Haoyan Geng created SPARK-56926:
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Summary: Guard against null messageParameters in Connect error
proto serialization
Key: SPARK-56926
URL: https://issues.apache.org/jira/browse/SPARK-56926
Project: Spark
Issue Type: Bug
Components: Connect
Affects Versions: 4.0.0, 5.0.0
Reporter: Haoyan Geng
In ErrorUtils.throwableToProtoErrors (Spark Connect server), the call
sparkThrowableBuilder.putAllMessageParameters(sparkThrowable.getMessageParameters)
is unguarded. If a SparkThrowable implementation returns null from
getMessageParameters() (violating the implicit non-null contract of the
interface's default), putAllMessageParameters(null) throws a
NullPointerException and crashes the FetchErrorDetails RPC.
When this happens, the client falls back to a degraded error reconstruction
that drops the cause chain, hiding the underlying error from the user.
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