vlsi edited a comment on issue #1839: [CALCITE-3836] The hash codes of RelNodes are unreliable URL: https://github.com/apache/calcite/pull/1839#issuecomment-595117753 > liyafan82: So the hash code of an object may change > Vladimir: This is false > liyafan82: Would you please give some docs/link/code proving this? @liyafan82 , would you please provide docs/link/code instead? Here's the javadoc for [Object#hashCode](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--) >Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method **_must consistently return the same integer_** It is sad your statement contradicts the very basic javadoc for `Object#hashCode`, and you ask others to prove something. It is you who should provide enough evidence to justify the bug exists. --- > liyafan82: So the hash code of an object may change Can you please provide a justification or a reproducible case instead? > liyafan82: Sorry. I do not understand why it violates the contract. Would you please elaborate more on this? Please check the javadoc for `Object#hashCode` and `#equals`. Please study https://jqno.nl/equalsverifier/ as well.
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