[jira] [Assigned] (SPARK-26878) QueryTest.compare does not handle maps with array keys correctly

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-26878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-26878:
------------------------------------

    Assignee: Apache Spark

> QueryTest.compare does not handle maps with array keys correctly
> ----------------------------------------------------------------
>
>                 Key: SPARK-26878
>                 URL: https://issues.apache.org/jira/browse/SPARK-26878
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL, Tests
>    Affects Versions: 2.4.0
>            Reporter: Ala Luszczak
>            Assignee: Apache Spark
>            Priority: Major
>
> The current strategy for comparing Maps is sorting the (key, value) tuples by _.toString, zipping tuples from both maps together, and then comparing tuples within each of the pairs separately.
> See: https://github.com/apache/spark/blob/ac9c0536bc518f173f2ff53bee42b7a89d28ee20/sql/core/src/test/scala/org/apache/spark/sql/QueryTest.scala#L344-L346
> This is not ideal for byte arrays. The string representations of byte arrays looks like “[B@7d263ddc” and has nothing to do with values actually contained within the array.
> Hence, if a map has byte array keys, then random values get compared with each other, which can result in false negatives.



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