.apache.calcite.avatica.AvaticaResultSet.execute(AvaticaResultSet.java:204)
    at org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:67)
    at org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:44)
    at org.apache.calcite.avatica.AvaticaConnection$1.execute(AvaticaConnection.java:630)
    at org.apache.calcite.jdbc.CalciteMetaImpl.prepareAndExecute(CalciteMetaImpl.java:619)
    at org.apache.calcite.avatica.AvaticaConnection.prepareAndExecuteInternal(AvaticaConnection.java:638)
    at org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:149)
    ... 27 more{noformat}



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