laurentgo opened a new pull request #1240: RelOptUtilTest concurrency fixup URL: https://github.com/apache/calcite/pull/1240 RelOptUtilTest was creating a static RelOptCluster which could be used during tests running in parallel to acces the associated RelMetadataQuery instance. Alas the object is not safe to access from multiple threads and in some occasions tests would fail with CyclicMetadataException. Fixing the test class by creating a new RelOptCluster/RelBuilder instance for each test, and removing the static instances.
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