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[jira] [Created] (CALCITE-2287) StackOverflowError from FlatList equals()


Zhong Yu created CALCITE-2287:
---------------------------------

             Summary: StackOverflowError from FlatList equals()
                 Key: CALCITE-2287
                 URL: https://issues.apache.org/jira/browse/CALCITE-2287
             Project: Calcite
          Issue Type: Bug
            Reporter: Zhong Yu
            Assignee: Julian Hyde


The equals() method of `Flat3List` and `Flat4List` may invoke each other in an infinite loop.

See also https://issues.apache.org/jira/browse/HIVE-18427

 

We found this problem when such lists are used as keys in `RelMetadataQuery.map`; occasionally there are hashcode collisions between `Flat3List` and `Flat4List`, hence their equals() methods will be invoked.



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