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[jira] [Created] (CALCITE-2429) NPE: SqlValidatorImpl.lookupFieldNamespace when SQL Advisor observes non-existing field


Vladimir Sitnikov created CALCITE-2429:
------------------------------------------

             Summary: NPE: SqlValidatorImpl.lookupFieldNamespace when SQL Advisor observes non-existing field
                 Key: CALCITE-2429
                 URL: https://issues.apache.org/jira/browse/CALCITE-2429
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.17.0
            Reporter: Vladimir Sitnikov
            Assignee: Julian Hyde


Test case (in JdbcTest):
{code:java}  @Test public void testSqlAdvisorNonExistingColumn()
      throws SQLException, ClassNotFoundException {
    adviseSql("select e.empid.^ from \"hr\".\"emps\" e",
        CalciteAssert.checkResultUnordered(
            "id=; names=null; type=MATCH",
            "id=hr.dependents; names=[hr, dependents]; type=TABLE",
            "id=hr.depts; names=[hr, depts]; type=TABLE",
            "id=hr.emps; names=[hr, emps]; type=TABLE",
            "id=hr.locations; names=[hr, locations]; type=TABLE",
            "id=hr; names=[hr]; type=SCHEMA"));
  }{code}

{code:java}
  SqlValidatorNamespace lookupFieldNamespace(RelDataType rowType, String name) {
    final SqlNameMatcher nameMatcher = catalogReader.nameMatcher();
    final RelDataTypeField field = nameMatcher.field(rowType, name);
    return new FieldNamespace(this, field.getType()); // <-- NPE
  }{code}

It looks like null-check for {{field}} resolves the exception and it suggests
{noformat}id=*; names=[*]; type=KEYWORD
id=; names=null; type=MATCH{noformat}

Original exception:
{noformat}java.sql.SQLException: exception while executing query: 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.AvaticaConnection.executeQueryInternal(AvaticaConnection.java:577)
at org.apache.calcite.avatica.AvaticaPreparedStatement.executeQuery(AvaticaPreparedStatement.java:137)
at org.apache.calcite.test.JdbcTest.adviseSql(JdbcTest.java:411)
at org.apache.calcite.test.JdbcTest.testSqlAdvisorNonExistingColumn(JdbcTest.java:344)
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}
{noformat}Caused by: java.lang.NullPointerException
at org.apache.calcite.sql.validate.SqlValidatorImpl.lookupFieldNamespace(SqlValidatorImpl.java:4835)
at org.apache.calcite.sql.validate.AbstractNamespace.lookupChild(AbstractNamespace.java:144)
at org.apache.calcite.sql.validate.IdentifierNamespace.lookupChild(IdentifierNamespace.java:42)
at org.apache.calcite.sql.validate.SqlValidatorImpl.lookupNameCompletionHints(SqlValidatorImpl.java:800)
at org.apache.calcite.sql.validate.SqlValidatorImpl.lookupSelectHints(SqlValidatorImpl.java:690)
at org.apache.calcite.sql.validate.SqlValidatorImpl.lookupSelectHints(SqlValidatorImpl.java:701)
at org.apache.calcite.sql.validate.SqlValidatorImpl.lookupHints(SqlValidatorImpl.java:655)
at org.apache.calcite.sql.advise.SqlAdvisor.getCompletionHints(SqlAdvisor.java:235)
at org.apache.calcite.sql.advise.SqlAdvisor.getCompletionHints0(SqlAdvisor.java:182)
at org.apache.calcite.sql.advise.SqlAdvisor.getCompletionHints(SqlAdvisor.java:142)
at org.apache.calcite.sql.advise.SqlAdvisorGetHintsFunction.getCompletionHints(SqlAdvisorGetHintsFunction.java:105)
at Baz.bind(Unknown Source)
at org.apache.calcite.jdbc.CalcitePrepare$CalciteSignature.enumerable(CalcitePrepare.java:356)
at org.apache.calcite.jdbc.CalciteConnectionImpl.enumerable(CalciteConnectionImpl.java:309)
at org.apache.calcite.jdbc.CalciteMetaImpl._createIterable(CalciteMetaImpl.java:506)
at org.apache.calcite.jdbc.CalciteMetaImpl.createIterable(CalciteMetaImpl.java:497)
at org.apache.calcite.avatica.AvaticaResultSet.execute(AvaticaResultSet.java:182)
at org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:64)
at org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:43)
at org.apache.calcite.avatica.AvaticaConnection.executeQueryInternal(AvaticaConnection.java:573)
... 25 more{noformat}



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