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https://issues.apache.org/jira/browse/CALCITE-6555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Julian Hyde reassigned CALCITE-6555:
------------------------------------
Assignee: Julian Hyde
> RelBuilder.aggregateRex thinks aggregate functions of "GROUP BY ()" queries
> are NOT NULL
> ----------------------------------------------------------------------------------------
>
> Key: CALCITE-6555
> URL: https://issues.apache.org/jira/browse/CALCITE-6555
> Project: Calcite
> Issue Type: Improvement
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
>
> In {{RelBuilder}}, the {{aggregateRex}} method (added in CALCITE-5802) thinks
> that aggregate functions in a {{GROUP BY ()}} queries are NOT NULL. Consider
> the query
> {code}
> SELECT SUM(empno) AS s, COUNT(empno) AS c
> FROM emp
> GROUP BY ()
> {code}
> {{SUM(empno)}} is nullable, even though {{empno}} has type {{SMALLINT NOT
> NULL}}, because {{GROUP BY ()}} will return one row even if {{emp}} has no
> rows, and therefore {{SUM}} will be evaluated over the empty set. A test
> ({{RelBuilderTest.testAggregateRex4}}) that attempts to build an equivalent
> query gets the following error stack:
> {noformat}
> java.lang.AssertionError: type mismatch:
> ref:
> SMALLINT NOT NULL
> input:
> SMALLINT
> at org.apache.calcite.util.Litmus.lambda$static$0(Litmus.java:31)
> at org.apache.calcite.plan.RelOptUtil.eq(RelOptUtil.java:2217)
> at org.apache.calcite.rex.RexChecker.visitInputRef(RexChecker.java:130)
> at org.apache.calcite.rex.RexChecker.visitInputRef(RexChecker.java:62)
> at org.apache.calcite.rex.RexInputRef.accept(RexInputRef.java:125)
> at org.apache.calcite.rel.core.Project.isValid(Project.java:262)
> at org.apache.calcite.rel.core.Project.<init>(Project.java:107)
> at
> org.apache.calcite.rel.logical.LogicalProject.<init>(LogicalProject.java:75)
> at
> org.apache.calcite.rel.logical.LogicalProject.create(LogicalProject.java:168)
> at
> org.apache.calcite.rel.logical.LogicalProject.create(LogicalProject.java:144)
> at
> org.apache.calcite.rel.core.RelFactories$ProjectFactoryImpl.createProject(RelFactories.java:208)
> at org.apache.calcite.tools.RelBuilder.project_(RelBuilder.java:2135)
> at org.apache.calcite.tools.RelBuilder.project(RelBuilder.java:1910)
> at org.apache.calcite.tools.RelBuilder.project(RelBuilder.java:1893)
> at org.apache.calcite.tools.RelBuilder.project(RelBuilder.java:1865)
> at org.apache.calcite.tools.RelBuilder.project(RelBuilder.java:1854)
> at
> org.apache.calcite.tools.RelBuilder.aggregateRex(RelBuilder.java:2639)
> at
> org.apache.calcite.tools.RelBuilder.aggregateRex(RelBuilder.java:2626)
> at
> org.apache.calcite.test.RelBuilderTest.lambda$testAggregateRex4$96(RelBuilderTest.java:3409)
> at
> org.apache.calcite.test.RelBuilderTest.testAggregateRex4(RelBuilderTest.java:3419)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:566)
> at
> org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:727)
> at
> org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
> at
> org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
> at
> org.junit.jupiter.engine.extension.SameThreadTimeoutInvocation.proceed(SameThreadTimeoutInvocation.java:45)
> at
> org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:156)
> at
> org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:147)
> at
> org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:86)
> at
> org.junit.jupiter.engine.execution.InterceptingExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(InterceptingExecutableInvoker.java:103)
> at
> org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.lambda$invoke$0(InterceptingExecutableInvoker.java:93)
> at
> org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
> at
> org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
> at
> org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
> at
> org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
> at
> org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:92)
> at
> org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:86)
> at
> org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:217)
> at
> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
> at
> org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:213)
> at
> org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:138)
> at
> org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:68)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:151)
> at
> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
> at
> org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
> at
> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
> at
> org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService$ExclusiveTask.compute(ForkJoinPoolHierarchicalTestExecutorService.java:185)
> at
> org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService.invokeAll(ForkJoinPoolHierarchicalTestExecutorService.java:129)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
> at
> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
> at
> org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
> at
> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
> at
> org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService$ExclusiveTask.compute(ForkJoinPoolHierarchicalTestExecutorService.java:185)
> at
> org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService.invokeAll(ForkJoinPoolHierarchicalTestExecutorService.java:129)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
> at
> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
> at
> org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
> at
> org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
> at
> org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
> at
> org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService$ExclusiveTask.compute(ForkJoinPoolHierarchicalTestExecutorService.java:185)
> {noformat}
> This problem is showing up in measures queries (e.g. CALCITE-6525), because
> that is the only code path that uses {{aggregateRex}} currently.
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