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https://issues.apache.org/jira/browse/CALCITE-2146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Vladimir Sitnikov resolved CALCITE-2146.
----------------------------------------
Resolution: Won't Fix
As per Julian Hyde: It was not designed to be thread-safe.
> Errant CyclicMetadataException in multithreaded context
> -------------------------------------------------------
>
> Key: CALCITE-2146
> URL: https://issues.apache.org/jira/browse/CALCITE-2146
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.15.0
> Reporter: Paul Jackson
> Assignee: Julian Hyde
> Priority: Major
>
> The code that protects against cyclic metadata is not thread-safe. A typical
> stack trace looks like:
> {{Caused by: org.apache.calcite.rel.metadata.CyclicMetadataException}}
> {{ at
> org.apache.calcite.rel.metadata.CyclicMetadataException.<clinit>(CyclicMetadataException.java:28)}}
> {{ at GeneratedMetadataHandler_Collation.collations(Unknown Source)}}
> {{ at GeneratedMetadataHandler_Collation.collations_$(Unknown Source)}}
> {{ at GeneratedMetadataHandler_Collation.collations(Unknown Source)}}
> {{ at
> org.apache.calcite.rel.metadata.RelMetadataQuery.collations(RelMetadataQuery.java:563)}}
> {{ at
> org.apache.calcite.rel.metadata.RelMdCollation.collations(RelMdCollation.java:117)}}
> {{ at GeneratedMetadataHandler_Collation.collations_$(Unknown Source)}}
> {{ at GeneratedMetadataHandler_Collation.collations(Unknown Source)}}
> {{ at GeneratedMetadataHandler_Collation.collations_$(Unknown Source)}}
> {{ at GeneratedMetadataHandler_Collation.collations(Unknown Source)}}
> {{ at
> org.apache.calcite.rel.metadata.RelMetadataQuery.collations(RelMetadataQuery.java:563)}}
> {{ at
> org.apache.calcite.rel.metadata.RelMdCollation.project(RelMdCollation.java:207)}}
> {{ at
> org.apache.calcite.rel.logical.LogicalProject$1.get(LogicalProject.java:117)}}
> {{ at
> org.apache.calcite.rel.logical.LogicalProject$1.get(LogicalProject.java:115)}}
> {{ at org.apache.calcite.plan.RelTraitSet.replaceIfs(RelTraitSet.java:238)}}
> {{ at
> org.apache.calcite.rel.logical.LogicalProject.create(LogicalProject.java:113)}}
> {{ at
> org.apache.calcite.rel.logical.LogicalProject.create(LogicalProject.java:103)}}
> {{ at
> org.apache.calcite.rel.core.RelFactories$ProjectFactoryImpl.createProject(RelFactories.java:127)}}
> {{ at org.apache.calcite.tools.RelBuilder.project(RelBuilder.java:1064)}}
> Generally, the use case that causes this is one where we have a set of SQL
> templates represented as RelNodes, which we use as a starting point for
> queries. If different threads operate on the same RelNode, they may work on
> the same cluster, and therefore the same RelMetadataQuery instance, which
> contains a map instance that is used to detect Cyclic Metadata.
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