vlsi commented on issue #1839: [CALCITE-3836] The hash codes of RelNodes are unreliable URL: https://github.com/apache/calcite/pull/1839#issuecomment-592712216 TL;DR: it looks like currently there's no justification for the change :-/ I'm sorry to disappoint you, but > For many JVMs, the implementation is based on the object address in the memory This is false. > So the hash code of an object may change This is false. > This is consistent with the previous semantics, and solves the above problem. The new implementation violates `equal` and `hashCode` contract :-/
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