[jira] [Created] (CALCITE-874) ReflectiveRelMetadataProvider is not thread-safe

["Julian Hyde (JIRA)" <ji...@apache.org>]

Julian Hyde created CALCITE-874:
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             Summary: ReflectiveRelMetadataProvider is not thread-safe
                 Key: CALCITE-874
                 URL: https://issues.apache.org/jira/browse/CALCITE-874
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde
            Assignee: Julian Hyde


There is a concurrency issue when a ReflectiveRelMetadataProvider is used from several queries simultaneously.

This most often shows up in CsvTest, which fails about 1 in 12 times. Several unit tests will simultaneously fail with a stack trace similar to this:{noformat}java.lang.AssertionError: Internal error: Error while applying rule EnumerableProjectRule, args [rel#40:LogicalProject.NONE.[](input=rel#38:Subset#1.NONE.[],JOINEDAT=$1,JOINTIME=$2,JOINTIMES=$3)]
        at org.apache.calcite.rel.AbstractRelNode.metadata(AbstractRelNode.java:272)
        at org.apache.calcite.rel.metadata.RelMetadataQuery.getNonCumulativeCost(RelMetadataQuery.java:114)
        at org.apache.calcite.plan.volcano.VolcanoPlanner.getCost(VolcanoPlanner.java:1111)
        at org.apache.calcite.plan.volcano.RelSubset.propagateCostImprovements0(RelSubset.java:363)
        at org.apache.calcite.plan.volcano.RelSubset.propagateCostImprovements(RelSubset.java:344)
        at org.apache.calcite.plan.volcano.VolcanoPlanner.addRelToSet(VolcanoPlanner.java:1826)
        at org.apache.calcite.plan.volcano.VolcanoPlanner.registerImpl(VolcanoPlanner.java:1759)
        at org.apache.calcite.plan.volcano.VolcanoPlanner.register(VolcanoPlanner.java:1016)
        at org.apache.calcite.plan.volcano.VolcanoPlanner.ensureRegistered(VolcanoPlanner.java:1036)
        at org.apache.calcite.plan.volcano.VolcanoPlanner.ensureRegistered(VolcanoPlanner.java:1939)
        at org.apache.calcite.plan.volcano.VolcanoRuleCall.transformTo(VolcanoRuleCall.java:138)
        at org.apache.calcite.plan.RelOptRuleCall.transformTo(RelOptRuleCall.java:213)
        at org.apache.calcite.rel.convert.ConverterRule.onMatch(ConverterRule.java:118)
        at org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:228)
        at org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp(VolcanoPlanner.java:807)
        at org.apache.calcite.tools.Programs$5.run(Programs.java:273)
        at org.apache.calcite.tools.Programs$SequenceProgram.run(Programs.java:321)
        at org.apache.calcite.prepare.Prepare.optimize(Prepare.java:144)
        at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:281)
        at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:189)
        at org.apache.calcite.prepare.CalcitePrepareImpl.prepare2_(CalcitePrepareImpl.java:698)
        at org.apache.calcite.prepare.CalcitePrepareImpl.prepare_(CalcitePrepareImpl.java:584)
        at org.apache.calcite.prepare.CalcitePrepareImpl.prepareSql(CalcitePrepareImpl.java:554)
        at org.apache.calcite.jdbc.CalciteConnectionImpl.parseQuery(CalciteConnectionImpl.java:207)
        at org.apache.calcite.jdbc.CalciteMetaImpl.prepareAndExecute(CalciteMetaImpl.java:563)
        at org.apache.calcite.avatica.AvaticaConnection.prepareAndExecuteInternal(AvaticaConnection.java:477)
        at org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:110)
        at org.apache.calcite.avatica.AvaticaStatement.executeQuery(AvaticaStatement.java:130)
        at org.apache.calcite.test.CsvTest.testDateType(CsvTest.java:368){noformat}



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