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From "Jungtaek Lim (Jira)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-30993) GenerateUnsafeRowJoiner corrupts the value if the datatype is UDF and its sql type has fixed length
Date Sun, 01 Mar 2020 03:24:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-30993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17048456#comment-17048456
] 

Jungtaek Lim commented on SPARK-30993:
--------------------------------------

Just confirmed the problem persists in branch-2.3 and branch-2.4. I guess the bug is ancient
one, as there has been no code change around the spot.

> 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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