hsyuan commented on issue #1839: [CALCITE-3836] The hash codes of RelNodes are unreliable URL: https://github.com/apache/calcite/pull/1839#issuecomment-593175950 If the rel node has the same id, that means it is the same object, since each rel has distinct id. So the default hashcode() serves its purpose. But I don't remember there is any place using RelNode as the hash map keys.
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