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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/06/08 16:45:00 UTC
[jira] [Commented] (SPARK-30993) GenerateUnsafeRowJoiner corrupts
the value if the datatype is UDF and its sql type has fixed length
[ https://issues.apache.org/jira/browse/SPARK-30993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17359461#comment-17359461 ]
Apache Spark commented on SPARK-30993:
--------------------------------------
User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/32824
> 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: 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.4.5, 3.0.0
> Reporter: Jungtaek Lim
> Assignee: Jungtaek Lim
> Priority: Major
> Labels: correctness
> Fix For: 2.4.6, 3.0.0
>
>
> 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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