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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2022/09/02 12:41:00 UTC

[jira] [Assigned] (SPARK-40315) Non-deterministic hashCode() calculations for ArrayBasedMapData on equal objects

     [ https://issues.apache.org/jira/browse/SPARK-40315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-40315:
------------------------------------

    Assignee:     (was: Apache Spark)

> Non-deterministic hashCode() calculations for ArrayBasedMapData on equal objects
> --------------------------------------------------------------------------------
>
>                 Key: SPARK-40315
>                 URL: https://issues.apache.org/jira/browse/SPARK-40315
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 3.2.2
>            Reporter: Carmen Kwan
>            Priority: Major
>
> There is no explicit `hashCode()` function override for the `ArrayBasedMapData` LogicalPlan. As a result, the `hashCode()` computed for `ArrayBasedMapData` can be different for two equal objects (objects with equal keys and values).
> This error is non-deterministic and hard to reproduce, as we don't control the default `hashCode()` function.
> We should override the `hashCode` function so that it works exactly as we expect. We should also have an explicit `equals()` function for consistency with how `Literals` check for equality of `ArrayBasedMapData`.



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