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https://issues.apache.org/jira/browse/CALCITE-3299?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Wang Weidong updated CALCITE-3299:
----------------------------------
Summary: Replace star identifier as select list of if no operands given
while in the method "createCall" (was: Handle validating exception for SqlNode
of select star converted by RelNode )
> Replace star identifier as select list of if no operands given while in the
> method "createCall"
> ------------------------------------------------------------------------------------------------
>
> Key: CALCITE-3299
> URL: https://issues.apache.org/jira/browse/CALCITE-3299
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.21.0
> Reporter: Wang Weidong
> Assignee: Wang Weidong
> Priority: Major
>
> h4. Procedure to reproduce the problem:
> - create table {{~^t^~}}
> - parse query ^{{~select * 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 testSelectAll() throws Exception {
> try (Statement s = parserContext.getStatement()) {
> s.execute("create table if not exists t (i int not null)");
> String sql = "select * 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.rel.rel2sql.SqlImplementor#wrapSelectorg.apache.calcite.rel.rel2sql.SqlImplementor#wrapSelectjava.lang.NullPointerException
> at org.apache.calcite.sql.validate.AggFinder.findAgg(AggFinder.java:58) at
> org.apache.calcite.sql.validate.SqlValidatorImpl.getAgg(SqlValidatorImpl.java:2774)
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl.getAggregate(SqlValidatorImpl.java:2761)
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl.isAggregate(SqlValidatorImpl.java:2720)
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl.registerQuery(SqlValidatorImpl.java:2406)
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl.registerQuery(SqlValidatorImpl.java:2326)
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl.validateScopedExpression(SqlValidatorImpl.java:916)
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl.validate(SqlValidatorImpl.java:628)
> at org.apache.calcite.test.OptimizeTest.testSelectAll(OptimizeTest.java:206)
> 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){code}
>
> After debugging, I found that the *main causes* of this exception are as
> follows.
> First, while converting RelNode to SqlNode, in the method
> {{~{color:#172b4d}^org.apache.calcite.rel.rel2sql.SqlImplementor#wrapSelect^{color}~}}
>
> [https://github.com/apache/calcite/blob/c3108bc1231b2aa4ba25227d225544fef4576508/core/src/main/java/org/apache/calcite/rel/rel2sql/SqlImplementor.java#L420],
> the selectList of SqlSelect instance was set to null.
> Second, while validating the result SqlNode, in the method
> {{org.apache.calcite.sql.validate.AggFinder#findAgg}}
>
> [https://github.com/apache/calcite/blob/c3108bc1231b2aa4ba25227d225544fef4576508/core/src/main/java/org/apache/calcite/sql/validate/AggFinder.java#L59]
> ,
> there is with no nullable checking.
>
> *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.
>
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