[jira] [Created] (CALCITE-1817) Use of singleton CyclicMetadataException.INSTANCE hides original exception stack trace

["Remus Rusanu (JIRA)" <ji...@apache.org>]

Remus Rusanu created CALCITE-1817:
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             Summary: Use of singleton CyclicMetadataException.INSTANCE hides original exception stack trace
                 Key: CALCITE-1817
                 URL: https://issues.apache.org/jira/browse/CALCITE-1817
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: Remus Rusanu
            Assignee: Julian Hyde
            Priority: Minor


The JaninoRelMetadataProvider GeneratedMetadataHandler_XXX classes throw a singleton CyclicMetadataException instance to signal a cycle detection. this is for performance, as the exception is used in this context as flow control (exception is expected and ignored by {{RelMdColumnUniqueness.areColumnsUnique(RelSubset rel,...)}}.

But when the exception occurs in any other context (as I experienced in CALCITE-1816) it makes debugging problematic because the reported stack is one captured at some random initialization of the singleton in the past.



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