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https://issues.apache.org/jira/browse/SPARK-26878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-26878:
-----------------------------------
Assignee: Ala Luszczak
> 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: Ala Luszczak
> 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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