hsyuan commented on issue #552: [CALCITE-2018] Queries failed with AssertionError: rel has lower cost… URL: https://github.com/apache/calcite/pull/552#issuecomment-536145120 But the stack trace is misleading if we reuse the exception instance. On the other hand, how much time will be wasted if we construct new `CyclicMetadataException` instance without reusing the singleton? I don't think it is significant.
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