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https://issues.apache.org/jira/browse/SPARK-30993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim updated SPARK-30993:
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Affects Version/s: 2.3.4
2.4.5
> GenerateUnsafeRowJoiner corrupts the value if the datatype is UDF and its sql
> type has fixed length
> ---------------------------------------------------------------------------------------------------
>
> Key: SPARK-30993
> URL: https://issues.apache.org/jira/browse/SPARK-30993
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.4, 2.4.5, 3.0.0
> Reporter: Jungtaek Lim
> Priority: Major
>
> This is reported by user mailing list, though the mail thread is regarding
> suspect of the behavior of mapGroupsWithState.
> [https://lists.apache.org/thread.html/r08b44a7afac4e4c971633d30b4e5d11bd7c0d6e28180e03b874ea58b%40%3Cuser.spark.apache.org%3E]
> The actual culprit is, there're a couple of methods which don't handle UDT
> and it makes GenerateUnsafeRowJoiner to generate incorrect code.
> Specifically, the issue occurs when the sql type of UDT has fixed length -
> GenerateUnsafeRowJoiner has the logic to update the offset position for all
> variable-length data, and due to this bug, UDT field with fixed length is
> being treated as variable-length data and its value is modified.
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