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Julian Hyde commented on CALCITE-3300: -------------------------------------- Sorry I didn't reply. I am very busy. > Add a star identifier as operand to "SqlCountAggFunction" if no operands > given while in the method "createCall" > --------------------------------------------------------------------------------------------------------------- > > Key: CALCITE-3300 > URL: https://issues.apache.org/jira/browse/CALCITE-3300 > Project: Calcite > Issue Type: Bug > Components: core > Affects Versions: 1.21.0 > Reporter: Wang Weidong > Assignee: Wang Weidong > Priority: Major > Labels: pull-request-available > Time Spent: 10m > Remaining Estimate: 0h > > h4. Procedure to reproduce the problem: > - create table {{~^t^~}} > - parse query select count(*) from t to SqlNode > - convert SqlNode to RelNode > - convert RelNode to SqlNode > - validate the result SqlNode > test code is like this > {code:java} > // code placeholder > @Test > public void testSelectCountAll() throws Exception { > try (Statement s = parserContext.getStatement()) { > s.execute("create table if not exists t (i int not null)"); > String sql = "select count(*) from t"; > SqlNode sqlNode = parserContext.parseStmt(sql); > parserContext.getSqlValidator().validate(sqlNode); > RelNode relNode = > parserContext.getSqlToRelConverter().convertQuery(sqlNode, true, true).rel; > SqlNode sqlNodeNew = toSqlNode(relNode); > parserContext.getSqlValidator().validate(sqlNodeNew); > } > } > {code} > Finally we will get an exception as follow: > {code:java} > // code placeholder > org.apache.calcite.runtime.CalciteContextException: At line 0, column 0: > Invalid number of arguments to function 'COUNT'. Was expecting 1 > argumentsorg.apache.calcite.runtime.CalciteContextException: At line 0, > column 0: Invalid number of arguments to function 'COUNT'. Was expecting 1 > arguments at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native > Method) at > sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) > at > sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) > at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at > org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:463) > at org.apache.calcite.sql.SqlUtil.newContextException(SqlUtil.java:783) at > org.apache.calcite.sql.SqlUtil.newContextException(SqlUtil.java:768) at > org.apache.calcite.sql.validate.SqlValidatorImpl.newValidationError(SqlValidatorImpl.java:4753) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.handleUnresolvedFunction(SqlValidatorImpl.java:1699) > at org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:270) at > org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:215) at > org.apache.calcite.sql.fun.SqlCountAggFunction.deriveType(SqlCountAggFunction.java:83) > at > org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5477) > at > org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5464) > at org.apache.calcite.sql.SqlCall.accept(SqlCall.java:138) at > org.apache.calcite.sql.validate.SqlValidatorImpl.deriveTypeImpl(SqlValidatorImpl.java:1629) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.deriveType(SqlValidatorImpl.java:1614) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.expandSelectItem(SqlValidatorImpl.java:457) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelectList(SqlValidatorImpl.java:4017) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelect(SqlValidatorImpl.java:3280) > at > org.apache.calcite.sql.validate.SelectNamespace.validateImpl(SelectNamespace.java:60) > at > org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:84) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:967) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:943) > at org.apache.calcite.sql.SqlSelect.validate(SqlSelect.java:225) at > org.apache.calcite.sql.validate.SqlValidatorImpl.validateScopedExpression(SqlValidatorImpl.java:918) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.validate(SqlValidatorImpl.java:628) > at > org.apache.calcite.test.OptimizeTest.testSelectCountAll(OptimizeTest.java:220) > 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$1.runReflectiveCall(FrameworkMethod.java:50) > at > org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) > at > org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) > at > org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) > at > org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239) > at org.junit.rules.RunRules.evaluate(RunRules.java:20) 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: org.apache.calcite.sql.validate.SqlValidatorException: Invalid number of > arguments to function 'COUNT'. Was expecting 1 arguments at > sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at > sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) > at > sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) > at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at > org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:463) > at org.apache.calcite.runtime.Resources$ExInst.ex(Resources.java:572) ... 47 > more{code} > > After debugging, I found that the *main causes* of this exception are as > follows. > First, while converting RelNode to SqlNode, in the method > {{~^org.apache.calcite.rel.rel2sql.SqlImplementor.Context#toSql^~}} > [https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/rel/rel2sql/SqlImplementor.java#L869], > the operandList is empty because that there is with no argument in aggCall. > Second, while validating the result SqlNode, in the method > org.apache.calcite.sql.fun.SqlCountAggFunction#deriveType > [https://github.com/apache/calcite/blob/8327e674e7f0a768d124fa37fd75cda4b8a35bb6/core/src/main/java/org/apache/calcite/sql/fun/SqlCountAggFunction.java#L79], > the result of function call {{call.isCountStar() is false}}, because there is > no operand in {{call. While actually this is a count star call.}} > > *How to solve this problem?* > I think we can solve it either in the first or second step, but solving it in > the second step is more appropriate because SqlNode converted from RelNode > should be same with the result parsed from sql string possibly. > -- This message was sent by Atlassian Jira (v8.3.4#803005)