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  1. Spark
  2. SPARK-31312

Transforming Hive simple UDF (using JAR) expression may incur CNFE in later evaluation

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 2.4.5, 3.0.0
    • Fix Version/s: 2.4.6, 3.0.0
    • Component/s: SQL
    • Labels:
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      Description

      In SPARK-26560, we ensured that Hive UDF using JAR is executed regardless of current thread context classloader.

      Wenchen Fan pointed out another potential issue in post-review of SPARK-26560 - quoting the comment:

      Found a potential problem: here we call HiveSimpleUDF.dateType (which is a lazy val), to force to load the class with the corrected class loader.

      However, if the expression gets transformed later, which copies HiveSimpleUDF, then calling HiveSimpleUDF.dataType will re-trigger the class loading, and at that time there is no guarantee that the corrected classloader is used.

      I think we should materialize the loaded class in HiveSimpleUDF.

      This JIRA issue is to track the effort of verifying the potential issue and fixing the issue.

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            • Assignee:
              kabhwan Jungtaek Lim
              Reporter:
              kabhwan Jungtaek Lim

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                Updated:
                Resolved:

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