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https://issues.apache.org/jira/browse/CALCITE-5531?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde updated CALCITE-5531:
---------------------------------
Fix Version/s: 1.34.0
> COALESCE throws ClassCastException
> ----------------------------------
>
> Key: CALCITE-5531
> URL: https://issues.apache.org/jira/browse/CALCITE-5531
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.33.0
> Reporter: Maksim Zhuravkov
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.34.0
>
>
> A call to the COALESCE function throws ClassCastException. This is a
> regression caused by CALCITE-5424.
> After updating to calcite 1.33.0, I found that validation of the following
> query fails with a ClassCastException. Query:
> {code:java}
> SELECT COALESCE(DATE '2021-07-08', DATE '2020-01-01’)
> {code}
> Error:
> {code:java}
> org.apache.calcite.tools.ValidationException: java.lang.ClassCastException:
> class org.apache.calcite.sql.SqlLiteral cannot be cast to class
> org.apache.calcite.sql.SqlUnknownLiteral (org.apache.calcite.sql.SqlLiteral
> and org.apache.calcite.sql.SqlUnknownLiteral are in unnamed module of loader
> 'app')
> at org.apache.calcite.prepare.PlannerImpl.validate(PlannerImpl.java:226)
> at
> org.apache.calcite.rex.RexSqlStandardConvertletTableTest.convertSqlToRel(RexSqlStandardConvertletTableTest.java:101)
> at
> com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
> at
> com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
> at
> com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
> at
> com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)
> at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
> Caused by: java.lang.ClassCastException: class
> org.apache.calcite.sql.SqlLiteral cannot be cast to class
> org.apache.calcite.sql.SqlUnknownLiteral (org.apache.calcite.sql.SqlLiteral
> and org.apache.calcite.sql.SqlUnknownLiteral are in unnamed module of loader
> 'app')
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl.resolveLiteral(SqlValidatorImpl.java:6152)
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl$Expander.visit(SqlValidatorImpl.java:6617)
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl$Expander.visit(SqlValidatorImpl.java:6590)
> {code}
> When I move a commit pointer prior to the commit that introduces
> SqlUnknownLiteral, CALCITE-5424, the following test case passes successfully.
> The reproducer (added to RexSqlStandardConvertletTableTest):
>
> {code:java}
> @Test void testCoalesceWithUnknownLiteral() {
> final Project project = (Project) convertSqlToRel(
> "SELECT COALESCE(DATE '2021-07-08', DATE '2020-01-01')", false);
> final RexNode rex = project.getProjects().get(0);
> final RexToSqlNodeConverter rexToSqlNodeConverter =
> rexToSqlNodeConverter();
> final SqlNode convertedSql = rexToSqlNodeConverter.convertNode(rex);
> assertEquals(
> "CASE WHEN DATE '2021-07-08' IS NOT NULL THEN DATE '2021-07-08' ELSE
> DATE '2020-01-01' END",
> convertedSql.toString());
> }
> {code}
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