Jungtaek Lim created SPARK-31312:
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Summary: Transforming Hive simple UDF (using JAR) expression may
incur CNFE in later evaluation
Key: SPARK-31312
URL: https://issues.apache.org/jira/browse/SPARK-31312
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.4.5, 3.0.0, 3.1.0
Reporter: Jungtaek Lim
In SPARK-26560, we ensured that Hive UDF using JAR is executed regardless of
current thread context classloader.
[~cloud_fan] pointed out another potential issue in post-review of SPARK-26560
- quoting the comment:
{quote}
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.
{quote}
This JIRA issue is to track the effort of verifying the potential issue and
fixing the issue.
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