vlsi edited a comment on issue #1875: [CALCITE-3873] Use global caching for ReflectiveVisitDispatcher implementation URL: https://github.com/apache/calcite/pull/1875#issuecomment-610846372 > it describes "Weak values will be garbage collected once they are weakly reachable. This makes them a poor candidate for caching; consider {@link #softValues} instead." The keys can still reference classes and retain them from the garbage collector.
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